Missouri septic permit requirements
Split. DHSS sets statewide minimums and has direct jurisdiction in counties with no local ordinance, just under half of Missouri counties. The rest are regulated by a county ordinance that can be stricter than the state floor.
- Issuing agency: Missouri DHSS, Onsite Wastewater Treatment Program, plus county health authorities
- Sourced from the agency itself
The permit process, step by step
| Step | What it involves |
|---|---|
| 1. Find out who regulates your county | If your county has its own wastewater ordinance, its rules govern and are often stricter. Otherwise DHSS or the local public health agency permits to state standards. |
| 2. Soil evaluation or percolation test | DHSS maintains lists of who may run percolation tests and who may perform soil morphology evaluations. Counties can add requirements. |
| 3. Construction permit | Required before installation or repair on any residential property under three acres. |
| 4. Installation by a registered installer | Installers register with DHSS as Basic or Advanced; counties with ordinances commonly require local certification as well. |
Source: health.mo.gov. rules change; confirm with the agency before starting work.
What trips people up
- The three-acre rule: a construction permit is required on residential lots under three acres. Larger parcels may be exempt from the permit, though construction standards still apply.
- Systems over 3,000 gallons per day also need construction and operating permits from Missouri DNR.
- County ordinances routinely exceed state minimums, check the county page before assuming state rules apply.
| Fee | Amount |
|---|---|
| Permit fees | Set by the permitting authority, county health department where an ordinance exists, otherwise DHSS |
County-specific requirements
Local rules that differ from, or add to, the state process.
Find a licensed pro in Missouri
- Ashland
- Aurora
- Bolivar
- Bonne Terre
- Boonville
- Branson
- Camdenton
- Cameron
- Clinton
- Columbia
- De Soto
- Eldon
- Eureka
- Excelsior Springs
- Fulton
- Galena
- Harrisonville
- Hillsboro
- Holden
- Jefferson City
- Joplin
- Kansas City
- Kearney
- Lake Ozark
State licensing records: official roster. Every SepticNear listing is checked against it. All Missouri coverage →
Common questions
Who issues septic permits in Missouri?
Missouri DHSS, Onsite Wastewater Treatment Program, plus county health authorities. Split. DHSS sets statewide minimums and has direct jurisdiction in counties with no local ordinance, just under half of Missouri counties. The rest are regulated by a county ordinance that can be stricter than the state floor.
Do I need a soil or percolation test?
DHSS maintains lists of who may run percolation tests and who may perform soil morphology evaluations. Counties can add requirements.
Can I install my own septic system in Missouri?
Installation is restricted to licensed or registered installers in nearly all cases.
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