What Should I Check on a Well and Septic Before I Make an Offer?

Yes, and most of what decides it can be checked before you write the offer. A loan asks two questions about a home on private systems: is the water safe and continuously available, and is there a safe method of sewage disposal. The answers live in records the county already holds. You do not have to wait for an appraiser to find out.

I'm Jeff Moran, a mortgage broker in Bluffton, South Carolina, originating since 1996, NMLS #483943, through C2 Financial Corporation, licensed in fifteen states. Across those states, a large share of the inventory outside the metros runs on a well and a septic tank, and the calls I get about it all have the same shape. Somebody found the home. The listing says "well/septic." Their agent said the lender will want a water test. Nobody has told them what that means, so they are deciding whether to write the offer on a feeling.

The feeling is unnecessary. Most of this is published, and the parts that are not published are in a file cabinet at the county health department with the property address on it.

What a loan is actually asking about a private system

Strip away the program names and there are two requirements, and they are about the property rather than about you.

A continuing and sufficient supply of safe, potable water, under adequate pressure, of appropriate quality for household use. Continuing and sufficient are separate words doing separate jobs. Water that is clean but produces a trickle fails the second one. Water that flows freely and carries bacteria fails the first.

Sanitary facilities and a safe method of sewage disposal. That is the septic question, and as you will see below, it is really a question about whether a public line is available instead.

Those two lines are from the FHA single-family handbook, section II.A.3.a, Property Acceptability Criteria, as revised 06/27/2025 (HUD Handbook 4000.1). I cite FHA on purpose even though most of these purchases are conventional. FHA writes its property rules down in more detail than anyone else, so it is the clearest published picture of what a private system has to do. Conventional and VA files lean harder on the appraiser and the local health authority: similar substance, thinner paper trail. On an FHA loan the language below is the actual rule, not a guideline.

Which water sources will not work, and how to spot one in the listing

This is the single most useful thing to check before you fall in love with a home, because it is the one item with no repair path.

Under the same FHA section, a property is not eligible for FHA mortgage insurance when its water source includes a mechanical chlorinator, or where the property is served by springs, lakes, rivers, sand-point wells, or artesian wells. A drilled well is the ordinary case and it is fine. The list above is the set of sources that are treated differently.

You can screen for this yourself. Read the listing remarks and the seller's property disclosure and look for the actual words. "Spring-fed." "Cistern." "Shared well." "Sand point." Agents write these in casually, because to them it is a feature of a country property and to a file it is the first question. If one of those words appears, have that conversation before the offer.

Who is allowed to draw the water sample

Here is where a well-meaning seller costs everyone two weeks.

A well water test has to be performed by a disinterested third party, and that includes collecting and transporting the sample. The buyer cannot take the sample. Neither can the owner, the listing agent, or anyone else with a stake in the sale. The collection and the test have to come from the local health authority, a commercial testing laboratory, a licensed sanitary engineer, or another party acceptable to the local health authority.

So the clean glass jar the seller filled last spring and drove to the county office is not a test. It may well be accurate. It is not usable.

Two more specifics worth carrying into the offer:

• The report cannot be more than 180 days old at disbursement. A test from last year does not travel.
• The standard is the health authority with jurisdiction. Where no local or state water quality standard exists, the benchmark is the EPA's National Primary Drinking Water Regulations at 40 CFR Parts 141 and 142.

A test is also specifically required, among other cases, when the property is newly built, when the appraiser reports a problem with the well or the water, when the water is reported or known to be unsafe, or when the property is close to a dump, a landfill, an industrial site, or farmland where pesticides are used. That last one catches more rural properties than people expect.

If the water needs treatment, there is a path, and it has moving parts

A failed test is not the end of the purchase. It does change what the file has to carry.

Where a property cannot supply safe, potable water without treatment, the requirement is a full arrangement rather than a filter: an individual water purification system, a service contract for its ongoing maintenance, a plan approved by the local or state health authority, and an escrow account. The buyer also gets written notification naming the specific contaminants and the health hazard they present, along with a written estimate of what maintaining and replacing the equipment costs.

That is a real path and I have seen files close on it. It is also four things to arrange instead of zero, which is the argument for asking about water quality in week one.

Shared wells: the recorded agreement is the asset

If two or more homes draw from one well, the document matters as much as the water.

A shared well has to serve properties that cannot feasibly be connected to an acceptable public or community water system. It has to deliver a continuous supply, such that each existing-construction property is simultaneously assured of at least three gallons per minute over a continuous four-hour period (five gallons per minute for proposed construction). A lower-yielding well can still work where pressurized storage makes 720 gallons available to each property.

Then there is the agreement itself, which is recorded and binds whoever owns the properties next. Among the terms it has to carry: no party may locate or relocate any part of a septic system within 75 feet of the shared well (100 feet for proposed construction), easements have to exist for access and working space, repair costs get shared on a defined basis, any party can act to correct an emergency when the others are not there, and the agreement cannot be amended during the term of a federally insured or guaranteed mortgage on any property it serves.

The practical version: ask for the recorded shared-well agreement before you write the offer. If the seller produces it, read who pays for what. If the seller cannot produce one, you have found the actual issue, and you have found it while you still have every option.

The septic question is really a connection question

The rule here surprises people, because it does not start with the tank.

