Water Quality Standards Regulations: Maine

Presented below are water quality standards for the state of Maine in effect for Clean Water Act (CWA) purposes.

EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy.

Documents marked with an asterisk (*) are not part of the official Maine CWA-WQS docket and therefore not subject to review under the Clean Water Act.

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State Standards in Effect for CWA Purposes

In 2015 and 2016, EPA took several approval and disapproval actions on Maine’s WQS. Please refer to EPA’s action letters below for more information on which Maine statutes and regulations have been disapproved and whether they are or are not in effect for Clean Water Act purposes for waters in Indian lands and waters outside Indian lands in Maine pending EPA’s action to promulgate new or revised WQS.

The following statutes are from the Maine Revised Statutes, Title 38, Chapter 3, Subchapter 1: Environmental Protection Board.

Article 1: Organization and General Provisions

Article 1-F: Nonpoint Source Pollution Program

Article 2: Pollution Control

Article 3: Enforcement

Article 4-A: Water Classification Program

The following statutes are from the Maine Revised Statutes, Title 38, Chapter 5, Subchapter 1: Mills and Dams:


[See Letter from Maine DEP to U.S. EPA clarifying provisions of Maine water quality standards related to dam impoundments ]

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Federally Proposed or Promulgated Standards

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