Well and septic inspection: what each one checks, who may do it, what it costs and what home sales require

The short answer: a well inspection is a licensed well professional's look at the hardware: the cap, the casing and how high it sits, the seal around it, the distance to the septic system, the pump and pressure tank and, if you ask, how much water the well delivers. A water test is a different thing: a certified lab analyzes a sample. Buying a house with a well, you usually want both, because a clean water test from a cracked well only describes the day the sample was taken. A "well and septic inspection" adds a third check, of the wastewater system, which is done by a septic professional and is required at sale in some places, such as Massachusetts and King County, Washington.

Of the seven states we checked, only New Jersey requires a water test at a sale and none of the official pages we read requires a well inspection; Connecticut, Minnesota and Vermont have disclosure or notice rules; FHA and VA loans add their own rules about who may collect the sample.

Well inspection vs. water test

People use "well inspection" for either one. Each misses what the other catches.

Wisconsin joins the two: if you choose a sale inspection, the licensed inspector must also sample for coliform bacteria (including E. coli), nitrate and arsenic for a certified lab, and "may not ask someone else to collect the samples" (Wisconsin DNR).

Well and septic testing: what each test covers

A "well and septic test" is really three checks, and only one of them happens in a lab. Each looks at something the other two can't:

The water test is the only one of the three that can show signs of the septic system reaching the well, though no single result proves the septic system is the source. EPA's list of signs of a failing septic system ends with "High levels of nitrates or coliform bacteria in surface waters or drinking water wells" (EPA, Resolving Septic System Malfunctions), and the Vermont Department of Health says: "If you think the contamination is from a septic system or animal manure, we recommend that you have the water tested for nitrate and chloride" (Vermont Department of Health, Coliform Bacteria). Which combinations of nitrate, chloride and bacteria results point to septic influence is explained in septic systems and well water. The two inspections are described below.

What a well inspection checks

There is no national checklist. The most detailed public one is Wisconsin's required inspection form (DNR Form 3300-221), which lists 25 features checked against the state well code, NR 812. Minnesota's health department lists the defects it sees most; Penn State Extension and EPA describe what owners should look for.

Cap, casing and casing height

The casing is the pipe that holds the well open down to the water-bearing layer, and its top end is the usual weak point. The Minnesota Department of Health (MDH) lists the common defects as "a loose or damaged well cap, a cracked well casing, settlement of soil around the well casing, and an open space around the well casing" (MDH, Wells at Property Transfer, updated September 30, 2025). EPA's owner checklist names cracked or corroded casing, a broken or missing cap, and "settling and cracking of surface seals."

Required casing height depends on the state, and in Wisconsin on the well's age:

• Minnesota: the casing top must stay "at least 12 inches above ground level" and can't be cut off or buried for landscaping or a driveway (MDH).
• Wisconsin: noncomplying if less than 8 inches above outside grade for a well installed before February 1, 1991, or less than 12 inches for one installed on or after that date; wells in a flood fringe need the top at least two feet above the regional flood elevation (Wisconsin DNR, Pub. DG-092).
• Pennsylvania: Penn State Extension advises at least 8 inches "or high enough that surface water will never enter the well (even in times of flood)." That is Extension guidance, not a state requirement.

Wisconsin also requires a vermin-proof cap or one-piece seal on outdoor wells, and pump wires in conduit at the wellhead, because otherwise "mice and insects can enter the well."

The seal you can't see

MDH explains the hidden part: once the casing is set, "the space between the hole and the casing is filled with a material called 'grout' to prevent surface contaminants from entering the aquifer." A standard inspection is visual, and Wisconsin says features "such as well casing depth" are buried and "cannot be seen without opening the well, excavating, or conducting a records search." Opening the well or running a camera costs extra and isn't part of a Wisconsin transfer inspection. The well's construction record (see the checklist below) is often the only proof of casing depth.

Setbacks from the septic system

Every state sets minimum distances between a well and things that can leak into the ground, and the inspector checks them against your state's code. In 26 of the 36 states whose rules we read, a private well must be at least 50 feet from the septic tank; 100 feet is the most common drainfield distance (23 states), and some states double it for shallow or short-cased wells. Our well and septic setback distances by state table gives each state's tank, drainfield and seepage-pit numbers with the rule section. If your well is closer than your state's minimum, see septic systems and well water for which tests to order.

