Grading & Drainage: Chicago vs Oak Lawn
How do grading & drainage rules compare between Chicago, IL and Oak Lawn, IL?
Oak Lawn 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 Lawn, IL
Cook County
Oak Lawn requires new construction and significant improvements to maintain positive drainage away from structures without adversely affecting neighboring properties. Grading plans are reviewed at building permit. Surface water may not be discharged directly onto adjacent properties.
View full Oak Lawn rules →Key Facts Comparison
| Fact | Chicago | Oak Lawn |
|---|---|---|
| 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 | - |
| Slope from Foundation | - | 2% minimum |
| Extension | - | 10 feet from foundation |
| Downspout to Sewer | - | Prohibited |
| Sump to Yard | - | Not to sanitary |
| Final Inspection | - | Required pre-CO |
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 Lawn FAQ
Can water from my yard drain to my neighbor's?
Not as a result of your grading changes. Oak Lawn's rules prevent creating new or increased drainage onto neighboring properties. Preserve or re-establish historic drainage patterns.
Where should my downspouts discharge?
Discharge away from foundations to the yard where water can infiltrate or flow to the street. Do not connect downspouts to the sanitary sewer.
Do I need a grading plan for an addition?
Yes for significant additions or new construction. A grading plan by a licensed surveyor or engineer is reviewed at building permit.
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