What matters for project planning
The City of Joliet enacted a Stormwater Management Ordinance to limit runoff-related risk from new development and redevelopment, and the city is the permitting authority for land-disturbing activity, requiring landowners to maintain on-site stormwater control facilities. Parts of Joliet sit within a mapped 100-year flood zone near the Des Plaines River, and the city applies floodplain-disclosure requirements in those areas. Will County separately maintains Chapter 55 (Stormwater Management) and Chapter 164 (Water Resource Ordinances) in its county code, setting requirements for unincorporated areas.
Official sources
- City of Joliet Stormwater Management Plan
- Joliet permits, Community Development Dept. (150 W. Jefferson St., Joliet, IL 60432, (815) 724-4040)
- Will County Stormwater Management (Ch. 55)
- Will County Water Resource Ordinances (Ch. 164)
Verify the property, not just the city
Citywide context cannot establish a parcel’s flood zone, historic designation, permit requirements, soil conditions, or concealed construction. Confirm those items with the appropriate authority and selected provider before work begins.
Sources reviewed 2026-07-26. External requirements and maps can change.