Arlington Heights, IL Environmental Rules: Stormwater Management (2026)

Arlington Heights is located within the Salt Creek and Des Plaines River watersheds and is subject to the Metropolitan Water Reclamation District of Greater Chicago (MWRD) stormwater management requirements as well as the Cook County Watershed Management Ordinance. Any development that increases impervious surface area is required to manage stormwater on-site through detention, retention, or other approved best management practices. New construction, additions, and significant site improvements must submit grading and drainage plans as part of the permit application. Detention requirements are triggered when new impervious area exceeds 2,500 square feet. The required detention volume is calculated based on a 100-year storm event. The Village encourages green infrastructure solutions including rain gardens, permeable pavers, and bioswales. Downspouts must not discharge directly onto neighboring properties or public sidewalks. Sump pump discharge must be directed to appropriate locations and not cause icing on sidewalks or streets during winter months. The Village Public Works Department oversees stormwater infrastructure and maintains the storm sewer system. Properties in FEMA-designated flood zones are subject to additional requirements under the Village's floodplain management ordinance.