What Are FHA's Well Requirements for New Construction?

The site plan is spread across your kitchen table. There is a rectangle for the home, a long shaded box for the septic drain field, and a small circle near the driveway where the well driller plans to set up. Nothing has been dug yet, so the well can still go anywhere on the lot, right up until the rig drills it.

FHA can insure a mortgage on a newly built home with a private well. The well has to be drilled at least 20 feet deep and cased, and placed the required distances from the septic tank, the drain field and the property line. It also has to deliver five gallons per minute over at least four hours and pass a water test taken by an independent party.

I'm Jeff Moran, a mortgage broker in Bluffton, South Carolina, originating since 1996, NMLS #483943, through C2 Financial Corporation, and licensed in fifteen states. I wrote this for you if you are building a home on a well, or buying a new home where the well is being drilled right now. Every requirement below comes from the FHA handbook.

New construction, as FHA defines it for these well rules

These standards are written for new construction. Section II.A.8.i of HUD's Single Family Housing Policy Handbook 4000.1, revised 06/27/2025, covers three situations:

• Proposed construction: no concrete or permanent material has been placed yet. Digging the footings does not count as permanent.
• Under construction: permanent material is in place, and the home is not yet finished and has no certificate of occupancy.
• Existing less than one year: the home is finished, its certificate of occupancy is less than a year old, and nobody has ever lived in it.

FHA treats a home that was finished within the past year and has already been occupied as an existing property. If that is the home you are looking at, or if you are buying an older home that already has a well, my post on buying an existing home with a well and septic system covers that case. The rest of this article is about a well that is new.

How deep does a well have to be for an FHA loan on a new home?

Your lender, which the handbook calls the Mortgagee, "must ensure that new wells are drilled and are no less than 20 feet deep and cased." So the well has to be drilled, it has to reach at least 20 feet, and it has to have a casing.

The casing "should be steel or other casing material that is durable, leak-proof, and acceptable to either the local health authority or the trade or profession licensed to drill and repair wells in the local jurisdiction." In plain terms, steel works, and so does another material that your local health department or your licensed well driller accepts.

The same section adds one more placement rule. A well located inside the foundation walls of a new home is not acceptable, except in arctic or subarctic regions. Outside those places, the well belongs out in the yard, away from the footprint of the home.

How far does a well have to be from a septic tank for an FHA loan?

The handbook lists the minimum distance between the new well and each possible source of pollution. Its table cites the federal minimum property standards at 24 CFR § 200.926d(f)(3)(iv).

Between the well and	Minimum distance
The property line	10 feet
The septic tank	50 feet
The absorption field (the septic drain field)	100 feet
A seepage pit or cesspool	100 feet
Sewer lines with permanent watertight joints	10 feet
Other sewer lines	50 feet
Chemically poisoned soil	25 feet, reduced to 15 feet where a layer of clay, hardpan or rock that water cannot pass through (the handbook calls it impervious strata) protects the ground
A dry well	50 feet
Anything else	The local health authority's minimums

A footnote under the table says "distance requirements of local authority prevail if greater than stated above." So the FHA figures are the minimum, and if your county required 75 feet from a septic tank, then 75 feet would be your number. I would ask your septic designer and your well driller to confirm the larger figure for each line before the site plan is final.

Termite treatment on a new home can bring the chemically poisoned soil distance into play. The same handbook section lists soil chemical termiticide as one of the termite treatments used on new construction. You'll want to ask your builder where and how the soil around the foundation will be treated, so the well can be planned with that distance in mind.

What flow rate does FHA require for a new well?

The handbook's second table, which cites 24 CFR § 200.926d(f)(1) and (2), sets four standards for the water system itself:

1. Lead-free piping.
2. State water quality standards apply where there are no local chemical and bacteriological standards.
3. Connection to public water whenever feasible.
4. The well must deliver water flow of five gallons per minute over at least a four-hour period.

If a public water line can feasibly reach your lot, the standard calls for connecting to it. That is worth asking your builder and the local water utility about before you budget for drilling.

The fourth item is about sustained supply. A well that gushes for ten minutes and then fades does not meet it. The handbook section states the standard and does not say who measures it or on what form. I would ask your well driller how they test and document the yield, and I would ask your lender which document they want to see, so both answers are settled before the rig shows up.

The water test, and who is allowed to take the sample

A well water test is required for every newly constructed home with a well, and the handbook is strict about who handles it. All testing must be done by a disinterested third party, and that includes collecting the sample and carrying it to the lab.

The sample has to be collected and tested by the local health authority, a commercial testing laboratory, a licensed sanitary engineer, or another party the local health authority accepts. The handbook then rules out everyone with a stake in the sale. You, as the future owner, may never collect or transport the sample, and neither may any other Interested Party.

FHA's own definition of an Interested Party, in section II.A.4.d of the same handbook, includes sellers, real estate agents, builders and developers. So on a new home, neither the builder nor you can collect or carry the sample.

Your lender then submits a valid water test from the local health authority or a qualified lab, and the report may not be more than 180 days old from the disbursement date.

