Environmental Rules in Peoria County, IL (2026)
4 county-level rules, plus city-specific rules for 1 city in Peoria County, Illinois.
Verified from official government sources
Stormwater Management
Peoria County requires an Erosion, Sediment, and Stormwater Control Permit before any commercial, institutional, multifamily or industrial project over half an acre, or any project needing subdivision approval over half an acre, can break ground in the unincorporated county.
Peoria County Stormwater Control Permits
Significant RestrictionsPeoria County UDO § 3.13
Before commencing any commercial, institutional, multifamily or industrial project with an area of more than one-half (½) acre; or a project requiring subdivision approval by a unit of local government with an area of more than one-half (½) acre, the owner of the land, or his representative, shall be required to file an application for an Erosion, Sediment, and Stormwater Control Permit.
Erosion Control
Grading in Peoria 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 the flat farmland beyond the bluffs.
Peoria County Grading & Drainage Rules
Some Restrictions70 ILCS 605/1-2
"Drain" includes ditch and 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.
Flood Zones
Peoria County and its cities enforce NFIP floodplain rules, and Illinois DNR requires a permit for construction in a regulated floodway. The Illinois River floodplain shapes the Peoria riverfront and low-lying neighborhoods.
Peoria County Flood Zone Regulations
Heavy RestrictionsIll. 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.
Flood Elevation Requirements
Peoria County requires new buildings and substantial improvements in a mapped floodplain to sit above the flood protection elevation, defined as the base flood elevation plus a two-foot freeboard cushion. The Zoning Administrator enforces the standard through the county's floodplain development permit, and every mechanical system in the structure has to clear that same line.
Peoria County Flood Protection Elevation Rules
Some RestrictionsPeoria County Unified Development Ordinance §§ 11.1, 7.14.7
Flood Protection Elevation: The elevation of the base flood elevation or 100-year frequency flood plus two (2) feet at any given location in a designated floodplain, pursuant to Sections 3.10 ("Floodplain Development Permit") and 7.14 ("Floodplain Regulations") of this chapter. ... 2.Protecting Buildings. All buildings located within a floodplain shall be protected from flood damage below the f...
Environmental Rules by City in Peoria County
1 cities in Peoria County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
All Peoria County ordinances
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