FHA's handbook (as revised August 12, 2026) still prints minimum distances for existing homes, charted below. But under FHA INFO 2026-17 (July 27, 2026), FHA waives them for existing homes when the property "meets the distance requirements of the local jurisdiction" and "acceptable water testing results are documented by the mortgagee." The waiver does not cover new construction. Ask your lender which rule it applies.

A "well and septic inspection" is really two inspections. The well inspector measures the distance to the tank and field; the septic system's condition is a separate job. MDH notes that an "individual septic system disclosure" may also apply at a Minnesota sale.

Pump, pressure tank and piping

Wisconsin's inspection covers the pressure system but "does not include the plumbing distribution system or electrical code requirements." Items on its form that buyers rarely think of:

• A buried suction line or a misplaced check valve, either of which can draw contaminants into the piping.
• Cross-connections between well and sewer piping, which Wisconsin says "can and have caused disease outbreaks."
• A missing sample faucet at the pressure tank, which lets a lab sample come straight from the well.
• A pre-1979 two-wire submersible pump, flagged because some contained PCBs.

Flow and yield

Wisconsin's inspector "may note" well or pump yield but isn't required to, and the DNR adds that "no one can predict when a pump or pressure tank will fail or when groundwater levels will drop." MDH says buyers "may also be advised" to evaluate how much water the system produces, since demand may change under new owners. FHA's handbook (August 2026) sets numbers: existing wells "must deliver a continuous water flow at a minimum of three gallons per minute"; wells for new construction, "a continuous water flow of five gallons per minute over at least a four-hour period." Ask whether a flow test is included.

Unused wells

Wisconsin's inspection "must include a search for any unused or noncomplying wells," and the DNR warns that if an aquifer or a neighbor's well is contaminated through an unsealed unused well, "the well owner could be held responsible." In Wisconsin a well out of service for more than 90 days (seasonal wells excepted) must be filled and sealed by a licensee; in Minnesota a well "not in use" must be put back in use, sealed by a licensed contractor, or covered by a maintenance permit. How to find an old well, other states' sealing rules, costs and grants are in our old water well guide.

What a septic inspection checks

The well inspector measures how far the well sits from the tank and drainfield. Whether the septic system itself works is a separate inspection, by a septic professional, and it matters to the well: Penn State Extension notes that a failing system "can also be a pollution source for private water systems, ponds, and streams on or adjacent to the property" (Penn State Extension, On-Lot Septic System Inspections During Real Estate Transactions, updated March 11, 2026).

For routine care, EPA says "the average household septic system should be inspected at least every three years by a septic service professional," that household tanks "are typically pumped every three to five years," and that alternative systems with float switches, pumps or mechanical parts "should be inspected more often, generally once a year." On a service visit, the provider "will inspect for leaks and examine the scum and sludge layers in your septic tank" (EPA, How to Care for Your Septic System, updated August 17, 2026).

A real-estate septic inspection goes further. The standardized one Penn State describes covers the septic tank, the distribution pipes, the drainfield (soil treatment area) and parts such as dosing pumps and alarms, and the report states:

• the type and characteristics of the system;
• the condition of the tank, distribution system and drainfield;
• whether the tank and drainfield can handle wastewater "based on the future occupancy (i.e., number of people) of the home";
• potential problems or "red flags" that need more testing, and a list of corrective measures.

The tanks are pumped during that inspection. The inspector may also require a hydraulic load test, which checks whether the drainfield can take the home's expected daily wastewater, when normal flow can't be confirmed (for example, a home vacant more than a week or a tank pumped less than 30 days before), when the drainfield isn't absorbing effluent, or when conditions are unclear. Penn State is plain about the limits: the inspection is not "a warranty or guarantee that the system will properly function for any period of time in the future."

Septic rules at a home sale

Elsewhere, ask your county health department what applies, since King County's rule is a county rule. Put the septic inspection in the same contingency as the well inspection and water test, since a failing system is one of the things that can pollute the well next to it.

