Delaware licensed septic contractors
Delaware publishes its septic licensing through the Delaware DNREC. This is every record it holds, as pages you can navigate: 217 businesses across 3 of 3 counties.
Licensed system contractors
A business the state has licensed for the work that installs, repairs and replaces onsite wastewater systems.
Licensed liquid waste haulers
A business the state has licensed for the work that pumps out and hauls liquid waste.
Licensed system designers
A business the state has licensed for the work that designs onsite wastewater systems.
Licensed systems inspectors
A business the state has licensed for the work that inspects onsite wastewater systems and their construction.
Licensed site evaluators
A business the state has licensed for the work that tests and evaluates whether a site can take an onsite system.
Delaware counties with the most licensed businesses
All 3 Delaware counties
The number is how many licensed businesses give that county as their address. Greyed counties have none — 0 of the 3.
How Delaware regulates septic work
Delaware licenses onsite wastewater work by class, and publishes the whole licensee list as open data. Each class is a separate credential — a company licensed to haul liquid waste is not thereby licensed to install a system.
Every licence in the published dataset carries an approved status; DNREC republishes the dataset as licences change.
Records as published August 26, 2026.