Stormwater Management: Chicago vs Oak Lawn
How do stormwater management rules compare between Chicago, IL and Oak Lawn, IL?
Chicago and Oak Lawn have similar restriction levels.
Chicago, IL
Cook County
Chicago's Stormwater Management Ordinance (MCC 11-18) requires regulated developments to capture and manage stormwater runoff, including capturing the first half-inch from impervious surfaces. The 2024 Stormwater Manual provides detailed BMP guidelines.
View full Chicago rules →Oak Lawn, IL
Cook County
Oak Lawn is subject to the Metropolitan Water Reclamation District of Greater Chicago (MWRD) Watershed Management Ordinance (WMO) for stormwater and floodplain management. Development projects disturbing 0.5 acres or more require a WMO permit with detention, water quality, and runoff controls. Smaller residential projects follow Village grading and drainage rules.
View full Oak Lawn rules →Key Facts Comparison
| Fact | Chicago | Oak Lawn |
|---|---|---|
| Code Section | MCC 11-18 | - |
| Volume Capture | First 0.5 inch from impervious surfaces | - |
| Alternative | 15% impervious surface reduction | - |
| Authority | Dept. of Water Management | MWRD WMO |
| Manual | 2024 Stormwater Management Ordinance Manual | - |
| Permit Threshold | - | 0.5 acres disturbance |
| Volume Control | - | 1-inch retention |
| Detention | - | Peak rate control |
| Local Grading | - | Oak Lawn Public Works |
Highlighted rows indicate differences between cities.
Chicago FAQ
What triggers stormwater management requirements in Chicago?
Regulated developments as defined in MCC 11-18 must submit a stormwater management plan. This generally applies to new construction and significant redevelopment projects that increase impervious surface area.
What BMPs does Chicago accept for stormwater management?
Approved BMPs include green roofs, rain gardens, permeable pavement, bioswales, cisterns, rain barrels, and native landscaping. The 2024 Stormwater Manual provides detailed design guidance.
Oak Lawn FAQ
Do I need a stormwater permit for my home project?
Most residential lot projects disturb less than 0.5 acres and do not require an MWRD permit, but must comply with Oak Lawn's grading and drainage rules at building permit.
Who regulates stormwater in Oak Lawn?
MWRD administers the Watershed Management Ordinance for larger projects. Oak Lawn enforces lot-level grading, drainage, and downspout rules through its Building Department.
Can I discharge my sump pump to the street?
Sump discharge to the street or alley is typically acceptable where it drains to a storm sewer. Discharge directly onto neighboring property is not permitted. Check Oak Lawn Public Works for specifics.
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