How do I choose a septic inspector and a repair contractor in Missouri?
Use a Missouri DHSS-licensed inspector or evaluator. For a real-estate transaction the state licenses individuals specifically to inspect or evaluate an existing on-site wastewater system (19 CSR 20-3.070). Check the name against the department's suspended and revoked list before you hire. Missouri rule also keeps the two roles separate: the licensed inspector who assesses your system must tell you, in writing, that you are not obligated to use that same person for any repairs the assessment turns up. The choice of repair contractor is yours.
Verified against 19 CSR 20-3.070 and the Missouri DHSS On-site Wastewater Treatment Program pages, 2026-09-10. General information, not legal advice.
Who is allowed to inspect the system
- A Missouri DHSS-licensed inspector or soil/percolation evaluator. The department keeps a county-filterable list and a separate suspended/revoked list.
- Where a county requires its own licence, that too. St. Charles County, for its change-of-ownership program, requires an inspector licensed by the county. A state licence alone isn't enough there. See St. Charles County.
- For an FHA loan, HUD also allows a qualified appraiser, a government health authority, or a qualified home inspector to perform the septic evaluation — but a licensed septic professional is the safe choice, and some lenders insist on one.
Why the inspector and the repairer are kept separate
Under 19 CSR 20-3.070(10) the person who diagnoses a problem is not the person angling for the repair job. It protects you from an inflated diagnosis: the incentive to find an expensive fault sits with whoever is selling the fix, so the rule removes it from the assessment. HomeCleared keeps the roles separate on purpose for the same reason, and when we connect you to someone, the inspector and the repair contractor are different businesses.
How to verify a licence before you hire
- Get the person's full name and their licence or registration number.
- Confirm it on the Missouri DHSS On-site Wastewater Treatment Program list for your service: inspector/evaluator for the assessment, registered installer for the work.
- Check the same name is not on the department's suspended or revoked list.
- If your county runs its own programme (St. Charles), confirm the county licence too, by calling the county.
Red flags
- The inspector quotes you a repair on the spot, or steers you to “their guy.”
- No licence number offered, or the number doesn't check out.
- A “we buy houses” company offers to “handle the whole thing” — see your options if the inspection fails.
- A verbal repair estimate with no written scope.
What it costs
| Item | Typical range |
|---|---|
| Real-estate septic inspection / evaluation | $300–$700 in Missouri, set by the inspector; confirm locally |
| Private-well water test (a separate certified lab) | A separate charge; the state lab does not do these |
| Repair or replacement (a different, licensed contractor) | A minor fix to a full drainfield replacement — get a written bid |
What “matched” means on HomeCleared
When HomeCleared connects you with a contractor, we say exactly this: “Matched based on verified service coverage, a current licence, stated availability, and — where we have it — observed response history.” We do not say “the best contractor,” “guaranteed,” or “government approved.” We do not rank contractors by who pays us. See how we vet contractors.
Official authorities
- Missouri DHSS — On-site Wastewater Treatment Program · (573) 751-6095 · licenses inspectors/evaluators (19 CSR 20-3.070), registers installers, publishes the county lists and the suspended/revoked list.
- Your county's permitting authority — the local health agency, a sewer district, or building & code enforcement — for any county licence and the repair-permit process. See your county.
Sources & last verified
- — licensure of on-site wastewater inspectors and evaluators; the inspector-vs-repairer separation at subsection (10). Checked 2026-09-10.
- . Checked 2026-09-10.
- : the deceptive-practices case behind why we do not sell a lead to more than one contractor. Checked 2026-09-10.
Found something out of date? Email corrections@homecleared.com.