Does the general home inspection cover the septic and the well?

No. The septic tank and the well are separate specialist inspections. They take longer to schedule, and the water test needs several business days for lab results. Book them at the start of the inspection period, in parallel with the home inspection — not after it.

Should the seller pay for a septic inspection before listing?

It is optional, but doing it before you list means you find any problem on your own timeline, price it or fix it on your terms, and avoid renegotiating from a weak position during the buyer’s inspection window. A recent certificate can also satisfy some county programs.

How recent does a water test have to be?

For the buyer’s loan: up to 180 days old at closing for FHA and USDA, and 90 days for VA. A test done too early in a slow sale may need repeating.

What should a seller do about septic and well before listing a Missouri home?

Before the home goes on the market: confirm whether it is on a private septic system, a private well, or both, and locate the records. Check whether your county requires an inspection at transfer — St. Charles County does; the others are driven by the buyer's loan. Book the septic inspection and the water test early. They're separate from the home inspection and the water test takes lab days. If a problem is already known, get a written repair bid now, while you still control the timeline — not during the buyer's inspection window.

Loan-program timelines verified against HUD Handbook 4000.1, USDA HB-1-3555 Ch. 12, and VA guidance; county position against the Missouri DHSS Onsite Wastewater FAQ. 2026-09-10. General information, not legal advice.

The checklist

Confirm the system type. Septic, well, both, or on public sewer/water. A home on public sewer and public water is not affected by any of this.
Find the records. The septic permit and as-built diagram, the last pump-out receipt, any prior inspection or county certificate, the well log. Check the county file and, for wells, the Missouri DNR well-log database. If the tank location is unknown, locating it is the first cost — sometimes several hundred dollars.
Check the county rule. Does your county require a point-of-sale inspection or evaluation? Who is the administrative authority, and what is the repair-permit timeline? See your county. Only St. Charles County has a confirmed county mandate among our launch counties.
Book the septic inspection and the water test — early. Use a licensed inspector, and a certified lab for the water (the state lab does not do real-estate tests). Ask the inspector for a report in the format the likely loan type needs — a report that doesn't meet lender format means a second inspection and lost days.
If something is wrong, get a written repair bid from a separate contractor. Not the inspector, and not a verbal ballpark. Knowing the real number before you list is the difference between pricing it in and losing the deal.
Prepare the disclosure honestly. The National Association of Realtors reports failure to disclose as the top claim category against agents. Never fill the disclosure out for the seller; keep independent research on the system's condition in the file.

Costs and deadlines

Item	Detail
Water-test age limit at closing	FHA 180 days · USDA 180 days · VA 90 days
Water-test turnaround	Several business days for lab results; don't leave it to the last week
Septic inspection	$300–$700 in Missouri; locating a buried tank is extra
Repair permit (if a system fails)	County-issued; timelines run longer in spring. Confirm with the county

What not to do

Don't rely on the buyer's inspector to be the first look. By then you are negotiating from a weak position with the clock running.
Don't schedule the septic like a home inspection. It is a separate booking and the water test needs lab time.
Don't assume a closing credit fixes a financed deal. FHA, VA, and USDA will not fund a home with a documented sewage problem — see the five options.
Don't sign with a “we buy houses” wholesaler under pressure. Missouri law now gives you a signed disclosure at least 14 days before you sign, and lets you cancel penalty-free if they skip it (§ 407.3600 RSMo).

This is general guidance. Your county's rule, your contract, and your lender set the actual requirements and deadlines. Confirm anything decision-critical with the county authority, your agent, and the lender.

For the listing agent

Agents with a go-to licensed septic inspector close more rural transactions; agents without septic knowledge set timelines that jeopardise closings. This page is written to be sent to a seller before the listing goes active: the “let's talk about the septic” conversation almost no one has early. Pair it with the county rule and the loan requirements.

Sources & last verified

; ; — water-test age limits and septic requirements. Checked 2026-09-10.
(no statewide inspection requirement at a real-estate transaction; check the local permitting authority). Checked 2026-09-10.
(the county change-of-ownership inspection). Checked 2026-09-10.

Corrections: corrections@homecleared.com.

Common questions

Does the general home inspection cover the septic and the well?: No. The septic tank and the well are separate specialist inspections. They take longer to schedule, and the water test needs several business days for lab results. Book them at the start of the inspection period, in parallel with the home inspection — not after it.
Should the seller pay for a septic inspection before listing?: It is optional, but doing it before you list means you find any problem on your own timeline, price it or fix it on your terms, and avoid renegotiating from a weak position during the buyer’s inspection window. A recent certificate can also satisfy some county programs.
How recent does a water test have to be?: For the buyer’s loan: up to 180 days old at closing for FHA and USDA, and 90 days for VA. A test done too early in a slow sale may need repeating.