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

Kankakee County Code § 109-351, part of the Construction Site Runoff Control division of the stormwater ordinance (Ord. No. 2006-04-11-78), requires appropriate BMPs such as silt fences, diversions and sediment traps before grading activities begin on any construction site in unincorporated Kankakee County, so sediment does not leave the site. The owner must minimize disturbed area, protect and stabilize disturbed soil, and manage construction entrances so sediment is not tracked onto public roads; any sediment that is tracked onto a street must be removed immediately.

Disturbed areas must be stabilized with approved vegetative measures within 14 calendar days after active disturbance or redisturbance ends, and temporary erosion and sediment control BMPs must stay in place and be fully maintained until permanent vegetation is established, after which they must come out within 30 days. Section 109-353 lets the county reach any nonagricultural construction activity, no matter its size, if it is causing or contributing to erosion, sediment or stormwater problems. The site's owner is responsible for compliance under § 109-348, and § 109-352 keeps that duty running to future owners through later maintenance or construction on the same site.

These erosion control duties apply on top of, not instead of, the grading and drainage permit thresholds in division 2 of the same article, which require a site plan and BMP details for most disturbances over 5,000 square feet.