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

Macon County Code Chapter 152, adopted under 55 ILCS 5/5-1041 and related authority, requires a land disturbance permit from the County Planning and Zoning Department for any land disturbing activity in unincorporated Macon County that reaches one acre, is part of a larger common plan of development covering one acre or more, or creates a stockpile bigger than 50 cubic yards or a borrow pit. The Department can also require a permit for a smaller site if it decides the work poses a unique threat to water quality or public health.

16). Applicants file a stormwater pollution prevention plan meeting NPDES IL R10, plus an erosion and sediment control plan and stormwater management plan, along with the site's tax parcel number, contractor information and a copy of any notice of intent filed with the state EPA. Existing agricultural use, including planting and harvesting crops, approved USDA-NRCS conservation measures, and additions to existing single-family homes below the chapter's minimum-standard threshold, are exempt from the permit requirement, as is any emergency activity necessary to protect life or property.

A property owner can ask the Department to waive the minimum plan requirements if the project will not impair the chapter's purpose, an approved alternative stormwater plan is in place, or an off-site facility handles the runoff instead; no permit may issue while a waiver request is pending. Violations, including uncorrected conditions after notice, are enforced by the Planning and Zoning Department.