<?xml version="1.0" encoding="us-ascii" standalone="yes"?>
<!--Created by Computershare, Powered by IRIS Carbon-->
<xsd:schema xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:msex="http://www.middlesexwater.com/20151231" xmlns:dei="http://xbrl.sec.gov/dei/2014-01-31" xmlns:us-gaap="http://fasb.org/us-gaap/2015-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.middlesexwater.com/20151231">
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:type="simple" xlink:href="msex-20151231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="msex-20151231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="msex-20151231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="msex-20151231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:roleType roleURI="http://www.middlesexwater.com/role/DocumentAndEntityInformation" id="DocumentAndEntityInformation">
        <link:definition>001 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/ConsolidatedStatementsOfIncome" id="ConsolidatedStatementsOfIncome">
        <link:definition>002 - Statement - CONSOLIDATED STATEMENTS OF INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Statement-CONSOLIDATEDSTATEMENTSOFCASHFLOWS" id="Statement-CONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>004 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/ConsolidatedStatementsOfCashFlowsParenthetical" id="ConsolidatedStatementsOfCashFlowsParenthetical">
        <link:definition>005 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/ConsolidatedStatementsOfCapitalStockAndLong-TermDebt" id="ConsolidatedStatementsOfCapitalStockAndLong-TermDebt">
        <link:definition>006 - Statement - CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/ConsolidatedStatementsOfCapitalStockAndLong-TermDebtParenthetical" id="ConsolidatedStatementsOfCapitalStockAndLong-TermDebtParenthetical">
        <link:definition>007 - Statement - CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Statement-CONSOLIDATEDSTATEMENTSOFCOMMONSTOCKHOLDERSEQUITY" id="Statement-CONSOLIDATEDSTATEMENTSOFCOMMONSTOCKHOLDERSEQUITY">
        <link:definition>008 - Statement - CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Statement-CONSOLIDATEDSTATEMENTSOFCOMMONSTOCKHOLDERSEQUITYParenthetical" id="Statement-CONSOLIDATEDSTATEMENTSOFCOMMONSTOCKHOLDERSEQUITYParenthetical">
        <link:definition>009 - Statement - CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopments" id="OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopments">
        <link:definition>101 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/RateAndRegulatoryMatters" id="RateAndRegulatoryMatters">
        <link:definition>102 - Disclosure - Rate and Regulatory Matters</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/IncomeTaxes" id="IncomeTaxes">
        <link:definition>103 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/CommitmentsAndContingentLiabilities" id="CommitmentsAndContingentLiabilities">
        <link:definition>104 - Disclosure - Commitments and Contingent Liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Short-TermBorrowings" id="Short-TermBorrowings">
        <link:definition>105 - Disclosure - Short-term Borrowings</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Capitalization" id="Capitalization">
        <link:definition>106 - Disclosure - Capitalization</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/EmployeeBenefitPlans" id="EmployeeBenefitPlans">
        <link:definition>107 - Disclosure - Employee Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/BusinessSegmentData" id="BusinessSegmentData">
        <link:definition>108 - Disclosure - Business Segment Data</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/QuarterlyOperatingResults-Unaudited" id="QuarterlyOperatingResults-Unaudited">
        <link:definition>109 - Disclosure - Quarterly Operating Results - Unaudited</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsPolicies" id="OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsPolicies">
        <link:definition>201 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsTables" id="OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsTables">
        <link:definition>301 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/RateAndRegulatoryMattersTables" id="RateAndRegulatoryMattersTables">
        <link:definition>302 - Disclosure - Rate and Regulatory Matters (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/IncomeTaxesTables" id="IncomeTaxesTables">
        <link:definition>303 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/CommitmentsAndContingentLiabilitiesTables" id="CommitmentsAndContingentLiabilitiesTables">
        <link:definition>304 - Disclosure - Commitments and Contingent Liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/ShortTermBorrowingsTables" id="ShortTermBorrowingsTables">
        <link:definition>305 - Disclosure - Short Term Borrowings (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/CapitalizationTables" id="CapitalizationTables">
