5 county-level rules, plus city-specific rules for 3 cities in Lake County, Illinois.
Verified from official government sources
The Lake County Watershed Development Ordinance (WDO), administered by the Stormwater Management Commission (SMC), applies countywide. Permits required for 5,000+ sq ft disturbance, floodplain work, or wetland impacts. Fox River, Des Plaines River, and Chain O'Lakes flood-prone areas enforce strict floodway standards.
Lake County enforces strict erosion and sediment control under the Watershed Development Ordinance (WDO) Article V. Any land disturbance over 5,000 sq ft requires a permit, SESC plan, silt fencing, and stabilized construction entrance per NPDES ILR10 rules.
Waukegan, Highland Park, and Lake Forest enforce strict Lake Michigan coastal bluff setbacks and IDNR Office of Coastal Management review. Lake County WDO also requires 100-ft riparian buffers along the Des Plaines, Fox River, and Chain O'Lakes.
Lake County has extensive floodplain regulations. The Watershed Development Ordinance (WDO) governs all development in floodplains. Lake County is a CRS community, qualifying residents for flood insurance discounts up to 20%.
Lake County WDO requires a Watershed Development Permit for any grading over 5,000 sq ft or 100 cubic yards of fill. Drainage must not redirect stormwater onto neighbors per Illinois civil law rule (reasonable-use doctrine).
3 cities in Lake County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for Lake County — parking, noise, fences, fires, animals, pools, and more.
Lake County Ordinance Hub →