Who does well and septic inspections

The well and the septic system are inspected separately, and each has its own licensing rules, which differ by state and sometimes by county.

Well inspections

If you are searching for well water inspectors, check the license first:

• Wisconsin: "only a licensed water well driller or licensed pump installer may make a statement, for compensation, at time of property transfer regarding the location, compliance, condition, capacity or performance of a well and pressure system." The DNR warns "a home inspector may not have the required license," and keeps a county list of licensees. Collecting water samples alone needs no license.
• Minnesota: the state doesn't inspect wells at sale; "well contractors and some professional inspectors may inspect wells and water systems." Building or repairing a well requires a license (owners working on a domestic or farm well on their own land excepted), and only a licensed contractor may seal one.
• Pennsylvania: drillers are licensed under the Water Well Drillers License Act of 1955, and DCNR keeps a licensed-driller database. Yet "there are no state regulations that require private well owners to maintain their well or test their drinking water" (Penn State Extension).

Elsewhere, your state well program or county health department can tell you who is licensed.

Septic inspections

• Massachusetts: "Only MassDEP-approved individuals can conduct system inspections," and inspections by anyone else "are not valid for compliance with Title 5" (MassDEP, Buying or Selling Property with a Septic System).
• King County, Washington: a "certified on-site system maintainer" (Public Health – Seattle & King County).
• Pennsylvania: Penn State says a real-estate inspection "must be performed by a trained and certified septic system inspector," and that your county Extension educator can help you find one. A municipal Sewage Enforcement Officer's inspection is a different, regulatory check.

When to get a well inspected

• Buying a home. Penn State Extension says to "find out how old the well is, what type of well it is, where it is located, and if it is properly sealed," identify potential contaminants, make sure wastewater disposal is safe, and test the water before purchase.
• After a flood. EPA says to stay away from a flooded pump, not to drink or wash with the water, and to "get assistance from a well or pump contractor to clean and disinfect your well before turning on the pump." For inspecting and testing afterward it sends you to your state or local health department.
• When bacteria come back. MDH says if coliform persists after disinfection, "a licensed well contractor should inspect the well for structural problems." See coliform bacteria.
• After repairs. EPA says to test immediately when you replace or repair any part of the well system.
• Routinely. Penn State recommends a professional inspection "at least every 10 years."

Home-sale rules by state

These are the rules we verified on official pages. Each state's requirement is its own:

New Jersey's required list, per the state health department's fact sheet (updated January 2023): total coliform and fecal or E. coli bacteria, VOCs ("includes 29 different chemicals"), nitrate, lead, arsenic, synthetic organic chemicals, PFAS (PFNA, PFOA, PFOS), iron, manganese and pH, plus mercury in 9 counties and gross alpha and uranium in 12, through labs certified for PWTA sample collection.

Connecticut's law says a missed notice "shall not invalidate any sale," so don't treat it as protection; ask for records yourself. Minnesota's cuts the other way: a seller who hides a known well or misstates its status "may be liable to the buyer for costs related to sealing the well and reasonable attorney fees" if the buyer sues within six years of closing. Elsewhere, Washington's advice applies: "Contact your local county health or planning department for information on the requirements and the testing needed."

What FHA and VA loans require

The FHA, VA and USDA rules are quoted side by side, with section numbers, deadlines and who pays, in well water test requirements for FHA, VA and USDA loans. Four points bear on the inspection itself:

• Standard. Both FHA (HUD Handbook 4000.1, last revised August 12, 2026) and VA (VA Pamphlet 26-7, Chapter 12) want the water to meet the local health authority's requirements, with EPA standards as the fallback. Those EPA standards are written for public water systems and don't legally bind a private well.
• Sampler. Neither lets the buyer, owner or any interested party collect or transport the sample (see the callout above).
• Test age. FHA accepts a report up to 180 days old at disbursement; VA counts results valid for 90 days from the health authority's certification date, so a VA test can expire if closing slips.
• Water source. FHA treats a property whose water comes through a mechanical chlorinator, or from a spring, lake, river, sand-point or artesian well, as not eligible for FHA mortgage insurance; VA accepts several such sources with the Veteran's signed acknowledgment.