        <link:definition>306 - Disclosure - Capitalization (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/EmployeeBenefitPlansTables" id="EmployeeBenefitPlansTables">
        <link:definition>307 - Disclosure - Employee Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/BusinessSegmentDataTables" id="BusinessSegmentDataTables">
        <link:definition>308 - Disclosure - Business Segment Data (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/QuarterlyOperatingResults-UnauditedTables" id="QuarterlyOperatingResults-UnauditedTables">
        <link:definition>309 - Disclosure - Quarterly Operating Results - Unaudited (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-OrganizationSummaryofSignificantAccountingPoliciesandRecentDevelopmentsNarrativeDetails" id="Disclosure-OrganizationSummaryofSignificantAccountingPoliciesandRecentDevelopmentsNarrativeDetails">
        <link:definition>40101 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-OrganizationSummaryofSignificantAccountingPoliciesandRecentDevelopmentsScheduleofDepreciationRatesDetails" id="Disclosure-OrganizationSummaryofSignificantAccountingPoliciesandRecentDevelopmentsScheduleofDepreciationRatesDetails">
        <link:definition>40102 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Schedule of Depreciation Rates) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-OrganizationSummaryofSignificantAccountingPoliciesandRecentDevelopmentsScheduleofAFUDCRatesDetails" id="Disclosure-OrganizationSummaryofSignificantAccountingPoliciesandRecentDevelopmentsScheduleofAFUDCRatesDetails">
        <link:definition>40103 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Schedule of AFUDC Rates) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-RateandRegulatoryMattersNarrativeDetails" id="Disclosure-RateandRegulatoryMattersNarrativeDetails">
        <link:definition>40201 - Disclosure - Rate and Regulatory Matters (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-RateandRegulatoryMattersScheduleofRegulatoryAssetsDetails" id="Disclosure-RateandRegulatoryMattersScheduleofRegulatoryAssetsDetails">
        <link:definition>40202 - Disclosure - Rate and Regulatory Matters (Schedule of Regulatory Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-IncomeTaxesScheduleofIncomeTaxExpenseReconciliationDetails" id="Disclosure-IncomeTaxesScheduleofIncomeTaxExpenseReconciliationDetails">
        <link:definition>40301 - Disclosure - Income Taxes (Schedule of Income Tax Expense Reconciliation) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-IncomeTaxesScheduleofIncomeTaxExpenseDetails" id="Disclosure-IncomeTaxesScheduleofIncomeTaxExpenseDetails">
        <link:definition>40302 - Disclosure - Income Taxes (Schedule of Income Tax Expense) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-IncomeTaxesScheduleofNetDeferredTaxLiabilityDetails" id="Disclosure-IncomeTaxesScheduleofNetDeferredTaxLiabilityDetails">
        <link:definition>40303 - Disclosure - Income Taxes (Schedule of Net Deferred Tax Liability) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-CommitmentsandContingentLiabilitiesNarrativeDetails" id="Disclosure-CommitmentsandContingentLiabilitiesNarrativeDetails">
        <link:definition>40401 - Disclosure - Commitments and Contingent Liabilities (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-CommitmentsandContingentLiabilitiesScheduleofPurchasedWaterCostsDetails" id="Disclosure-CommitmentsandContingentLiabilitiesScheduleofPurchasedWaterCostsDetails">
        <link:definition>40402 - Disclosure - Commitments and Contingent Liabilities (Schedule of Purchased Water Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-ShortTermBorrowingsDetails" id="Disclosure-ShortTermBorrowingsDetails">
        <link:definition>40501 - Disclosure - Short Term Borrowings (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-CapitalizationNarrativeDetails" id="Disclosure-CapitalizationNarrativeDetails">
        <link:definition>40601 - Disclosure - Capitalization (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-CapitalizationScheduleofMaturitiesofLong-termDebtDetails" id="Disclosure-CapitalizationScheduleofMaturitiesofLong-termDebtDetails">
        <link:definition>40602 - Disclosure - Capitalization (Schedule of Maturities of Long-term Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-CapitalizationScheduleofEarningsPerShareDetails" id="Disclosure-CapitalizationScheduleofEarningsPerShareDetails">
        <link:definition>40603 - Disclosure - Capitalization (Schedule of Earnings Per Share) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-CapitalizationScheduleofCarryingAmountandFairValueofBondsDetails" id="Disclosure-CapitalizationScheduleofCarryingAmountandFairValueofBondsDetails">
        <link:definition>40604 - Disclosure - Capitalization (Schedule of Carrying Amount and Fair Value of Bonds) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansNarrativeDetails" id="Disclosure-EmployeeBenefitPlansNarrativeDetails">