The steps, in the order I would take them

1. Public water first. Your builder and the local water utility can tell you whether a public line can feasibly reach the lot, and that answer decides whether a well is part of the plan at all.
2. The local setbacks, in writing. You'll want to ask your local health department for its own well and septic distances. Wherever one of them is larger than the FHA figure, the larger one applies.
3. Every distance on the site plan. The plan should show how far the planned well is from the property lines, the septic tank and the drain field. It should also show any seepage pit, dry well, sewer line or termite-treated soil nearby.
4. Four specifics with your well driller. Those are drilling to at least 20 feet, the casing material, lead-free piping, and how the five gallons per minute over four hours will be tested and written up.
5. The well outside the foundation. Unless you are building in an arctic or subarctic region, the well cannot be inside the foundation walls.
6. The water test, timed to the closing. It has to come from an independent party, and it cannot be more than 180 days old from the disbursement date.
7. The builder's paperwork. The handbook lists form HUD-92541, the Builder's Certification of Plans, Specifications, and Site, along with the well water analysis and a septic report where the local jurisdiction requires one.

If the home is 90 percent complete or less when the appraisal is assigned, the handbook also has your lender give the appraiser the floor plan and the plot plan. If you are still sorting out how a build is financed, how a construction-to-permanent mortgage works walks through the draws and the conversion.

Mistakes I would plan around

Placing the well after the septic design is final. The drain field needs a lot of room, and its 100-foot circle covers a big piece of a small lot. Clients do better when the well and the septic system are drawn together, on the same sheet, by a designer and a driller who are talking to each other.

Using the FHA distances when the county's are larger. The FHA table is the minimum. The footnote under it says the local authority's distances prevail when they are greater.

Letting the builder pull the water sample. The handbook does not allow it, and a sample collected by the builder, the seller, an agent or you does not count.

Testing too early on a long build. The report can be no more than 180 days old from the disbursement date. Builds often run longer than the first schedule, so it helps to time the test against the expected closing date.

If you are buying from a builder who offers an in-house lender, whether to use the builder's lender on new construction covers how to compare that offer. And if the home comes with real acreage, buying a home on acreage explains what the appraisal does with the land.

An illustration, so the sequence is clear

The details below are made up to show the mechanism.

A couple is building on a one-acre lot with an FHA loan. The septic designer places the drain field at the back of the lot, and the builder's first sketch puts the well in the back corner too, for a short pipe run to the garage. Once they measure it, the well is 70 feet from the edge of the drain field. The FHA table requires 100 feet, and the county requires the same. If the well had already been drilled there, fixing it would have meant drilling a second well.

Nothing has been drilled yet, so they move the well on the site plan to the front yard, 110 feet from the drain field, 60 feet from the septic tank and 15 feet from the side property line. The driller plans a cased well drilled to 140 feet and agrees to document a four-hour yield test. The county health department draws the water sample after the well is finished, and the closing is scheduled about two months later, well inside the 180-day window.

Your next step

FHA purchase loans are priced in Rate & Best Fit on the homepage, and you can see pricing for your own scenario without a credit pull or an account. Once you see the options, you can choose a rate option that works best for you, and that selection can change as the file comes together. If you are planning a build and would like a second set of eyes on the well and the site plan, you are welcome to call me.

The FHA loan guide explains the program itself, and how an appraisal works covers the appraiser's side. The mortgage products overview lists every loan I originate.

Nothing here is a loan approval, a denial, or a commitment to lend.

Common questions

How far does a well have to be from a septic tank for an FHA loan?

On new construction, FHA's handbook section II.A.8.i, citing 24 CFR § 200.926d(f)(3)(iv), requires at least 50 feet between the well and the septic tank and at least 100 feet between the well and the absorption field, or drain field. A seepage pit or cesspool also needs 100 feet. If the local health authority requires a greater distance, the local distance applies.

How deep does a well have to be for an FHA loan on a new home?

FHA's handbook requires a new well to be drilled, at least 20 feet deep, and cased. The casing should be steel or another durable, leak-proof material that the local health authority or the licensed well-drilling trade in your area accepts. The well also cannot be inside the foundation walls of a new home, except in arctic or subarctic regions.

What flow rate does FHA require for a well on new construction?

Five gallons per minute over at least a four-hour period. FHA handbook section II.A.8.i lists that standard, citing 24 CFR § 200.926d(f)(1) and (2). The same table calls for lead-free piping and a connection to public water whenever that is feasible. Your well driller and your lender can tell you how the yield will be tested and documented.

Can the builder take the water sample for an FHA well test?

No. For newly constructed homes, the well water test has to be done by a disinterested third party, including collecting and carrying the sample. That means the local health authority, a commercial lab, a licensed sanitary engineer, or another party the local health authority accepts. FHA's definition of an Interested Party includes builders, sellers, agents and developers, and the handbook says the owner and Interested Parties may never collect or transport the sample.

How old can the well water test be on an FHA new construction loan?

The handbook says the water test report may not be more than 180 days old from the disbursement date. On a build that takes several months, a test taken right after the well is finished can expire before closing, so it helps to time the test against the expected closing date.

Do these FHA well distances apply when I buy an older home with a well?

These figures come from FHA's new construction section, so they are written for a well being built now. A home finished within the past year that someone has already lived in is treated as an existing property. For an older home with a well, my post on buying an existing home with a well and septic system covers what a loan asks of it.