5 county-level rules, plus city-specific rules for 3 cities in Will County, Illinois.
Verified from official government sources
Will County Stormwater Management Ordinance (adopted 2007, amended 2023) governs all new development disturbing 0.5+ acres or adding 5,000+ sq ft impervious. Detention, water-quality, and compensatory storage required in Des Plaines, DuPage, Hickory Creek, and Kankakee River basins. FEMA flood maps apply.
Will County enforces the Countywide Stormwater Management Ordinance (WCSMO) requiring erosion and sediment control plans for any land disturbance of 5,000 square feet or more. Silt fence, stabilized entrances, and inlet protection are required BMPs across Joliet, Bolingbrook, Plainfield, and unincorporated Will County.
Will County has no ocean coastline but regulates development along the DuPage River, Des Plaines River, Kankakee River, Hickory Creek, and numerous lakes and wetlands. WCSMO buffer requirements and FEMA floodplain rules govern riparian setbacks of 30-75 feet depending on waterway classification.
Will County has comprehensive stormwater management regulations (Chapter 55 and Chapter 164 — Water Resource Ordinances). FEMA FIRMs identify floodplain areas along the Des Plaines River, DuPage River, and tributaries. The Will County Stormwater Management Planning Committee advises on floodplain policy. Properties in SFHAs require flood insurance with federally backed mortgages.
Will County requires a site development permit for grading involving 400 cubic yards of earth movement or alteration of drainage patterns. Runoff cannot be directed onto neighboring properties. Detention storage required for impervious increases over 25,000 sq ft.
3 cities in Will County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
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Will County Ordinance Hub →