Water Quality Standards Regulations: Michigan
Presented are water quality standards in effect for Clean Water Act (CWA) purposes for this state.
The EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy. For each document listed under "State Standards in Effect for CWA Purposes", the EPA has made a reasonable effort to identify parts of the standards that are disapproved or are otherwise not in effect for CWA purposes. Additionally, please note the documents may also contain provisions that the EPA does not have the authority and duty to act on under the Clean Water Act because the provisions are not water quality standards.
On this page:
State Standards in Effect for CWA Purposes
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Administrative Rules, Part 4, Water Quality Standards (2006) (pdf)
(Effective January 13, 2006) Document contains revised water quality standards for the Great Lakes, connecting waters, and all other surface waters of the State, except as detailed in the site specific criteria table provided below. -
Administrative Rules, Part 8, Water Quality-Based Effluent Limit Development for Toxic Substances (2006) (pdf)
(Effective January 13, 2006) The rules in this part shall be used to establish toxic substance water quality-based effluent limits. -
Site Specific Criteria in Michigan’s Keweenaw Peninsula (pdf)
(Effective September 26, 2013) Document contains table of site specific criteria for total copper in Michigan’s Keweenaw Peninsula and associated maps. -
Multiple Discharger Variance and Permitting Strategy for Mercury Fiscal Years 2025-2029 (pdf)
(Effective October 9, 2024) Document presents methodologies for developing mercury variances and associated permitting for applicable facilities. The state will develop and implement discharger-specific mercury permit limits that reflect the level currently achievable.