Grading & Drainage: Oak Park vs Tinley Park
How do grading & drainage rules compare between Oak Park, IL and Tinley Park, IL?
Oak Park and Tinley Park have similar restriction levels.
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 →Tinley Park, IL
Cook County
Tinley Park regulates grading and drainage on residential properties to prevent water from being directed onto neighboring lots or creating flooding. Minor grade changes typically do not require a permit, but substantial grading requires a permit and must not alter established drainage patterns. Sump pump and downspout discharge must be directed to lawns or storm sewer, not onto neighbors or sanitary sewer.
View full Tinley Park rules →Key Facts Comparison
| Fact | Oak Park | Tinley Park |
|---|---|---|
| Grading Plan | Required with building permits | - |
| Drainage Rule | Cannot increase flow to neighbors | - |
| Downspouts | Must not connect to sanitary sewer | Splash to lawn |
| Retaining Walls | Permit required over 4 ft | - |
| Regional Standard | MWRD Watershed Management Ordinance | - |
| Permit | - | Large grading yes |
| Drainage Pattern | - | Preserve established |
| Sump Discharge | - | Lawn or storm sewer |
| Sanitary Sewer | - | Discharge prohibited |
Highlighted rows indicate differences between cities.
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.
Tinley Park FAQ
Can I regrade my yard in Tinley Park?
Minor leveling is typically fine without a permit. Substantial grading, retaining walls, or changes that redirect water flow require a grading permit and review to ensure neighbors are not adversely affected.
Where should my sump pump discharge?
Sump pumps must discharge to your own lawn at least 5 feet from the foundation, or to the storm sewer with Village approval. Discharge to the sanitary sewer is prohibited and should be disconnected if discovered.
My neighbor's drainage floods my yard — what can I do?
Start with a conversation. If unresolved, contact Code Enforcement at (708) 444-5100 to investigate. Persistent issues may require a civil nuisance action under Illinois reasonable use principles.
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