Bolthole Index county-legal census · checked 2026-07-01
Septic permitting in Delaware is state-run, administered by state agencies across all 3 counties.Every entry below names the approving authority for that county, cited to the authority’s own page.
Septic rules change and some cities run their own programs — treat this as a verified starting point, not legal advice. All states → Delaware water rights & wells → Full Delaware profile →
3 counties · state agency
Delaware DNREC, Groundwater Discharges Section (On-Site Wastewater)
Delaware DNREC - Residential (On-Site Wastewater) ↗Delaware DNREC, Division of Water (Groundwater Discharges Section)
Delaware DNREC Septic Systems ↗Delaware DNREC (Ground Water Discharges Section)
Sussex County - Septic System Permits ↗Every county here has a full profile — its index score, water, land prices, and the rest of its building rules. See the Delaware state page for all counties ranked, or the national septic guide.
General guidance, not legal advice. Off-grid, building, and land-use rules are often set at the county level and change often. Verify with your county and state before acting. Data reviewed 2026-06-26.
