Missouri Septic & Well Water Rules
The Missouri Department of Health and Senior Services (DHSS) runs the onsite wastewater treatment program.
This is a short state page. It covers only the facts we've verified from official sources so far.
Real estate inspections
- Anyone inspecting or evaluating an existing onsite system for a real estate transaction must be licensed by DHSS (19 CSR 20-3.070).
- DHSS distinguishes inspections, which include a hydraulic test, from evaluations, which don't. Ask which one you're getting.
Frequently asked questions
What's the difference between a septic inspection and an evaluation in Missouri?
Under DHSS rules an inspection includes a hydraulic test and an evaluation does not. Both must be done by a DHSS-licensed person for real estate transactions.
Sources
Last checked: October 21, 2026
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