Development of a PFAS Drinking Water Standard (MCL)

Information on MassDEP efforts to establish a drinking water standard for Per- and Polyfluoroalkyl Substances (PFAS).

In January 2019, MassDEP announced its intention to initiate the process to develop a drinking water standard, known as a Maximum Contaminant Level (MCL), for a group of Per- and Polyfluoroalkyl Substances (PFAS). As in all regulatory development, MassDEP is bound to follow all applicable statutes, rules and executive orders for rule-making, including public comment procedures.  In addition, the Department committed to soliciting stakeholder input ahead of and in addition to the public comment period that accompanies all proposed regulations. Information on MassDEP’s MCL development efforts are available below. The content below includes information on an October 2018 petition for rulemaking to establish a “Treatment Technique” drinking water standard for PFAS that MassDEP received from the Conservation Law Foundation (CLF) and the Toxics Action Center (TAC).

On December 27, 2019, proposed revisions to the drinking water regulations were published in the Massachusetts Register, marking the start of the formal public comment period.  The proposed regulation would establish a drinking water standard (MCL) of 20 ng/L for the sum of six specific PFAS.

Video of the January 24, 2020 Public Meeting and Public Hearing on the proposed PFAS MCL is available on MassDEP's YouTube channel:

An informational meeting took place on Thursday, February 20, 2020. Video of this meeting is available here:

Table of Contents

Final PFAS MCL Regulations

PFAS Maximum Contaminant Level (MCL) Proposed Amendments & Public Comment

Stakeholders Meeting #2 - June 20, 2019

Stakeholders Meeting #1 - April 11, 2019

October 2018 Petition to Establish a Treatment Technique Drinking Water Standard

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