5 rules for unincorporated Champaign County, Illinois.
Verified from official government sources
Land disturbance of one acre or more in Champaign County triggers Illinois EPA's ILR10 construction stormwater permit. Champaign, Urbana, and Savoy layer local detention and MS4 requirements on top.
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.
Coastal rules do not apply in Champaign County. This is landlocked east-central Illinois prairie with no coast. Work near water here is governed by inland floodway permits and drainage-district law.
Champaign County and its cities enforce NFIP floodplain rules, and Illinois DNR requires a permit for construction in a regulated floodway. Boneyard Creek's flood history drove major flood-control work at the University of Illinois.
Ill. Admin. Code tit. 17, Sec. 3700.30(a)
Construction in the floodway of any stream serving a tributary area of 640 acres or more in an urban area, or in the floodway of any stream serving a tributary area of 6,400 acres or more in a rural area, is subject to this Part and requires a permit from the Department.
Grading in Champaign County answers to two systems: the ILR10 stormwater permit for one-acre disturbances, and the Illinois Drainage Code, since drainage districts and field tile blanket this flat farmland.
70 ILCS 605/1-2
"Drain" means any water course or conduit, whether open, covered or enclosed, natural or artificial, or partly natural and partly artificial, by which waters coming or falling upon lands are carried away.
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