Grading & Drainage: Chicago vs Oak Park
How do grading & drainage rules compare between Chicago, IL and Oak Park, IL?
Oak Park has fewer restrictions than Chicago.
Chicago, IL
Cook County
Chicago regulates grading and drainage through the Stormwater Management Ordinance (MCC 11-18) and the Building Code. New development must direct drainage away from structures and manage stormwater on-site without adversely affecting neighboring properties.
View full Chicago rules →Oak Park, IL
Cook County
Oak Park requires grading and drainage plans for construction projects that alter the topography or drainage patterns of a property. Property owners must ensure that surface water drains properly and does not flow onto neighboring properties. Grading permits may be required for significant earthwork.
View full Oak Park rules →Key Facts Comparison
| Fact | Chicago | Oak Park |
|---|---|---|
| Code Section | MCC 11-18, Chicago Building Code | - |
| Standard | Positive drainage away from structures | - |
| Neighbor Impact | Must not increase runoff to adjacent properties | - |
| Sewer System | Combined sewer - on-site retention encouraged | - |
| Authority | Dept. of Water Management | - |
| Grading Plan | - | Required with building permits |
| Drainage Rule | - | Cannot increase flow to neighbors |
| Downspouts | - | Must not connect to sanitary sewer |
| Retaining Walls | - | Permit required over 4 ft |
| Regional Standard | - | MWRD Watershed Management Ordinance |
Highlighted rows indicate differences between cities.
Chicago FAQ
Can I change the grading of my property in Chicago?
Regrading that affects drainage must ensure stormwater does not flow onto neighboring properties. Significant changes may require review by the Department of Water Management under MCC 11-18.
Can I connect downspouts directly to the sewer in Chicago?
Chicago discourages direct downspout connections to the combined sewer system. Disconnecting downspouts and directing water to rain gardens or rain barrels is encouraged as a stormwater BMP.
Oak Park FAQ
Do I need a grading permit in Oak Park?
A grading plan is required as part of most building permits. Significant earthwork may require a separate grading permit even without other construction. Contact the Building Division to determine if your project needs one.
Can I change the slope of my yard?
You may regrade your property, but you cannot alter drainage patterns in a way that increases stormwater flow onto neighboring properties. A grading plan showing existing and proposed drainage is typically required.
Can I connect my downspouts to the sewer?
Direct connection of downspouts to the sanitary sewer is not permitted. Downspouts should discharge onto your property's surface where water can infiltrate or be managed through approved drainage methods.
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