<SUBMISSION>
<ACCESSION-NUMBER>0001290041-07-000058
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20071115
<FILING-DATE>20071115
<DATE-OF-FILING-DATE-CHANGE>20071115
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>WATTS WATER TECHNOLOGIES INC
<CIK>0000795403
<ASSIGNED-SIC>3490
<IRS-NUMBER>042916536
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>815 CHESTNUT ST
<CITY>NORTH ANDOVER
<STATE>MA
<ZIP>01845
<PHONE>9786881811
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>815 CHESTNUT STREET
<CITY>NORTH ANDOVER
<STATE>MA
<ZIP>01845
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>WATTS INDUSTRIES INC
<DATE-CHANGED>19920703
</FORMER-COMPANY>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>HORNE TIMOTHY P
<CIK>0001235976
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-11499
<FILM-NUMBER>071248327
</FILING-VALUES>
<BUSINESS-ADDRESS>
<PHONE>9786881811
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>WATTS INDUSTRIES INC
<STREET2>ROUTE 815 CHESTNUT ST
<CITY>NORTH ANDOVER
<STATE>MA
<ZIP>01845
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-11-15</periodOfReport>

    <issuer>
        <issuerCik>0000795403</issuerCik>
        <issuerName>WATTS WATER TECHNOLOGIES INC</issuerName>
        <issuerTradingSymbol>WTS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001235976</rptOwnerCik>
            <rptOwnerName>HORNE TIMOTHY P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O WATTS WATER TECHNOLOGIES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>815 CHESTNUT STREET</rptOwnerStreet2>
            <rptOwnerCity>NORTH ANDOVER</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01845</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-11-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>W</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>62680</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>62680</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2204390</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5019490</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5019490</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Shares of Class B Common Stock are convertible into shares of Class A Common Stock on a 1-for-1 basis.</footnote>
        <footnote id="F2">All shares of Class B Common Stock were convertible into Class A Common Stock upon issuance and do not have an expiration date.</footnote>
        <footnote id="F3">Consists of the following shares of Class B Common Stock: (i) 1,666,970 shares held for the benefit of Daniel W. Horne under a trust for which the Reporting Person serves as trustee, (ii) 1,666,970 shares held for the benefit of Deborah Horne under a trust for which the Reporting Person serves as trustee, (iii) 1,495,010 shares held for the benefit of Peter W. Horne under a trust, which are subject to The Amended and Restated George B. Horne Voting Trust Agreement - 1997 (the &quot;1997 Voting Trust&quot;) for which the Reporting Person serves as trustee, (iv) 20,200 and 22,600 shares held for the benefit of Tara V. Horne and Tiffany R. Horne, respectively, under irrevocable trusts for which the Reporting Person serves as trustee, and (v) 147,740 shares held for the benefit of Tiffany R. Horne under a trust, which are subject to the 1997 Voting Trust.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Kenneth R. Lepage - Attorney-in-Fact</signatureName>
        <signatureDate>2007-11-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