        <link:definition>40701 - Disclosure - Employee Benefit Plans (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofChangeinProjectedBenefitObligationDetails" id="Disclosure-EmployeeBenefitPlansScheduleofChangeinProjectedBenefitObligationDetails">
        <link:definition>40702 - Disclosure - Employee Benefit Plans (Schedule of Change in Projected Benefit Obligation) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofChangeinFairValueofPlanAssetsDetails" id="Disclosure-EmployeeBenefitPlansScheduleofChangeinFairValueofPlanAssetsDetails">
        <link:definition>40703 - Disclosure - Employee Benefit Plans (Schedule of Change in Fair Value of Plan Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofEmployeeBenefitPlansRecognizedinBalanceSheetDetails" id="Disclosure-EmployeeBenefitPlansScheduleofEmployeeBenefitPlansRecognizedinBalanceSheetDetails">
        <link:definition>40704 - Disclosure - Employee Benefit Plans (Schedule of Employee Benefit Plans Recognized in Balance Sheet) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofPeriodicCostsForEmployeeRetirementBenefitPlansDetails" id="Disclosure-EmployeeBenefitPlansScheduleofPeriodicCostsForEmployeeRetirementBenefitPlansDetails">
        <link:definition>40705 - Disclosure - Employee Benefit Plans (Schedule of Periodic Costs For Employee Retirement Benefit Plans) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofAmountsExpectedtobeAmortizedfromRegulatoryAssetstoNetPeriodicBenefitCostDetails" id="Disclosure-EmployeeBenefitPlansScheduleofAmountsExpectedtobeAmortizedfromRegulatoryAssetstoNetPeriodicBenefitCostDetails">
        <link:definition>40706 - Disclosure - Employee Benefit Plans (Schedule of Amounts Expected to be Amortized from Regulatory Assets to Net Periodic Benefit Cost) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofDiscountandCompensationRatesDetails" id="Disclosure-EmployeeBenefitPlansScheduleofDiscountandCompensationRatesDetails">
        <link:definition>40707 - Disclosure - Employee Benefit Plans (Schedule of Discount and Compensation Rates) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofEffectofOne-percentagePointChangeinAssumedHealthCareCostTrendRatesDetails" id="Disclosure-EmployeeBenefitPlansScheduleofEffectofOne-percentagePointChangeinAssumedHealthCareCostTrendRatesDetails">
        <link:definition>40708 - Disclosure - Employee Benefit Plans (Schedule of Effect of One-percentage Point Change in Assumed Health Care Cost Trend Rates) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofExpectedBenefitPaymentsDetails" id="Disclosure-EmployeeBenefitPlansScheduleofExpectedBenefitPaymentsDetails">
        <link:definition>40709 - Disclosure - Employee Benefit Plans (Schedule of Expected Benefit Payments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofAllocationofPlanAssetsDetails" id="Disclosure-EmployeeBenefitPlansScheduleofAllocationofPlanAssetsDetails">
        <link:definition>40710 - Disclosure - Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofFairValueofPensionPlanAssetsDetails" id="Disclosure-EmployeeBenefitPlansScheduleofFairValueofPensionPlanAssetsDetails">
        <link:definition>40711 - Disclosure - Employee Benefit Plans (Schedule of Fair Value of Pension Plan Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofFairValueofOtherBenefitsPlanAssetsDetails" id="Disclosure-EmployeeBenefitPlansScheduleofFairValueofOtherBenefitsPlanAssetsDetails">
        <link:definition>40712 - Disclosure - Employee Benefit Plans (Schedule of Fair Value of Other Benefits Plan Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-EmployeeBenefitPlansScheduleofRestrictedStockPlanDetails" id="Disclosure-EmployeeBenefitPlansScheduleofRestrictedStockPlanDetails">
        <link:definition>40713 - Disclosure - Employee Benefit Plans (Schedule of Restricted Stock Plan) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-BusinessSegmentDataDetails" id="Disclosure-BusinessSegmentDataDetails">
        <link:definition>40801 - Disclosure - Business Segment Data (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/QuarterlyOperatingResults-UnauditedDetails" id="QuarterlyOperatingResults-UnauditedDetails">
        <link:definition>40901 - Disclosure - Quarterly Operating Results - Unaudited (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Statement-CONSOLIDATEDBALANCESHEETS" id="Statement-CONSOLIDATEDBALANCESHEETS">
        <link:definition>003 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.middlesexwater.com/role/Disclosure-IncomeTaxesNarrativeDetails" id="Disclosure-IncomeTaxesNarrativeDetails">
        <link:definition>40304 - Disclosure - Income Taxes (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2006/ref" schemaLocation="http://www.xbrl.org/2006/ref-2006-02-27.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/XLink" schemaLocation="http://www.xbrl.org/2003/xl-2003-12-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2015-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd" />
