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Accounting Policies, by Policy (Policies)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Regulatory Notice of Non-Compliance	Regulatory Notice of Non-Compliance – In September 2021, the New Jersey Department of Environmental Protection (NJDEP) issued a Notice of Non-Compliance (Notice) to Middlesex based on self-reporting by Middlesex that the level of Perfluorooctanoic Acid (PFOA) in water treated at its Park Avenue Wellfield Treatment Plant in South Plainfield, New Jersey exceeded a standard promulgated in a NJDEP regulation that became effective in 2021. The NJDEP standard for PFOA was developed based on a Health-based Maximum Contaminant Level of 14 parts per trillion. Neither the NJDEP nor Middlesex had characterized this exceedance as an acute health threat. However, Middlesex was required by the regulation to notify its affected customers and complied in November 2021. The Notice further required the Company to take any action necessary to comply with the new standard by September 7, 2022. Prior to 2023, the Company began design for construction of an enhanced treatment process at the Park Avenue Wellfield Treatment Plant to comply with the new standard prior to the regulation being enacted. At that time, the completion of enhanced treatment process was not expected until mid-2023. Consequently, in November 2021, the Company implemented an interim solution to meet the Notice requirements, which included putting the Park Avenue Wellfield Treatment Plant in off-line status and obtaining alternate sources of supply. Subsequently, in June 2022, the Company accelerated the in-service date for a portion of the enhanced treatment project that allowed a restart of the Park Avenue Wellfield Treatment Plant and it is effectively treating the ground water to ensure compliance with all state and federal drinking water standards. On September 13, 2022, the Company entered into an Administrative Consent Order (ACO) with the NJDEP, which requires the Company to take whatever actions are necessary to achieve and maintain compliance with the Safe Drinking Water Act, N.J.S.A, 58:12A-1 et seq., and the Safe Drinking Water Act regulations N.J.A.C. 7:10-1 et seq., including applicable public notifications. The Company’s agreement to enter into an ACO avoided any further Notice regarding the fact that the permanent treatment solution was not in service by September 7, 2022. As prescribed in the ACO, the Company will issue periodic public notifications until the ACO is closed. In addition, in accordance with the ACO: ● On or before June 30, 2023, the Company shall complete the permanent construction of the Park Avenue Wellfield treatment upgrades, place the treatment upgrades into operation, and all water at the Park Avenue Wellfield Treatment Plant shall be treated to comply with the PFOA NJDEP standards. ● The Company must perform required sample testing and reporting for PFOA subsequent to completion of the Park Avenue Wellfield treatment upgrades. ● The Company shall submit to the NJDEP quarterly progress reports detailing the Company’s compliance with the ACO. The Company’s failure to comply with the compliance schedule and/or progress reporting requirements of the ACO could lead to penalties up to $500 per day. In addition, the NJDEP could penalize the Company for other violations, if any, of the ACO. In November 2021, the Company was served with two PFOA-related class action lawsuits seeking restitution for medical, water replacement and other claimed related costs. These lawsuits are in the early stages of the legal process and their ultimate resolution cannot be predicted at this time. The Company’s insurance provider has acknowledged coverage of potential liability which may result from these lawsuits. In May 2022, the Company impleaded 3M Company (3M) as a third-party defendant in one of these class action lawsuits. The Company had previously initiated a separate lawsuit  against 3M seeking to hold 3M accountable for introduction of perfluoroalkyl substances (commonly known as “PFAS”), which include PFOA, into the Company’s water supply at its Park Avenue Wellfield facility. In January 2022, the Company filed a petition with the New Jersey Board of Public Utilities (NJBPU) seeking to establish a regulatory asset and deferred accounting treatment until its next base rate setting proceeding for all costs associated with the interim solution to comply with the Notice. The Company is currently awaiting a decision on this matter from the NJBPU.
Coronavirus (COVID-19) Pandemic	Coronavirus (COVID-19) Pandemic – In January 2023, the United States Secretary of Health and Human Services renewed the determination that a nationwide health emergency exists as a result of the COVID-19 Pandemic with an announced end to the nationwide health emergency on May 11, 2023. While the Company’s operations and capital construction program have not been materially disrupted to date from the pandemic, the COVID-19 impact on economic conditions nationally continues to be uncertain and could affect the Company’s results of operations, financial condition and liquidity in the future. In New Jersey, the declared COVID-19 State of Emergency ended in March 2022. In Delaware, the declared COVID-19 State of Emergency Order ended in July 2021. The NJBPU and the Delaware Public Service Commission (DEPSC) have approved the tracking of COVID-19 related incremental costs for potential recovery in customer rates in future rate proceedings. Middlesex must file a petition with the NJBPU for cost recovery of COVID-19 related incremental costs by May 15, 2023. Delaware has not established a timetable or definitive formal procedures for seeking cost recovery. The Company has increased its allowance for doubtful accounts for higher accounts receivable write-offs due to the financial impact of COVID-19 on customers. We will continue to monitor the effects of COVID-19 and evaluate its impact on the Company’s results of operations, financial condition and liquidity.
Recent Accounting Pronouncements	Recent Accounting Guidance There is no new adopted or proposed accounting guidance that the Company is aware of that could have a material impact on the Company’s financial statements.

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Disclosure of accounting poliy for COVID-19.

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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.

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Disclosure of accounting policy for liabilities for remediation of environmental matters. The accounting policy may specify the conditions under which rate actions of a regulator provide reasonable assurance of the existence of an asset pertaining thereto.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 410
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479817/980-410-S99-1

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