Updated
Does Oklahoma require a septic license?
Yes. Oklahoma requires septic installers to hold a state credential issued by the Oklahoma DEQ, Environmental Complaints and Local Services. Oklahoma certifies septic installers by system type: subsurface, lagoon, aerobic spray and aerobic drip.
Who licenses septic contractors in Oklahoma?
Oklahoma DEQ, Environmental Complaints and Local Services.
Oklahoma's septic credentials:
- Certified installer (subsurface, lagoon, aerobic spray, aerobic drip)
How to check a septic contractor's license in Oklahoma
- Open the Oklahoma DEQ, Environmental Complaints and Local Services 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 Oklahoma
A contractor license says who may do septic work; a permit authorizes a specific system. In Oklahoma, 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 Oklahoma
The Septic Guide lists 280 septic companies and licensed professionals in Oklahoma, 257 matched to the state's published list. Source list: DEQ active certified installers list. This is what we could match as of October 2026, not an official count.
- Tulsa County (27)
- Creek County (14)
- Rogers County (14)
- Oklahoma County (13)
- Cherokee County (11)
- Le Flore County (11)
- Delaware County (9)
- Payne County (9)
All septic companies in Oklahoma →
Oklahoma septic licensing: common questions
Do you need a license to install septic systems in Oklahoma?
Yes. Oklahoma requires septic installers to hold a state credential issued by the Oklahoma DEQ, Environmental Complaints and Local Services. Oklahoma certifies septic installers by system type: subsurface, lagoon, aerobic spray and aerobic drip.
Who issues septic licenses in Oklahoma?
The Oklahoma DEQ, Environmental Complaints and Local Services issues Oklahoma's septic credentials: Certified installer (subsurface, lagoon, aerobic spray, aerobic drip).
How do I check a septic contractor's license in Oklahoma?
Open the Oklahoma DEQ, Environmental Complaints and Local Services 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 Oklahoma?
The Septic Guide lists 280 septic companies and licensed septic professionals in Oklahoma, 257 of them matched to the Oklahoma Department of Environmental Quality 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 Oklahoma?
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: Oklahoma DEQ, Environmental Complaints and Local Services; state license lists loaded into The Septic Guide. See how we verify licenses.