FHA has said more property-requirement changes are coming, so ask your lender for the current list.

What's in a "loan test"? The Wisconsin State Laboratory of Hygiene sells a HUD/FHA-VA Loan Package (total coliform, E. coli, lead, nitrate, nitrite) for $146, prices effective July 1, 2026, and its price list says HUD "requires the tests listed" and the VA "has the same requirements." That is the lab's summary, not HUD's text. MDH says lenders typically ask for coliform and nitrate. Your loan officer's condition letter is the list that counts.

Buying a house with a well and septic: checklist

Records to request

MDH tells buyers to ask for "copies of well construction records (Well and Boring Records) and well sealing records (Well and Boring Sealing Records), water testing reports, and repair or maintenance records." The construction record, or well log, gives depth, casing and geology. You can often look it up:

• Minnesota: the Minnesota Well Index. Records were required starting in 1974, so the "majority of wells constructed prior to 1974 will not be on file," and most sealing records aren't in it either.
• Wisconsin: construction reports have been required since 1936 and are searchable on the DNR site, though older ones may be missing or too vague to match an address.
• Pennsylvania: the PA Groundwater Information System holds "hundreds of thousands of water well records"; some are just a scanned image and basic data.
• Washington: Ecology's Well Report Viewer, where locations are accurate only "to the nearest township, section, and range."

No record doesn't mean no well. For other states' well-log databases and where septic permits and records are kept, see finding well and septic records.

Questions to ask the seller

1. How old is the well, what type (drilled, driven point, dug), and where exactly is it?
2. When was the water last tested, by which certified lab, and may I see the full report?
3. What was any treatment equipment installed to remove? Are there other wells on the property, used or not? Is there a sealing record for any?
4. Where are the septic tank and field, and when were they last pumped or inspected?
5. Has the well ever run dry, lost pressure, flooded or tested positive for bacteria?

Order of steps

1. Put the well inspection, the septic inspection and the water test in the inspection contingency, with time for lab turnaround.
2. With an FHA or VA loan, get the lender's test list and accepted samplers first.
3. Ask the well contractor what the visit covers: wellhead, setbacks, pressure system, unused-well search, flow test, sampling.
4. Test the raw water for at least coliform bacteria and nitrate (on the MDH, Washington and Wisconsin lists), plus local concerns such as arsenic. Find a certified lab with our lab finder.

Reading the inspection report

A Wisconsin report is the easiest to read because the form is standard: a checked box means "the inspector has identified noncompliance or a possible concern with that feature." The DNR's companion guide explains each item and whether it can be fixed:

Worked example (illustrative). A Wisconsin report for a 1998 drilled well checks "casing height," noting 9 inches above grade, and the coliform result is positive. For a well built after February 1, 1991, under 12 inches is noncomplying: the "casing height too low" row. The fix is to extend the casing if the buried depth meets code, which the well log may show; otherwise the well is opened at extra cost. For the bacteria, follow MDH: disinfect, retest, and if coliform persists, have a licensed contractor look for structural defects.

Two cautions from the DNR. "Test results may detect a contaminant, but this does not mean the well is noncomplying," so a clean inspection and a bad water result can coexist. And "there is no state requirement to bring a well and pressure system into compliance to sell a property": fixes are negotiated, though "a lender may require noncompliance to be corrected." For the water report, use the results checker and our pages on nitrate and coliform bacteria.

What it costs

We found no official fee schedule for well inspections; contractors set prices, so get a written scope and quote. For the septic inspection and the water test, these are the figures published by an extension service, a state agency or a state lab:

Penn State adds that the final septic price "may be higher or lower depending on local rates, site conditions, and complexities," and that the inspection cost and needed repairs "can often be negotiated into the real estate transaction."

Lab-by-lab prices, rush fees and sample deadlines are in our well water testing cost guide.

After you move in

MDH: "The property owner is responsible for the testing, maintenance, repair, and sealing of any well(s) on the property." Penn State suggests a well record book, which "can also be helpful to any future owners of the home." Then plan yearly testing with our which-tests checklist.

Questions people ask