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 specifics with the appropriate Joliet authority and the selected provider before work begins.
This snapshot dates to 2026-07-26; official requirements and maps can be revised later.