Maine DWP Update: Updates to the State of Maine Drinking Water Rule
Maine Department of Health & Human Services sent this bulletin at 12/04/2025 03:48 PM ESTThis update is coming to you from the Maine CDC Drinking Water Program.
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Updates to the
State of Maine Drinking Water Rule
Updated Rule Takes Effect December 1, 2025
The Maine CDC Drinking Water Program has amended the state drinking water rules (10-144, Chapter 231) in order to adopt the new Federal PFAS standard by reference. Maine will align with the federal timeline of initial monitoring due April 26, 2027, and compliance with the rule by April 27, 2029.
The new federal standards will regulate all community and non-transient non-community public water systems for six PFAS: PFOA, PFOS, PFHxS, PFNA, HFPO-DA, and mixtures containing PFHxS, PFNA, HFPO-DA, or PFBS. The MCLs will be based on a running annual average (RAA) with a combination of individual MCLs and Hazard Index calculations.
The current interim standard of 20 ppt for six PFAS compounds (alone or in combination) is still in effect for Community Water Systems and Non-community Schools and Child Care Facilities. All actions to address PFAS levels in exceedance of the interim standard must continue. The new federal PFAS Standards become enforceable after the initial monitoring completion deadline of April 26, 2027.
For more information on PFAS, please visit the Drinking Water Program website - PFAS and Well Water - or EPA’s website for Per- and Polyfluoroalkyl Substances (PFAS).
Additional changes to the rule include the Department requiring seasonal and all community public water systems to test for total coliform bacteria monthly, to further protect public health and alert the Department to possible bacterial contamination more quickly.
View or download the final updated Drinking Water Rule here.
URLs
State of Maine Drinking Water Rule (2025):
https://www.maine.gov/dhhs/about/rulemaking/drinking-water-rule-10-144-cmr-ch-231-2025-12-03
• Rulemaking Information (DHHS): https://www.maine.gov/dhhs/about/rulemaking
Maine Drinking Water Program
• Home: www.medwp.com
• PFAS and Well Water:
https://www.maine.gov/dhhs/mecdc/healthy-living/health-and-safety/pfas-in-maine/pfas-and-well-water
US Environmental Protection Agency (EPA)
• Per- and Polyfluoroalkyl Substances (PFAS):
https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas#Summary
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