Cook County requires compliance with the MWRD Watershed Management Ordinance for grading and drainage. Building permits include drainage plan review. Changes to site grading must not direct water onto neighboring properties.
Grading and drainage in unincorporated Cook County are regulated by the MWRD Watershed Management Ordinance and Cook County building permit requirements. New construction and site modifications that alter grading must submit drainage plans as part of the building permit application. The MWRD ordinance requires stormwater management for the 100-year event. Property owners may not direct stormwater runoff onto neighboring properties or public ways. The Department of Building and Zoning reviews site plans for drainage compliance. Illinois common law (civil law rule) provides that a property owner who alters natural drainage patterns causing damage to neighbors may be liable. Swales, berms, and drainage systems must be maintained in working condition.
Grading without permit: building violation, $100–$1,000 fine. Directing water onto neighbor: civil liability. Stormwater non-compliance: MWRD enforcement.
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