Tinley Park, IL Environmental Rules: Erosion Control (2026)

Construction sites in Tinley Park must implement erosion and sediment control best management practices (BMPs) under the MWRD WMO and Illinois EPA rules. Required measures typically include silt fence along downstream site perimeters, stabilized construction entrances to prevent tracking soil onto streets, inlet protection around storm drains, temporary stabilization of disturbed areas inactive for more than 14 days (seeding, mulching, or erosion control blanket), and permanent stabilization within 14 days after final grading. Projects disturbing 1 acre or more must obtain Illinois EPA NPDES Construction General Permit coverage, which requires preparation of a Stormwater Pollution Prevention Plan (SWPPP), weekly inspections, and inspection after 0.5-inch rainfall events. Concrete washout must be contained, and dewatering discharges must be sediment-free. Village inspectors may issue stop-work orders for failed BMPs. Residential homeowners doing small landscaping or additions typically fall below the 1-acre NPDES threshold but should still minimize sediment loss to Tinley Creek and its tributaries.