The City of Flint operates a Municipal Separate Storm Sewer System (MS4) under NPDES Permit MI0053864 issued by Michigan EGLE. The Stormwater Management Program implements Michigan's Part 31 Water Resources Protection (MCL 324.3101+) and federal Clean Water Act requirements through an illicit discharge elimination program.
Flint's stormwater regulation sits across three layers. Federally, the Clean Water Act NPDES program requires MS4 communities to control discharges. At the state level, Part 31 of the Natural Resources and Environmental Protection Act (1994 PA 451, MCL 324.3101 to 324.3119) and Part 91 soil erosion and sedimentation control (earth changes one acre or larger, or within 500 feet of a lake or stream) apply. Locally, the City of Flint holds individual NPDES MS4 Permit MI0053864 from EGLE, requiring a Storm Water Management Program (SWMP), an illicit discharge elimination program, public education, construction site runoff control, and post-construction stormwater management. Flint qualified for Phase I MS4 status as the only Genesee County community over 100,000 at adoption. Reports of illicit discharges go to the MS4 Coordinator at (810) 766-7079.
Discharging non-stormwater into Flint's MS4, failing to install or maintain required erosion controls on a Part 91 earth change, or developing without a stormwater plan violates the NPDES permit and Part 31. EGLE can pursue civil penalties under MCL 324.3115 and the city can require remediation.
Flint, MI
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See how Flint's stormwater management rules stack up against other locations.
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