Do I need a septic permit in District of Columbia?

In nearly all of District of Columbia, an onsite-sewage permit is required before installing or replacing a septic system, even in counties without building codes or zoning. Confirm requirements with the authority listed for your county below.

Bolthole Index county-legal census · checked 2026-07-01

Septic permits in District of Columbia

Septic permitting in District of Columbia is state-run: DC Water (District of Columbia Water and Sewer Authority) handles all 1 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 → Full District of Columbia profile →

1 counties · state agency

District of Columbia21State agencymedium confidence
DC Water (District of Columbia Water and Sewer Authority)
DC Water - Wastewater Treatment ↗

Keep exploring

Every county here has a full profile — its index score, water, land prices, and the rest of its building rules. See the District of Columbia 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.