Short answer: no, not by state statute. Missouri does not have a statewide point-of-transfer septic inspection requirement. That surprises people who have bought property in Iowa, where a Time of Transfer inspection is mandatory, or in other states with similar rules.
What Missouri actually says
The state’s position, through the Department of Health and Senior Services, is that an inspection or evaluation at transfer determines whether the system meets current standards and is operating properly, and that this is informative to everyone in the transaction. Critically, state law does not require the owner to correct items the evaluation notes. The parties to the transaction may require repairs, but the state does not.
So who is actually asking for one?
Three parties, none of them the state:
- Your lender. This is the most common trigger. Many loan products require a satisfactory septic and well evaluation before closing, and the lender’s requirement is contractual, not statutory.
- The buyer or the buyer’s agent. Routinely requested as a contingency, and reasonably so.
- The county. Some Missouri counties have their own rules about when an inspection is required, particularly around a sale. Confirm for the specific county rather than assuming.
The Greene and Christian County wrinkle
Both counties permit onsite wastewater independently, and their rules differ in ways that matter before a sale.
Greene County requires new residential system designs to be signed by a soil scientist, professional engineer, registered sanitarian or geologist, and requires the tank to be pumped and inspected within 72 hours before any modification or replacement begins. If your buyer negotiates a repair, that 72-hour window has to line up with your installer’s start date.
Christian County works from its own 1992 countywide ordinance, which requires all system components to be marked and identified in the field before an application is submitted, and requires fiberglass and plastic tanks to be anchored against flotation. There is no 72-hour pumping clock.
Republic sits in both counties, so which set applies depends on which side of the line the parcel is on.
What to do if you are listing
- Pull the county onsite wastewater permit for your address. Both counties keep them, and the permit names the install year, the design and the installer.
- Ask your lender and your agent, early, whether an inspection is required for the loan product the buyer is likely to use.
- If the system’s service history is unknown, get it pumped and evaluated before listing rather than during a contingency period. Sludge depth cannot be measured meaningfully any other way, and finding out during the option period is the expensive version.