Oklahoma septic permit steps and DEQ fees for 2026-27
Every new or modified home septic system in Oklahoma goes through the Department of Environmental Quality (DEQ), whether you live outside Edmond, Choctaw, Newcastle or anywhere else in the OKC metro. Here are the steps and the fees DEQ currently charges, straight from DEQ's own pages. Checked November 2, 2026.
Step 1: Report for On-Site Sewage (the 581) and soil test
The 581 report decides which system types your lot can use and the minimum dispersal area for the size of your house. It rests on one of three things: a soil profile test (at least three holes or pits in the dispersal area, done only by DEQ or a DEQ-certified soil profiler), a percolation test (only for conventional systems, done by someone registered with the Department of Health), or "Design Only," which assumes Group 5 clay soil and works only for aerobic spray or lagoon systems (DEQ sewage treatment page). You can find a profiler on the DEQ certified soil profiler list.
Step 2: Authorization to Construct (ATC)
Before installing a new system or changing an existing one, the installer files DEQ Form 641-575 with the fee, and the 581 goes to the local DEQ office (OAC 252:641-1-2.1, DEQ rules, OAC 252:641). Once bought, the ATC is assigned to the local DEQ Environmental Specialist for review (DEQ sewage treatment page). Every request needs your Section, Township and Range, which you can get from your deed or the county assessor (DEQ online payments page).
Step 3: Inspection before backfill
DEQ inspects the system before it is covered, unless a DEQ-certified installer self-inspects. Certified installers file the final inspection on Form 641-576 within 15 days (DEQ sewage treatment page). Since November 1, 2025, people who are not DEQ-certified may install only one system per calendar year. Check any installer on the DEQ list of active certified installers.
DEQ fees, July 1, 2026 to June 30, 2027
| Service | Fee |
|---|---|
| Soil test, DEQ augered | $357.28 |
| Soil test, pits provided by applicant | $214.36 |
| ATC, self-inspect (certified installer), up to 1,500 gpd | $357.28 |
| ATC, DEQ inspects, up to 1,500 gpd | $500.19 |
| ATC, DEQ inspects, over 1,500 gpd | $643.08 |
| ATC, installer in training, up to 1,500 gpd | $357.28 |
| Modify existing system, self-inspect | $214.36 |
| Modify existing system, DEQ inspects | $357.28 |
| Alternative system plan review | $285.80 |
| Existing system evaluation | $357.28 |
| Private well evaluation | $295.74 |
Source: DEQ 252:641 fee schedule, effective 7/1/2026 to 6/30/2027. The rule sets base fees and lets DEQ raise them each July 1 with the Consumer Price Index (OAC 252:641-23-4), so check the schedule again after next July. Fees are non-refundable once the service is provided (DEQ online payments page).
What this means for your budget
A typical new home system with a DEQ-augered soil test and a certified installer who self-inspects pays DEQ $357.28 plus $357.28, or $714.56, before any installation cost. Your city may also want a building or plumbing permit, so call city hall too. See our septic cost guide, run the numbers in the septic cost calculator, or read the one-page permit cheat sheet.
Related: permit steps and fees · inspection when buying · aerobic rules · signs of failure · all septic rules