  <xsd:element name="NonUtilityAssetsNet" id="msex_NonUtilityAssetsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="TotalCommonEquity" id="msex_TotalCommonEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="RangeOfDepreciationRatesTableTextBlock" id="msex_RangeOfDepreciationRatesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="OperationsAndMaintenance" id="msex_OperationsAndMaintenance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ConvertiblePreferredStockSeries7Member" id="msex_ConvertiblePreferredStockSeries7Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="ConvertiblePreferredStockSeries8Member" id="msex_ConvertiblePreferredStockSeries8Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="NonredeemablePreferredStockSeries7Member" id="msex_NonredeemablePreferredStockSeries7Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MiddlesexWaterCompanyMember" id="msex_MiddlesexWaterCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="TidewaterUtilitiesIncMember" id="msex_TidewaterUtilitiesIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="TidewaterEnvironmentalServicesMember" id="msex_TidewaterEnvironmentalServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PinelandsCompanyMember" id="msex_PinelandsCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PinelandsWastewaterMember" id="msex_PinelandsWastewaterMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SouthernShoresMember" id="msex_SouthernShoresMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="TwinLakesMember" id="msex_TwinLakesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="NewJerseyEconomicDevelopmentAuthorityMember" id="msex_NewJerseyEconomicDevelopmentAuthorityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="NewJerseyEnvironmentalInfrastructureTrustMember" id="msex_NewJerseyEnvironmentalInfrastructureTrustMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="DelawareStateRevolvingFundMember" id="msex_DelawareStateRevolvingFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxesMember" id="msex_IncomeTaxesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="RateCasesStormCostsTankPaintingOtherMember" id="msex_RateCasesStormCostsTankPaintingOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FairValueInputsTotalMember" id="msex_FairValueInputsTotalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsMidCapGrowthMember" id="msex_MutualFundsMidCapGrowthMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsMidCapValueMember" id="msex_MutualFundsMidCapValueMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsForeignSmallMidGrowthMember" id="msex_MutualFundsForeignSmallMidGrowthMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsForeignLargeCoreMember" id="msex_MutualFundsForeignLargeCoreMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsForeignLargeBlendMember" id="msex_MutualFundsForeignLargeBlendMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsPacificAsiaexJapanStockMember" id="msex_MutualFundsPacificAsiaexJapanStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsDiversifiedEmergingMarketsMember" id="msex_MutualFundsDiversifiedEmergingMarketsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsPreferredStockIndexMember" id="msex_MutualFundsPreferredStockIndexMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MoneyMarketFundsCashCashEquivalentsMember" id="msex_MoneyMarketFundsCashCashEquivalentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesNonFinancialServicesMember" id="msex_EquitySecuritiesNonFinancialServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesFinancialServicesMember" id="msex_EquitySecuritiesFinancialServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesUtilitiesMember" id="msex_EquitySecuritiesUtilitiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesConsumerGrowthMember" id="msex_EquitySecuritiesConsumerGrowthMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesConsumerStaplesMember" id="msex_EquitySecuritiesConsumerStaplesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesConsumerCyclicalsMember" id="msex_EquitySecuritiesConsumerCyclicalsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesIndustrialResourcesMember" id="msex_EquitySecuritiesIndustrialResourcesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesCapitalEquipmentMember" id="msex_EquitySecuritiesCapitalEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesTechnologyMember" id="msex_EquitySecuritiesTechnologyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EquitySecuritiesEnergyMember" id="msex_EquitySecuritiesEnergyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="AgencyUsStateMunicipalDebtMember" id="msex_AgencyUsStateMunicipalDebtMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="CommoditiesMember" id="msex_CommoditiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsSmallCapCoreMember" id="msex_MutualFundsSmallCapCoreMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsMidCapCoreMember" id="msex_MutualFundsMidCapCoreMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsLargeCapCoreMember" id="msex_MutualFundsLargeCapCoreMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsForeignLargeGrowthMember" id="msex_MutualFundsForeignLargeGrowthMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="OutsideDirectorStockCompensationPlanMember" id="msex_OutsideDirectorStockCompensationPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SourceOfSupplyMember" id="msex_SourceOfSupplyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PumpingMember" id="msex_PumpingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="WaterTreatmentMember" id="msex_WaterTreatmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="GeneralPlantMember" id="msex_GeneralPlantMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="TDMainsMember" id="msex_TDMainsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="TDServicesMember" id="msex_TDServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="TDOtherMember" id="msex_TDOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="DdMember" id="msex_DdMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="QqMember" id="msex_QqMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="QqRrSsMember" id="msex_QqRrSsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="NewJerseyStateRevolvingFundMember" id="msex_NewJerseyStateRevolvingFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="DividendReinvestmentCommonStockPurchasePlanMember" id="msex_DividendReinvestmentCommonStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="ConvertiblePreferredStock1Member" id="msex_ConvertiblePreferredStock1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="NonredeemablePreferredStock1Member" id="msex_NonredeemablePreferredStock1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebt1Member" id="msex_SecuredDebt1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebt2Member" id="msex_SecuredDebt2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebt3Member" id="msex_SecuredDebt3Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNoteMember" id="msex_StateRevolvingTrustNoteMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote1Member" id="msex_StateRevolvingTrustNote1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote2Member" id="msex_StateRevolvingTrustNote2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote3Member" id="msex_StateRevolvingTrustNote3Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustBondMember" id="msex_StateRevolvingTrustBondMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustBond1Member" id="msex_StateRevolvingTrustBond1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote4Member" id="msex_StateRevolvingTrustNote4Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote5Member" id="msex_StateRevolvingTrustNote5Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote6Member" id="msex_StateRevolvingTrustNote6Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebt4Member" id="msex_SecuredDebt4Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebt5Member" id="msex_SecuredDebt5Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebt6Member" id="msex_SecuredDebt6Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote7Member" id="msex_StateRevolvingTrustNote7Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote8Member" id="msex_StateRevolvingTrustNote8Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage1Member" id="msex_FirstMortgage1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage2Member" id="msex_FirstMortgage2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage3Member" id="msex_FirstMortgage3Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage4Member" id="msex_FirstMortgage4Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage5Member" id="msex_FirstMortgage5Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage7Member" id="msex_FirstMortgage7Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage8Member" id="msex_FirstMortgage8Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage10Member" id="msex_FirstMortgage10Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage12Member" id="msex_FirstMortgage12Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage14Member" id="msex_FirstMortgage14Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage16Member" id="msex_FirstMortgage16Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage18Member" id="msex_FirstMortgage18Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage20Member" id="msex_FirstMortgage20Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage21Member" id="msex_FirstMortgage21Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage22Member" id="msex_FirstMortgage22Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage23Member" id="msex_FirstMortgage23Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage6Member" id="msex_FirstMortgage6Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage9Member" id="msex_FirstMortgage9Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage11Member" id="msex_FirstMortgage11Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage13Member" id="msex_FirstMortgage13Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage15Member" id="msex_FirstMortgage15Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage17Member" id="msex_FirstMortgage17Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage19Member" id="msex_FirstMortgage19Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage24Member" id="msex_FirstMortgage24Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="StateRevolvingTrustNote9Member" id="msex_StateRevolvingTrustNote9Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsSmallCapValueMember" id="msex_MutualFundsSmallCapValueMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsIntermediateTermBondMember" id="msex_MutualFundsIntermediateTermBondMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsRealAssetMember" id="msex_MutualFundsRealAssetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsForeignLargeValueMember" id="msex_MutualFundsForeignLargeValueMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsRealEstateIndexMember" id="msex_MutualFundsRealEstateIndexMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="DoverAirForceBaseMember" id="msex_DoverAirForceBaseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="DocumentAndEntityInformationAbstract" id="msex_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="EntityClosingMarketPricePerShare" id="msex_EntityClosingMarketPricePerShare" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xsd:element name="PremiumOnLongtermDebt" id="msex_PremiumOnLongtermDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeobligatedPrincipalPayments" id="msex_DeobligatedPrincipalPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CashPaidDuringYearForAbstract" id="msex_CashPaidDuringYearForAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="StatementConsolidatedStatementsOfCapitalStockAndLongtermDebtAbstract" id="msex_StatementConsolidatedStatementsOfCapitalStockAndLongtermDebtAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfConvertiblePreferredStock" id="msex_ConversionOfConvertiblePreferredStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfConvertiblePreferredStockShares" id="msex_ConversionOfConvertiblePreferredStockShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfConvertiblePreferredStockValuePerShare" id="msex_ConversionOfConvertiblePreferredStockValuePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsAbstract" id="msex_OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalizationTextBlock" id="msex_CapitalizationTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="SystemOfAccountsPolicyTextBlock" id="msex_SystemOfAccountsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PreliminarySurveyAndInvestigationPsiCostsPolicyTextBlock" id="msex_PreliminarySurveyAndInvestigationPsiCostsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="CustomersAdvancesForConstructionCacPolicyTextBlock" id="msex_CustomersAdvancesForConstructionCacPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="AllowanceForFundsUsedDuringConstructionRatesTableTextBlock" id="msex_AllowanceForFundsUsedDuringConstructionRatesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="AmountsExpectedToBeAmortizedFromRegulatoryAssetsTableTextBlock" id="msex_AmountsExpectedToBeAmortizedFromRegulatoryAssetsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="AllocationOfPlanAssetsTableTextBlock" id="msex_AllocationOfPlanAssetsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PercentVotingInterest" id="msex_PercentVotingInterest" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PercentOfOperatingRevenues" id="msex_PercentOfOperatingRevenues" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PercentOfTotalAssets" id="msex_PercentOfTotalAssets" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="DecreaseInPensionAndOtherPostretirementDefinedBenefitPlansLiabilities" id="msex_DecreaseInPensionAndOtherPostretirementDefinedBenefitPlansLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="TermOfAgreement" id="msex_TermOfAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="BaseRateIncrease" id="msex_BaseRateIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseInBaseRatesRevenuePerYearPercent" id="msex_IncreaseInBaseRatesRevenuePerYearPercent" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="OriginallyFiledBaseWaterRateIncrease" id="msex_OriginallyFiledBaseWaterRateIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RateBase" id="msex_RateBase" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="InterimRates" id="msex_InterimRates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCustomers" id="msex_NumberOfCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="DsicRateIncrease" id="msex_DsicRateIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="MaximumAnnualRevenuesAllowedUnderFoundationalFiling" id="msex_MaximumAnnualRevenuesAllowedUnderFoundationalFiling" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionPremiums" id="msex_AcquisitionPremiums" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="PurchaseOfWastewaterUtilityAssets" id="msex_PurchaseOfWastewaterUtilityAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SuperstormSandyRelatedCosts" id="msex_SuperstormSandyRelatedCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InitialPaymentReceivedFromInsuranceClaim" id="msex_InitialPaymentReceivedFromInsuranceClaim" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RemainingRecoveryPeriod" id="msex_RemainingRecoveryPeriod" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="TaxEffectOfAbstract" id="msex_TaxEffectOfAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeeBenefits" id="msex_EmployeeBenefits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CurrentAbstract" id="msex_CurrentAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredAbstract" id="msex_DeferredAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredTaxLiabilitiesUtilityPlantRelated" id="msex_DeferredTaxLiabilitiesUtilityPlantRelated" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="DeferredTaxAssetsCustomerAdvances" id="msex_DeferredTaxAssetsCustomerAdvances" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredTaxLiabilitiesInvestmentTaxCredits" id="msex_DeferredTaxLiabilitiesInvestmentTaxCredits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="MinimumTreatedWaterPurchaseCommitment" id="msex_MinimumTreatedWaterPurchaseCommitment" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="BudgetedConstructionCost" id="msex_BudgetedConstructionCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BudgetedConstructionCostForConstructionProgramYearOne" id="msex_BudgetedConstructionCostForConstructionProgramYearOne" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BudgetedConstructionCostForConstructionProgramYearTwo" id="msex_BudgetedConstructionCostForConstructionProgramYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CostOfPurchasedWaterAbstract" id="msex_CostOfPurchasedWaterAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="CostOfTreatedWater" id="msex_CostOfTreatedWater" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CostOfUntreatedWater" id="msex_CostOfUntreatedWater" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DividendReinvestmenPlanSharesIssuedCumulative" id="msex_DividendReinvestmenPlanSharesIssuedCumulative" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfStockThatMayBeRedeemedInGivenCalanderYear" id="msex_PercentageOfStockThatMayBeRedeemedInGivenCalanderYear" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xsd:element name="ConvertibleDollar7PreferredSeriesStockDividends" id="msex_ConvertibleDollar7PreferredSeriesStockDividends" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ConvertibleDollar8PreferredSeriesStockDividends" id="msex_ConvertibleDollar8PreferredSeriesStockDividends" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock" id="msex_IncrementalCommonSharesAttributableToConversionOfDollar7PreferredSeriesStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock" id="msex_IncrementalCommonSharesAttributableToConversionOfDollar8PreferredSeriesStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgageBondsFairValueDisclosure" id="msex_FirstMortgageBondsFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="StateRevolvingNotesFairValueDisclosure" id="msex_StateRevolvingNotesFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsOneToThree" id="msex_IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsOneToThree" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsFourAndFive" id="msex_IncreaseDecreaseInAnnualRatePerCapitaCostOfCoveredHealthcareBenefitsYearsFourAndFive" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="CommonStockInPlanValue" id="msex_CommonStockInPlanValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfHoursRequiredToParticipateInContributionPlan" id="msex_NumberOfHoursRequiredToParticipateInContributionPlan" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PercentOfParticipantsContributionsMatchedByCompanyBelowOnePercentOfParticipantsCompensation" id="msex_PercentOfParticipantsContributionsMatchedByCompanyBelowOnePercentOfParticipantsCompensation" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PercentOfParticipantsContributionsMatchedByCompanyAboveOnePercentOfParticipantsCompensation" id="msex_PercentOfParticipantsContributionsMatchedByCompanyAboveOnePercentOfParticipantsCompensation" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="ThresholdPercentageOfParticipantsCompensationAtWhichMatchingDecreases" id="msex_ThresholdPercentageOfParticipantsCompensationAtWhichMatchingDecreases" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="MatchingContributions" id="msex_MatchingContributions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DefinedContributionPlanEmployerDiscretionaryContributionPercent" id="msex_DefinedContributionPlanEmployerDiscretionaryContributionPercent" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="EscrowAccountMaintainedFor2008RestrictedStockPlan" id="msex_EscrowAccountMaintainedFor2008RestrictedStockPlan" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="ChangeInProjectedBenefitObligationAbstract" id="msex_ChangeInProjectedBenefitObligationