Madison enforces MGO Chapter 37 stormwater ordinance. New development disturbing 10,000+ sq ft requires permits, BMPs, and 80% TSS removal. Protects Yahara Lakes watershed. WPDES MS4 permit applies citywide.
Madison General Ordinances Chapter 37 (Stormwater Management and Erosion Control) implements Wisconsin DNR NR 151 and NR 216 requirements under the city's WPDES MS4 (Municipal Separate Storm Sewer System) permit. Land disturbance of 10,000 sq ft or more, or creating 20,000+ sq ft of impervious surface, requires a stormwater management permit from Madison Engineering. Post-development discharge must achieve 80% total suspended solids (TSS) removal compared to no-control conditions, peak-flow matching for 1-year and 2-year storm events, and infiltration of 90% of pre-development volume where soils allow. Best Management Practices (BMPs) include rain gardens, bioswales, detention basins, and pervious pavement. The Yahara Lakes (Mendota, Monona, Waubesa, Kegonsa) watershed is subject to enhanced phosphorus standards (Yahara WINS adaptive management). Illicit discharges to storm sewers (soap, vehicle fluids, yard waste) are prohibited and carry forfeitures $250-$5,000. The annual stormwater utility fee funds the program.
No permit for regulated disturbance: stop-work, $500-$5,000/day. Illicit discharge: $250-$5,000 + cleanup. MS4 non-compliance affects city state permit.
Madison, WI
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Madison, WI
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Madison, WI
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Madison, WI
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Madison, WI
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Madison, WI
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See how Madison's stormwater management rules stack up against other locations.
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