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Water Quality and Pollution Control in Michigan Sections 303(d), 305(b), and 314 Integrated Report

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Integrated Report Contacts:

Public Comment - Draft 2026 Assessment Methodology

The Water Resources Division (WRD) is accepting written comments between March 14 and April 14, 2025, on the draft 2026 Assessment Methodology. The Assessment Methodology will ultimately be incorporated as Chapter 3 in the Water Quality and Pollution Control in Michigan, 2026 Sections 303(d), 305(b), and 314 Integrated Report. Every two years the WRD prepares and submits an Integrated Report to the United States Environmental Protection Agency to satisfy the listing requirements of Sections 303(d) and the reporting requirements of Sections 305(b) and 314 of the federal Clean Water Act. The Assessment Methodology describes the processes used to translate available surface water quality data into designated use support assessments in Michigan. The draft 2026 Assessment Methodology is available below, or by contacting Denise Page, Secretary, Water Toxics Unit, Great Lakes Watersheds Assessment, Restoration, and Management Section at PageD@Michigan.gov.

Written comments regarding the draft 2026 Assessment Methodology may be submitted by April 14, 2025, to Kevin Goodwin at GoodwinK@Michigan.gov or Michigan Department of Environment, Great Lakes, and Energy, P.O. Box 30458, Lansing, Michigan 48909-7958. Information Contact: Kevin Goodwin at 517‑290-4198.

2024 Integrated Report

The Clean Water Act (CWA) requires Michigan to prepare a biennial report on the quality of its water resources as the principal means of conveying water quality protection/monitoring information to the United States Environmental Protection Agency (USEPA) and the United States Congress. The Integrated Report satisfies the listing requirements of Section 303(d) and the reporting requirements of Section 305(b) and 314 of the CWA. The Section 303(d) list includes Michigan water bodies that are not attaining one or more designated use and require the establishment of Total Maximum Daily Loads (TMDLs) to meet and maintain Water Quality Standards. The 2024 Integrated Report was submitted to the USEPA on March 21, 2024. Final Approval of the 2024 303(d) list was received from the USEPA on April 19, 2024.

2022 Integrated Report

The 2022 Integrated Report was submitted to the USEPA on May 16, 2022.  Final Approval of the 2022 303(d) list was received from the USEPA on June 14, 2022.