Stormwater Management: Joliet vs Romeoville
How do stormwater management rules compare between Joliet, IL and Romeoville, IL?
Joliet has fewer restrictions than Romeoville.
Joliet, IL
Will County
The City of Joliet regulates stormwater management through its Consolidated Stormwater Management Regulations (Chapter 8, Article X). The ordinance controls peak discharge rates, requires detention for new development and redevelopment, and mandates best management practices. Peak 2-year discharge cannot exceed 0.04 cfs per acre and peak 100-year discharge cannot exceed 0.15 cfs per acre.
View full Joliet rules →Romeoville, IL
Will County
Will County Stormwater Management Ordinance (adopted 2007, amended 2023) governs all new development disturbing 0.5+ acres or adding 5,000+ sq ft impervious. Detention, water-quality, and compensatory storage required in Des Plaines, DuPage, Hickory Creek, and Kankakee River basins. FEMA flood maps apply.
View full Romeoville rules →Key Facts Comparison
| Fact | Joliet | Romeoville |
|---|---|---|
| Governing Code | Joliet Code Chapter 8, Article X | - |
| 2-Year Peak Discharge | Maximum 0.04 cfs per acre | - |
| 100-Year Peak Discharge | Maximum 0.15 cfs per acre | - |
| Standing Water | Must drain within 72 hours in dry basins | - |
| Permit Required | Stormwater control plan for all land-disturbing activities | - |
| Maintenance | Property owner responsible for on-site facilities | - |
| Trigger | - | 0.5 ac or 5,000 sf |
| Detention Storm | - | 100-yr 24-hr |
| Water Quality | - | 1.25 in first flush |
| Comp Storage | - | 1.5:1 in floodplain |
| State Authority | - | 70 ILCS 1815 |
Highlighted rows indicate differences between cities.
Joliet FAQ
What are Joliet's stormwater discharge limits?
The peak 2-year discharge cannot exceed 0.04 cfs per acre, and the peak 100-year discharge cannot exceed 0.15 cfs per acre of property drained.
Do I need a stormwater plan for my development project in Joliet?
Yes. All land-disturbing activities require an approved stormwater control plan. The city is the permitting authority and reviews all plans for compliance.
Who maintains stormwater facilities in Joliet?
Property owners are responsible for maintaining all on-site stormwater control facilities and open space areas required by the approved plan.
Romeoville FAQ
Does my home addition need a stormwater permit?
Additions creating less than 5,000 sq ft of new impervious surface and disturbing less than half an acre are exempt from the WCSMO permit, though they still count toward municipal lot-coverage limits. Projects in FEMA floodplains trigger additional review regardless of size.
How do I know if my property is in a floodplain?
Check the FEMA Map Service Center at msc.fema.gov using your address, or use the Will County GIS floodplain viewer. Properties along the Des Plaines, DuPage, Hickory Creek, or Kankakee Rivers frequently lie in the 100-year floodplain and require elevation certificates for construction.
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