The requirement is to connect to a public or community sewage system whenever that is feasible and available at a reasonable cost. Only when connection costs are not reasonable does an existing onsite system become acceptable, and then only where it is functioning properly and meets the local health department's requirements.

From there the handbook is specific about what happens when a system is not sufficient:

• If the onsite system is insufficient and an off-site system is available, the file has to connect to the off-site system.
• If the onsite system is insufficient and no off-site system is available, the property is rejected unless the system is repaired or replaced to local health department standards.

Read that last line again, because it is good news written in bureaucratic clothing. A failing septic system has a defined cure. The question is never whether it can be fixed. The question is who pays and by when, and that is a contract term you negotiate, not a mystery you discover.

The records to ask for before the offer

None of this requires a specialist. It requires asking, early, for documents that already exist.

1. The well construction report. Depth, casing, and the date drilled. Most states hold these at the environmental or health agency, often searchable by address or parcel.
2. The most recent water test, and who performed it. The second half of that sentence decides whether it counts.
3. The septic permit and the as-built site plan, from the county health department. This tells you the system's design capacity, which is how you find out whether a three-bedroom permit is under a five-bedroom home.
4. Pumping and service records. A tank pumped on a schedule and a tank nobody has touched are different properties.
5. The recorded shared-well agreement, if any well is shared.
6. The seller's disclosure language about the water source, read word by word.

Ask for these while you are still comparing homes. A seller who has them is telling you something. So is a seller who does not.

What I see go wrong

Waiting for the appraisal to learn the water source. By then you are weeks in with money committed. The listing already told you, and so would one question.

Accepting the seller's own test. Accurate or not, it does not satisfy the requirement, and finding that out late costs you the turnaround time of a real test.

"It has been fine for decades." Probably true, and not responsive. The file needs a current document, not a track record.

Writing an offer with no repair-path language. Inspection contingencies are standard. Language specifically covering the well test, the septic inspection, and who cures a failure is not automatic, and a private-systems property is exactly where you want it.

Scheduling in week three. Rural service providers are not always available on short notice, a failed test means treatment and a retest, and none of that compresses. Put these on the same early list as everything else that runs on its own clock between contract and closing.

An illustration, so the sequence is clear

Numbers and details below are made up to show the mechanism.

A buyer is looking at a home on three acres with a drilled well and a septic system. Before writing, they ask for the records. The well report comes back drilled and cased, no issues. The septic permit shows a two-bedroom design. The home is marketed as three bedrooms.

That mismatch is now a pre-offer fact instead of a post-inspection fight. The buyer writes the offer with a septic contingency naming the permit discrepancy and giving the seller a defined window to produce an amended permit or price the correction. The seller, who genuinely did not know, turns up county records showing the system was expanded and permitted under the prior owner's name.

Cost of finding out early: two phone calls. Cost of finding out in week three of a contract: a renegotiation with the appraisal already ordered.

What to do now

Pull the well and septic records on the property you are considering, and read the listing for the words that name the water source. Then price the purchase so you know what the payment looks like before the offer rather than after it. You can see real numbers on the rate tool without a credit pull and without an account, and if you want the file looked at properly, pre-approval is the step where a private system should first come up, not the appraisal.

If the property also comes with meaningful acreage, the valuation questions are a separate subject and they are covered on buying a home on acreage. If you are wondering who can require a repair once you are under contract, that is the appraiser and inspector question. And rural properties price differently for coverage, which is why insurance belongs in the conversation before the offer.

Common questions

Can I get a mortgage on a house with a well and septic?

Yes. Private water and sewage systems are ordinary on rural and semi-rural property and are financed with conventional, FHA and VA loans. What the file needs is evidence that the water is safe and sufficient and that the sewage system works and meets the local health department's requirements. The systems have to be documented rather than avoided.

Who pays for the well water test and the septic inspection?

That is negotiated in the purchase contract, and local custom varies. What is not negotiable is who performs the test: it has to be a disinterested third party, and neither the buyer nor the seller may collect or transport the water sample. Decide the payment question in the offer, and write in what happens if a result comes back needing correction.

How long is a well water test good for?

Under the FHA handbook, the report cannot be more than 180 days old as of disbursement. A test run earlier in the year, or one the seller had done before listing, can easily fall outside that window by the time a purchase closes, which is why an old test is worth confirming rather than relying on.

What happens if the septic system fails the inspection?

There is a defined cure. Where an onsite system is insufficient and an off-site sewage system is available, the connection has to be made. Where none is available, the property is acceptable once the system is repaired or replaced to local health department standards. So a failure becomes a question of cost, timing and who bears it, which belongs in the contract rather than in a last-minute scramble.

What should I ask about a shared well before making an offer?

Ask for the recorded shared-well agreement and read it. It should establish easements, define how repair and operating costs are shared, allow any party to correct an emergency alone, and keep septic components a set distance away from the well. If no recorded agreement exists, that is the finding, and it is far easier to resolve before an offer than during a contract.

Does a spring or a cistern count as an acceptable water source?

Not for FHA financing. Under section II.A.3.a, a property served by springs, lakes, rivers, sand-point wells or artesian wells, or whose source includes a mechanical chlorinator, is not eligible for FHA mortgage insurance. Other programs evaluate unusual sources case by case through the appraiser and the local health authority. Either way, an unusual water source is the first thing to raise, because it is the one item without a straightforward repair path.