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="ChangeInFairValueOfPlanAssetsAbstract" id="msex_ChangeInFairValueOfPlanAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="ExpectedAmortizedActuarialLoss" id="msex_ExpectedAmortizedActuarialLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ExpectedAmortizedPriorServiceCredit" id="msex_ExpectedAmortizedPriorServiceCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageAssumptionsAbstract" id="msex_WeightedAverageAssumptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="DiscountRateForAbstract" id="msex_DiscountRateForAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="CompensationIncreaseForAbstract" id="msex_CompensationIncreaseForAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="BenefitPaymentsTotals" id="msex_BenefitPaymentsTotals" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="UnearnedCompensationAbstract" id="msex_UnearnedCompensationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateValueUnearnedCompensation" id="msex_ShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateValueUnearnedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="GrantedUnearnedCompensation" id="msex_GrantedUnearnedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ForfeitedUnearnedCompensation" id="msex_ForfeitedUnearnedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AmortizationOfCompensationExpenseUnearnedCompensation" id="msex_AmortizationOfCompensationExpenseUnearnedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DeferredChargesAndOtherAssetsAbstract" id="msex_DeferredChargesAndOtherAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="OperationsContractsDeveloperAndOtherReceivables" id="msex_OperationsContractsDeveloperAndOtherReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredChargesAndOtherAssets" id="msex_DeferredChargesAndOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DistributionsFromInvestmentInJointVenture" id="msex_DistributionsFromInvestmentInJointVenture" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage25Member" id="msex_FirstMortgage25Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="FirstMortgage26Member" id="msex_FirstMortgage26Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebt7Member" id="msex_SecuredDebt7Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="NewJerseyBoardOfPublicUtilitiesMember" id="msex_NewJerseyBoardOfPublicUtilitiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="DelawarePublicServiceCommissionMember" id="msex_DelawarePublicServiceCommissionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsTable" id="msex_OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsLineItems" id="msex_OrganizationSummaryOfSignificantAccountingPoliciesAndRecentDevelopmentsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="BaseRateAmount" id="msex_BaseRateAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReimbursementsReceivedForPreliminarySurveyAndInvestigationCosts" id="msex_ReimbursementsReceivedForPreliminarySurveyAndInvestigationCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ProjectedAnnualRevenue" id="msex_ProjectedAnnualRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PennsylvaniaPublicUtilitiesCommissionMember" id="msex_PennsylvaniaPublicUtilitiesCommissionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="CommitmentAndContingenciesLineItems" id="msex_CommitmentAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="CommitmentAndContingenciesTable" id="msex_CommitmentAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="PurchaseCommitment1Member" id="msex_PurchaseCommitment1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="LongtermPurchaseCommitmentExpirationDate" id="msex_LongtermPurchaseCommitmentExpirationDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PurchaseCommitment2Member" id="msex_PurchaseCommitment2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsLargeCapBlendMember" id="msex_MutualFundsLargeCapBlendMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsWorldBondMember" id="msex_MutualFundsWorldBondMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="MutualFundsSmallCapGrowthMember" id="msex_MutualFundsSmallCapGrowthMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="PreferredEquitySecuritiesMember" id="msex_PreferredEquitySecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="VestedUnearnedCompensation" id="msex_VestedUnearnedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RecentDevelopmentsPolicyTextBlock" id="msex_RecentDevelopmentsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xsd:element name="PinelandsWaterAndPinelandsWastewaterMember" id="msex_PinelandsWaterAndPinelandsWastewaterMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xsd:element name="ReserveAgainstTangiblePropertyDeductions" id="msex_ReserveAgainstTangiblePropertyDeductions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AdditionalSharesAuthorizedBySECToBeIssued" id="msex_AdditionalSharesAuthorizedBySECToBeIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
</xsd:schema>
