Any site disturbing one acre or more needs erosion and sediment controls under Illinois EPA's ILR10 permit and its Stormwater Pollution Prevention Plan. Silt fence and stabilization keep sediment out of local streams.
The Stormwater Pollution Prevention Plan required by ILR10 is where erosion control lives. A builder in Champaign, Urbana, Rantoul, or the unincorporated county must install and maintain silt fence, stabilized construction entrances, sediment traps, inlet protection, and prompt seeding or mulching of bare soil. In flat, tile-drained farmland, loosened soil moves fast through field tile and ditches toward the Sangamon and Embarras headwaters and Boneyard Creek, so bare ground must be stabilized promptly. Controls stay in place until the site reaches final stabilization, and local MS4 inspectors check them during construction.
Clearing an acre without erosion controls, or letting silt fence fail so sediment reaches ditches or streams, brings Illinois EPA penalties, stop-work orders, and daily fines until the site is stabilized.
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See how Champaign County's erosion control rules stack up against other locations.
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