What matters for project planning
The City of Joliet has enacted a Stormwater Management Ordinance to limit runoff-related risk from new development and redevelopment, and the City serves as 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, where floodplain-disclosure requirements apply, and Will County maintains its own stormwater and water-resource ordinances covering unincorporated areas.
Official sources
Verify the property, not just the city
Citywide context cannot establish a parcel’s flood zone, permit requirements, soil and drainage 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.