Stormwater Management: Des Plaines vs Oak Park

Do I need stormwater approval for a home addition?

Small residential additions are typically below WMO thresholds, but lot grading must still drain away from the foundation and not concentrate flows onto neighbors. Larger projects may trigger detention requirements.

Who regulates stormwater in Des Plaines?

The MWRD Watershed Management Ordinance is the controlling regulation, administered locally by Des Plaines's Department of Public Works/Engineering at (847) 391-5390.

Why does Des Plaines flood so often?

Des Plaines is located along the Des Plaines River and Higgins Creek with significant low-lying areas. The City participates in the NFIP and has invested in flood mitigation, but flooding remains a regional challenge.

Why does Oak Park have stormwater management requirements?

Oak Park is in the Des Plaines River watershed with a combined sewer system prone to overload during heavy rain. Stormwater management reduces flooding risk and sewer backups that have historically affected the village.

Are there rebates for rain barrels or rain gardens?

Yes, the MWRD Green Infrastructure Program may offer rebates for residential stormwater management improvements like rain barrels, downspout disconnection, and rain gardens. Contact the village or MWRD for current program availability.

Where should my sump pump discharge?

Sump pump discharge should be directed to your yard or an appropriate drainage area, not onto neighboring properties or directly into the sanitary sewer. The village can provide guidance on proper discharge locations.