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Septic Registry

Licensed septic companies in Wilmington, Delaware

6 businesses on Delaware’s septic licensing records give an address in Wilmington. Wilmington is in New Castle County, which has 38 in total.

1 licensed liquid waste haulers4 licensed system designers2 licensed site evaluators

More licensed companies elsewhere in New Castle County

A Delaware licence is valid statewide. These are based in the same county but a different town, and can legally work in Wilmington.

Septic licensing in Wilmington

How many licensed septic companies are there in Wilmington?
6 businesses give Wilmington as their address on Delaware's septic licensing records. That count is of businesses based in Wilmington, not of everyone who will work there — a Delaware licence is valid across the state.
Do I have to use a company based in Wilmington?
No. Licensing is statewide, so any licensed company can legally work in Wilmington. New Castle County has 38 in total, and companies in neighbouring counties can travel too. Being local usually matters for call-out speed and price, not permission.
How do I check a Wilmington septic company is really licensed?
Every listing here names the record it came from and the date that record was published. To confirm it is still current, check with DNREC, or the state's own licensee dataset.

Other towns in New Castle County

Records as published August 26, 2026. Report a correction.