Triennial Review of Maine's Water Quality Standards- 2024 through 2026

Introduction

Maine's water quality standards describe what uses, such as recreation or fishing, are appropriate for which waterbodies, and which criteria and antidegradation measures are in place to protect those uses. More information on Maine's water quality standards can be accessed on DEP's Water Quality Standards page, which provides links to existing Maine statutes and rules.

The federal Clean Water Act (§303(c)(1); 40 CFR Part 131.20 - federal rules, off-site) requires that states periodically, but at least once every 3 years, hold public hearings for the purpose of reviewing water quality standards and, as appropriate, modifying and developing standards. This process is known as the Triennial Review. Maine Statute contains similar language in 38 M.R.S.§464.3.B.

The Department concluded the most recent Triennial Review in 2022. In March 2024, the Department initiated a new Triennial Review, which is expected to extend into 2026 for any required legislation. To start the process, on March 18, 2024 a request to submit proposals on changes to Maine’s water quality standards was sent to recipients at Non-Governmental Organizations, municipalities, tribes, state and federal agencies, etc., and to subscribers to the Department’s subscription list for Opportunity for Comment. Submission guidelines (pdf) including a timetable were included in the mailings.

Over the course of the Review, the Department will evaluate all proposals received and develop draft recommendations for proposed changes. Opportunities for public comment will be offered by the Department and the Board of Environmental Protection. Public comment may also be submitted when the final draft recommendations are before the Maine Legislature as the institution responsible for making statutory changes. Ultimately, the U. S. Environmental Protection Agency must give final approval to any changes made by the State of Maine.

This page will be updated periodically.

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