What matters for project planning
Will County lies within the Des Plaines River watershed, where urban flooding is typically basement flooding and sewer backup -- a documented, ongoing concern in regional stormwater planning. The City of Joliet enacted its own Stormwater Management Ordinance and serves as the permitting authority for land-disturbing activity, requiring on-site stormwater control facilities from developers and property owners alike. Parts of Joliet sit within a mapped 100-year flood zone near the Des Plaines River, so parcel-specific flood status should be checked before exterior, foundation, or grading work begins.
Official sources
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.