These regulations protect public water supply sources in Massachusetts. They make sure that our drinking water is safe, fit, and pure.
- This page, 310 CMR 22: The Massachusetts Drinking Water Regulations, is offered by
- Massachusetts Department of Environmental Protection
Regulation 310 CMR 22: The Massachusetts Drinking Water Regulations
Contact for 310 CMR 22: The Massachusetts Drinking Water Regulations
MassDEP Drinking Water Program
Table of Contents
These regulations, 310 CMR 22.00, became effective as of October 2, 2020.
Note: This is an unofficial version of Commonwealth regulations and is posted here for the convenience of the public. It is not an official statement of the regulations.
Proposed Amendments & Public Comment
PFAS Maximum Contaminant Level (MCL) Proposed Amendments & Public Comment
FINAL PFAS MCL AMENDMENTS PROMULGATED OCTOBER 2, 2020
Redline version of regulations, September 16, 2020
PFAS MCL revisions to 310 CMR 22.00 - redline version
Clean version of regulations, September 16, 2020
PFAS MCL revisions to 310 CMR 22.00 - clean version
REGULATORY DOCUMENTS PUBLISHED DECEMBER 27, 2019
MassDEP has filed proposed regulatory changes with the Secretary of State for formal notice and publication in the Massachusetts Register. MassDEP will begin accepting public comments starting December 27, 2019. Please see the public notice for more details.
Public Hearing Notice
310 CMR 22.00 PFAS Amendments Public Hearing Notice
Red line version of regulations
310 CMR 22.00 PFAS MCL Amendments Redline Strikeout
Clean version of regulations
310 CMR 22.00 PFAS MCL Amendments
310 CMR 22.00 Summary of Proposed Regulations and Note to Reviewers
PFAS MCL Proposed Regulation Presentation Slides
Technical Support Documents
Per- and Polyfluoroalkyl Substances (PFAS): An Updated Subgroup Approach to Groundwater and Drinking Water Values
PFAS Analytical Methods Proposed Amendments & Public Comment
Drinking Water Regulations Amendments
310 CMR 22.00 PFAS Analytical Methods Amendments Red Line Strikeout
Laboratory Certification Amendments
310 CMR 42.00 PFAS Amendments Red Line Strikeout
310 CMR 42.00 and 310 CMR 22.00 Regulation Summary for PFAS Amendments
Public Hearing Notice
310 CMR 42.00 and 310 CMR 22.00 Public Hearing Notice for PFAS Amendments
The Massachusetts Department of Environmental Protection (MassDEP) proposes to revise its regulations at 310 CMR 42.00 for the Certification and Operation of Environmental Analysis Laboratories to add a new certification category for Per- and Polyfluoroalkyl substances (PFAS). Changes to 310 CMR 22.00, the Drinking Water regulations, are also proposed which will add references to the appropriate laboratory methods to be followed by certified laboratories. MassDEP is separately proposing revisions to the Timely Action and Fee regulations at 310 CMR 4.00 to create a permit fee category for PFAS laboratory certification.
Recently Promulgated Amendments
310 CMR 22.00: The Massachusetts Drinking Water Regulations Amendments
Amendments to 22.07C(7) Unregulated Synthetic Organic Contaminants and Analytical Methods, and 22.07G(1) PFAS Analytical Methods, effective June 12, 2020.