Erosion Control: Des Plaines vs Tinley Park
How do erosion control rules compare between Des Plaines, IL and Tinley Park, IL?
Des Plaines and Tinley Park have similar restriction levels.
Des Plaines, IL
Cook County
Construction sites in Des Plaines disturbing 1/2 acre or more must implement erosion and sediment control measures under the MWRD Watershed Management Ordinance. Sites disturbing 1 acre or more must obtain Illinois EPA NPDES coverage under General Permit ILR10 with a Stormwater Pollution Prevention Plan.
View full Des Plaines rules →Tinley Park, IL
Cook County
Tinley Park requires erosion and sediment control measures on construction sites disturbing soil under MWRD Watershed Management Ordinance standards. Silt fence, inlet protection, construction entrance stabilization, and permanent stabilization within 14 days of final grading are typical requirements. Projects disturbing 1 acre or more require Illinois EPA NPDES Construction General Permit coverage.
View full Tinley Park rules →Key Facts Comparison
| Fact | Des Plaines | Tinley Park |
|---|---|---|
| BMP Threshold | 1/2 acre | - |
| NPDES Threshold | 1 acre | - |
| Permit | IL EPA ILR10 | - |
| SWPPP | Required >1 acre | - |
| Trackout | Must be cleaned | - |
| Silt Fence | - | Perimeter required |
| Inlet Protection | - | All nearby drains |
| NPDES Permit | - | 1+ acre disturbance |
| Stabilization | - | Within 14 days |
| Inspections | - | Weekly + after rains |
Highlighted rows indicate differences between cities.
Des Plaines FAQ
Do I need erosion control for a home addition?
Smaller projects below 1/2 acre disturbance still must manage soil and prevent sediment from leaving the site. Larger projects must implement formal erosion control plans approved by City Engineering.
When do I need an Illinois EPA permit?
Construction projects disturbing 1 acre or more of land must obtain NPDES coverage under General Permit ILR10 and prepare a Stormwater Pollution Prevention Plan.
What about sediment tracked onto the street?
Trackout from construction sites onto public streets is prohibited and must be cleaned promptly. Stabilized construction entrances are required to minimize trackout.
Tinley Park FAQ
Does my home project need erosion controls?
Any construction with soil disturbance should include silt fence and inlet protection downstream. Projects over 1 acre require Illinois EPA NPDES permit coverage with formal SWPPPs and inspections.
What BMPs does Tinley Park require?
Silt fence, stabilized construction entrances, inlet protection, and stabilization of inactive areas within 14 days. Final stabilization must occur within 14 days of final grading.
Can I do my own erosion control inspection?
For small residential projects, yes. NPDES-permitted projects over 1 acre require a qualified SWPPP inspector to perform weekly and post-rain inspections with documented reports.
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