FHA Water Test Requirements for a Private Well

When FHA requires a well water test

FHA water test requirements for a well are in HUD's Single Family Housing Policy Handbook 4000.1, in the section on underwriting the property, under "Water Supply Systems". The handbook says a well water test is required for, but not limited to, properties:

1. that are newly constructed;
2. where an appraiser has reported deficiencies with the well or the well water;
3. where the water is reported to be unsafe or known to be unsafe; or
4. that are located in close proximity to dumps, landfills, industrial sites, farms (pesticides) or other sites that could contain hazardous wastes.

The words "not limited to" matter. The list is the minimum, not the whole story, so a lender or your local health authority may still ask for a test on a home that matches none of the four. If you are buying a home with a well, ask your lender early whether it will want a test, even if the appraisal has not flagged anything yet.

The handbook does not define "unsafe" with its own numbers. It measures the water against the requirements of the health authority with jurisdiction, which the standards section below explains.

Water sources FHA will not insure

Some water supplies rule a home out before any test is taken. HUD's handbook says that if the property has a water source that includes a mechanical chlorinator, or is served by springs, lakes, rivers, sand-point wells, or artesian wells, the property is not eligible for FHA mortgage insurance.

If the home you want uses one of these sources, talk to your lender before you spend money on a water test, an inspection or an appraisal. A passing water result does not change the eligibility of the source itself.

FHA vs VA in one line: HUD's handbook makes a home served by springs, lakes, rivers, sand-point wells or artesian wells ineligible for FHA insurance, while VA's Pamphlet 26-7 accepts those sources once the appraiser comments and the Veteran acknowledges them in writing. Our page on VA water test requirements covers VA's rules.

What standard the water must meet

FHA does not publish its own water standard. HUD's handbook says that when a home has an individual water supply, such as a well, the lender must make sure the water quality meets the requirements of the health authority with jurisdiction. If there are no local or state water quality standards, the water must meet the standards EPA sets in the National Primary Drinking Water Regulations, 40 CFR parts 141 and 142.

EPA describes those regulations as legally enforceable standards and treatment techniques that apply to public water systems. HUD's handbook borrows them as the fallback for a well when no local or state standard exists.

In practice, your local health authority, usually a county or city health department, and your lender decide which tests count for the loan. Requirements are set by your local health authority (or EPA standards where none exist); confirm with your lender. Ask your lender for the list of tests in writing, and confirm it with the local health authority before the sample is taken.

For the yearly tests every well owner should consider, beyond what a loan asks for, see our well water testing guide. If you are still weighing the purchase, our guide to moving to a house with well water covers what to test, who should take the sample and how to time it in the contract. Our bacteria water test guide explains how a bacteria sample is collected and how quickly it has to reach the lab.

Who can collect and test the sample

HUD's handbook says all testing must be performed by a disinterested third party. That includes collecting the water sample at the water supply source and transporting it to the lab.

The handbook names who may collect and test the sample:

• the local health authority;
• a commercial testing laboratory;
• a licensed sanitary engineer; or
• another party that is acceptable to the local health authority.

It also says who may not: at no time will the borrower or owner, or another interested party, collect or transport the sample. In plain terms, you cannot take the sample yourself for an FHA loan, and neither can the seller. If you are not sure whether someone counts as disinterested, ask your lender before the sample is taken.

Line up the collector as soon as you have a contract. Some health departments collect samples themselves, and some labs send their own staff. Ask whoever does it to record who collected the sample and when.

How far the well must be from pollution sources

HUD's handbook sets minimum distances between a well and sources of pollution for existing homes. The table below shows them as printed in HUD Handbook 4000.1, Update 18, last revised 2026-08-12.

Three more rules come with the table:

• Drain field reduction. The septic tank drain field distance can be reduced to 75 feet^[1] if the local authority allows it.
• Neighboring land. If the property line is next to a residential property, local well distance requirements prevail. If it is next to a nonresidential property or a roadway, the well needs a separation of at least 10 feet^[1] from the property line.
• Local rules can be stricter. The distance requirements of the local authority prevail if they are greater than the ones in the table.

For new homes, the handbook points to the well location rules in 24 CFR 200.926d. If you are buying a newly built home with a well, ask your lender and builder how those rules were met.

If the home is on public water

If the home is connected to a public water system, the handbook treats the water differently. It says that when a public water supply system is present, the water quality is considered to be safe and potable and to meet the requirements of the health authority with jurisdiction unless:

• the appraiser indicates deficiencies with the water or tells the lender that the water is unsafe; or
• the health authority with jurisdiction issues a public notice indicating that the water is unsafe.

The handbook also says the lender must confirm that the home is connected to a public or community water system whenever that is feasible and available at a reasonable cost. If the connection cost is not reasonable, an existing onsite system is acceptable as long as it is working properly and meets the requirements of the local health department.

If your water result raises a health question for someone in the home, talk to a health professional. Choose any treatment only from a certified lab result; if the result meets the local requirement, no treatment is needed. To find a certified lab near the home, see our state lab pages, or build a test plan for your home in a few questions.