Kankakee County, IL Environmental Rules: Stormwater Management (2026)

, adopted by Ord. No. 2006-04-11-78, keeps surface water on its natural course under § 109-130 unless a grading and drainage permit or approved plans allow a change, and § 109-133 bars releasing anything into the storm drainage system that is not entirely uncontaminated stormwater, aside from listed exemptions such as landscape watering, footing drains and dechlorinated pool discharge. A class 1 grading and drainage permit under § 109-381 covers, among other triggers, adding 500 to 10,000 square feet of impervious surface, disturbing more than 5,000 square feet of land, disturbing more than 500 square feet within 25 feet of a lake, pond, stream or wetland, or moving more than 100 cubic yards of material; it is valid for one year.

A class 2 permit under § 109-383 applies once impervious area tops 10,000 square feet or disturbance exceeds one acre, and requires a topographic survey, drainage plan, engineering calculations, a performance bond, and an application fee set in Chapter 18. The planning director must act on an application within 60 days or the applicant may proceed as filed. Development sites must also file a notice of intent with the Illinois EPA and follow a design hierarchy in § 109-407 that favors preserving floodplains and wetlands, minimizing impervious surface and infiltrating runoff before building detention basins or storm sewers.