Peoria County, IL Environmental Rules: Erosion Control (2026)

Earthmoving in Peoria County runs into two rules. First, disturbing one acre or more triggers Illinois EPA's ILR10 stormwater permit and its pollution-prevention plan. Second, drainage: much of the outlying county lies inside organized drainage districts under the Illinois Drainage Code (70 ILCS 605), and thousands of acres drain through buried field tile. You cannot break, fill, obstruct, or reroute a district drain or regulated tile without the drainage commissioners' consent. On the river bluffs, cut-and-fill grading that dumps concentrated runoff onto a downhill neighbor creates civil liability. Inside the cities, grading permits and drainage review apply through local engineering standards.