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Well Inspection Checklist for Home Buyers

A home with a private well needs a different kind of due diligence than one on municipal water. Here's what to check, ask for, and request before you close, based on EPA, NGWA, and state agency guidance.

Why a Well Needs Its Own Inspection

A standard home inspection typically checks that a well pump runs and that water flows from the tap, but that's a fraction of what actually matters. Public water systems are tested on a regulated schedule under the Safe Drinking Water Act, but that oversight stops at the property line. The EPA puts the responsibility for testing and maintaining a private well squarely on the owner, noting that "private well owners are responsible for delivering safe drinking water to their households." When you buy a home with a well, you're also buying that responsibility, along with whatever the previous owner did or didn't keep up with. That's the gap this checklist is meant to close.

The Checklist at a Glance

Get Current Water Test Results, or Order New Ones

The EPA recommends testing private well water at least once a year for total coliform bacteria, nitrates, total dissolved solids, and pH. Ask the seller when the well was last tested and for the actual lab results, not just a verbal assurance that "the water's fine." If the most recent test is more than a year old, or if the seller can't produce one at all, treat a fresh test as part of your due diligence rather than an optional extra.

The EPA also lists conditions that call for testing right away regardless of the normal schedule: a known groundwater or drinking water problem in the area, flooding or new construction or industrial activity near the well, recent repair or replacement of well system components, or any change in the water's taste, odor, or appearance. Ask the seller directly whether any of these have happened since the last test. Use a state-certified laboratory rather than a generic retail kit alone; your county health department may offer private well testing for free or at reduced cost. For a longer breakdown of what to test for and when to add tests like arsenic or radon based on local geology, see our well water testing guide.

Review the Well's Age, Depth, and Construction Records

Most states require whoever drilled a well to file a construction record, commonly called a well log or well completion report, with a state agency. California is a useful example of how detailed these can be: under California Water Code Section 13751, anyone who constructs, alters, or destroys a well must file a completion report with the Department of Water Resources within 60 days of finishing the work, and the state has built a searchable map application so property owners can look up existing records by address. Not every state's process works the same way or makes records equally easy to find, so ask the seller directly for a copy of the well log, and if they don't have one, contact your state's water resources agency, geological survey, or county health department to search for it.

The well log matters because it's the only record of the well's original depth, casing material, geologic formations it passes through, and initial yield. Comparing that baseline against how the well performs today can tell you whether output has dropped over time, whether the casing is due for attention, or simply how old the well actually is, since "the well looks fine" and "the well is 40 years old" are two different things a home inspection alone won't distinguish.

Check the Pump's Age, Type, and Condition

The National Ground Water Association's homeowner guidance, published through Wellowner.org, describes what a full professional well checkup covers: a flow test, a check of the water level before and during pumping, an evaluation of the pump motor's amp load, grounding, and line voltage, and verification of the pressure tank and pressure switch. That same guidance calls for a concise written report explaining the results, including all lab and other test findings, delivered after the check-up. Ask the seller for the pump's installation date, make and model, and any service records, and consider having a licensed or certified well systems professional run this checkup before you close rather than relying on the pump simply turning on during a walkthrough. Pumps have a finite service life, and a pump nearing the end of its expected run is a repair cost you should be pricing into your offer, not discovering after closing.

Test the Flow Rate (Well Yield)

A well can produce clean water and still not produce enough of it for how you actually live. Penn State Extension's guidance on estimating household water needs recommends sizing a well's flow rate to peak demand rather than average daily use, since most household water use is concentrated into short windows in the morning and evening. Its recommended minimum flow rates by home size give a useful reference point: about 6 gallons per minute (GPM) for a 2-bedroom, 1-bath home, 10 GPM for a 3-bedroom, 2-bath home, and 14 to 16 GPM for a 4-bedroom, 3-bath home, with 5-plus bedroom homes needing 15 GPM or more. If the well's yield falls short of what a home its size needs, water storage, either the borehole itself or a dedicated storage tank, can help bridge the gap, but that's an added cost and complexity worth knowing about before you buy rather than after. Ask for a current flow test as part of your inspection and compare it against your household's likely peak demand, not just the previous owner's.

Ask About Your State's Well Disclosure Requirements

Real estate disclosure law for private wells is set state by state, and there's no single national standard, so what a seller is legally required to tell you varies a lot depending on where the property is. Minnesota is a concrete example of how detailed these rules can get: under Minnesota Statutes Section 103I.235, a seller must disclose the number and status of all wells on the property (in use, not in use, or sealed) and provide a sketch map showing each well's location, and this disclosure has to be made available to the buyer before a purchase agreement is signed. Minnesota also requires well status information on a certificate at deed recording, and sellers who fail to disclose a known well can be held liable for the cost of sealing it and reasonable attorney fees for up to six years after closing.

Not every state has a comparable well-specific disclosure law, and some leave sellers with only a general duty not to conceal known defects rather than a specific well disclosure form. Because this varies so much, ask your real estate agent or a local real estate attorney what your state specifically requires before you assume any disclosure protection applies, and don't treat the absence of a complaint from the seller as confirmation that everything about the well checks out.

Putting It Together

• Get the seller's most recent water test results, or order a new test from a state-certified lab if theirs is missing or outdated.
• Ask whether any flooding, nearby construction, or recent repairs have happened since the last water test.
• Request the well log or well completion report showing depth, construction date, casing, and original yield.
• Ask for the pump's installation date, make, model, and service history, and consider a professional checkup before closing.
• Get a current flow rate (yield) test and compare it against your household's likely peak demand, not the seller's.
• Confirm what your state legally requires the seller to disclose about the well, since this varies widely.

See our well maintenance schedule for what ongoing upkeep looks like once you own the well, or how to hire a licensed well driller if the inspection turns up something that needs a professional look before you close.

Sourced from the EPA's Private Drinking Water Wells program and its Protect Your Home's Water guidance, the National Ground Water Association's homeowner resources at Wellowner.org, Penn State Extension's Water System Planning: Estimating Water Needs, the Minnesota Department of Health's Wells at Property Transfer guidance, and the California Department of Water Resources' Well Completion Reports page. Disclosure requirements vary by state; confirm what applies to your purchase with a local real estate agent or attorney.