What matters for project planning
The City of Knoxville's Stormwater Engineering Division and Knox County's Engineering & Public Works Stormwater program jointly maintain floodplain maps and administer the Knox County Floodplain Program, including a flood damage prevention ordinance that applies inside mapped flood hazard areas. Because Knoxville's karst limestone terrain produces sinkholes and irregular underground drainage on top of standard stormwater concerns, parcel-specific flood status and drainage conditions should be checked with the city or county before foundation, grading, crawl space, or exterior 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. Verify those points with the appropriate authority and your chosen provider before anything starts.
Sources reviewed 2026-07-20. Maps and requirements referenced here can shift independently, so this should be treated as a starting point.