Updated
Does Delaware require a septic license?
Yes. Delaware requires septic installers to hold a state credential issued by the Delaware DNREC. Delaware publishes its Class E septic contractor roster as public-domain open data, including company phone and email.
Who licenses septic contractors in Delaware?
Delaware's septic credentials:
- Class E system contractor/installer license
How to check a septic contractor's license in Delaware
- Open the Delaware DNREC lookup.
- Search by the contractor's name, the license holder's name or the license number.
- Check the license type covers your job (installation, pumping or inspection) and that the status is active.
- If the contractor's business name doesn't come up, ask which person on staff holds the license: several states license individuals, not companies.
Septic permits in Delaware
A contractor license says who may do septic work; a permit authorizes a specific system. In Delaware, permits for new systems, replacements and most repairs come from the local health department or the state agency office that covers the property. Ask your installer to pull the permit and include the fee in the quote.
Licensed septic companies in Delaware
The Septic Guide lists 86 septic companies and licensed professionals in Delaware, 84 matched to the state's published list. Source list: DNREC Class E contractor roster (Delaware open data). This is what we could match as of October 2026, not an official count.
All septic companies in Delaware →
Delaware septic licensing: common questions
Do you need a license to install septic systems in Delaware?
Yes. Delaware requires septic installers to hold a state credential issued by the Delaware DNREC. Delaware publishes its Class E septic contractor roster as public-domain open data, including company phone and email.
Who issues septic licenses in Delaware?
The Delaware DNREC issues Delaware's septic credentials: Class E system contractor/installer license.
How do I check a septic contractor's license in Delaware?
Open the Delaware DNREC lookup. Search by the contractor's name, the license holder's name or the license number. Check the license type covers your job (installation, pumping or inspection) and that the status is active. If the contractor's business name doesn't come up, ask which person on staff holds the license: several states license individuals, not companies.
How many licensed septic contractors are in Delaware?
The Septic Guide lists 86 septic companies and licensed septic professionals in Delaware, 84 of them matched to the Delaware Department of Natural Resources and Environmental Control list (data as of October 2026). This counts what we could match; it is not an official total.
Do you need a permit for a septic system in Delaware?
New septic systems, replacements and most repairs need a permit before work starts. The permit comes from the local health department or the state agency office that covers your property, and the permit, not the contractor license, is what authorizes a specific job.
Sources: Delaware DNREC; state license lists loaded into The Septic Guide. See how we verify licenses.