GroundRosterLicensed Septic Contractors in Missouri
Missouri lists 976 licensed septic contractors. They are based in 97 counties and 359 cities. 9 license classes appear, covering installation / repair, site testing and inspection.
Checked against Missouri registered onsite wastewater treatment system (OWTS) installers, Missouri registered onsite soil evaluators + Missouri licensed onsite system inspectors/evaluators, Missouri registered onsite wastewater treatment system (OWTS) installers + Missouri registered onsite soil evaluators + Missouri licensed onsite system inspectors/evaluators and Missouri registered onsite soil evaluators. Roster copy last refreshed 2026-11-04.
Browse by county or request free quotes.
Septic (onsite wastewater) contractors handle everything from routine septic tank pumping and cleaning to repairs, inspections, and new system installation. States license each role separately (a pumper is not necessarily licensed to install, and vice versa), so match the license class to the job.
Counties with the most listings based there
Browse Missouri by county
Each listing sits under the county of the address on its license record, which can be a mailing address. 97 counties have listings based there.
Cities with the most listings based there
Septic Installers by city in Missouri
Septic System Installation cost guide
Septic Inspectors by city in Missouri
Site Evaluators by city in Missouri
Perc Test and Soil Evaluation cost guide
Looking for a specific contractor? Search by name, business name, or license number.
Hiring a septic contractor in Missouri
Before you sign anything: confirm the license on this page is still active with the agency that issued it, ask for proof of insurance, and get at least three written quotes; pricing on this work varies widely by site conditions.
How do I check a septic contractor's license in Missouri?
Use the license search to find the listing by name, business name, or license number, then confirm it with the agency that issued the license. Every listing links to the roster it came from.
What does septic pumping, cleaning, repair, inspection, or installation work cost in Missouri?
Our cost guides give national ranges for septic tank pumping and cleaning, septic repairs, inspections, and new system installation. Site conditions, access, and local demand set the real number, so get at least three written quotes from licensed septic contractors in Missouri.
Is a permit required?
Usually, for a new system or well and for most repairs, and the rules are set by the state or the county. Our Missouri permit guide covers who issues them and what they cover.
Listings without a county
76 listings have no county we could place: the license record gives none, and its ZIP code or town doesn't settle one. Search by ZIP, or browse by the town on the record:
Septic inspections in Missouri
Missouri registers onsite system inspectors separately from installers and soil evaluators. If you are buying or selling a home on a septic system, look for a listing whose license type includes "Onsite System Inspector"; that is the credential for a pre-sale septic inspection. A typical inspection covers the tank, baffles, drainfield, and permit history, and usually costs $150 to $900 depending on whether the tank is opened and pumped as part of it.
Permits and Missouri agency resources
Do I need a permit for well or septic work in Missouri? ›
Where this Missouri data comes from
- Missouri registered onsite wastewater treatment system (OWTS) installers · source page
- Missouri registered onsite soil evaluators + Missouri licensed onsite system inspectors/evaluators · source page
- Missouri registered onsite wastewater treatment system (OWTS) installers + Missouri registered onsite soil evaluators + Missouri licensed onsite system inspectors/evaluators · source page
- Missouri registered onsite soil evaluators · source page