Well Inspection and Water Testing: An Add-On Guide

Short answer: A well inspection has two parts: a visual check of the well and water system, and a water sample sent to a state-certified lab. Private wells are not regulated under the federal Safe Drinking Water Act or by most states, so the rules that matter come from your state, a few sale-time laws such as New Jersey's, and the FHA, VA and USDA loan handbooks. Sell it as its own service with its own agreement terms, sample chain and report.

EPA estimates that around 15 percent of the U.S. population, over 43 million people, rely on private wells for drinking water. If you inspect in areas served by private wells, you are already being asked whether the water is safe. This guide covers what it takes to answer that properly as a paid service, not a favor.

What a well inspection covers

No law or government agency sets a national standard for a home-sale well inspection. The closest thing is an association document: InterNACHI publishes Well Inspection Standards of Practice, and it runs a Certified Well Inspector designation for its members. Neither is a state license. Whichever standard you adopt, define the scope in writing and name the standard in your agreement. Most inspectors split the work into two parts.

The system. The parts you can see: the wellhead and cap, casing condition, the grade around the well, visible distance to the septic system and other pollution sources, the pressure tank, pressure switch, gauges and any treatment equipment. EPA's guidance to well owners lists "cracked, corroded or damaged well casing," "broken or missing well cap," and "settling and cracking of surface seals" as problems to look for.

The water. A sample collected under the lab's instructions and analyzed by a state-certified laboratory. You collect and deliver the sample. The lab produces the numbers. You do not interpret lab results beyond what the lab report says, and you do not tell a client the water is "safe."

Some inspectors also run a flow check. InterNACHI's Well Inspection Standards of Practice include one: a well pump flow test of at least two hours, which may be stopped early if the well appears to be running dry. The report gives the total gallons pumped and the average flow in gallons per minute. The same document says yield, recovery rate, flow rate and static water level depend on the time of year, weather and other variable conditions, and that the test is not a guarantee of a continuous water supply. If you offer a flow test, name the method you follow and say what it does not tell the client.

Who regulates private wells

This is the question clients ask and the one most inspectors answer wrong.

EPA states that the quality and safety of water from private domestic wells "are not regulated by the Federal Government under the Safe Drinking Water Act nor by most state governments and laws," and that "private well owners are responsible for delivering safe drinking water to their households." EPA's state programs page adds that "most states have zero or limited regulations for private drinking water wells." CDC says the same: "Government officials do not regulate, treat, or monitor tap water from private wells."

What states usually do regulate is well construction and the people who build wells. The National Ground Water Association runs a voluntary contractor certification and says 14 states and two counties use its exams, to some extent, in their well construction licensing. New Jersey is a good example of the split: NJDEP regulates the construction of private wells, and "post construction regulation of private wells is the responsibility of the local health department."

Before you sell well inspections, find your state's program through EPA's state list and read your state and county rules. That is where your scope limits and any licensing questions live.

What EPA and CDC say to test for

EPA and CDC give the same baseline. EPA: "Test your private well annually for total coliform bacteria, nitrates, total dissolved solids, and pH levels." CDC adds that owners should ask their health department which other contaminants are common locally. Both say to use a certified lab. EPA: "Only use laboratories that are certified to do drinking water testing."

EPA also publishes a list of conditions that should prompt extra tests. This is the table to build your add-on panels from:

A practical offer is a base panel that matches the EPA and CDC annual list, plus add-ons driven by what you see on site and what your health department flags locally. If radon in water is a regional concern, link it to your radon testing service.

New Jersey: testing is required at sale

New Jersey is the clearest example of a state that requires testing when a property changes hands. Under the Private Well Testing Act, as of September 2026:

• Testing is required on the sale of any property that gets its drinking water from a private well on the property, including new construction. Landlords must test every five years.
• The sample is of untreated water, for up to 43 parameters, including total coliform, nitrates, pH, iron, manganese, lead, arsenic, gross alpha, PFOA, PFOS, PFNA, VOCs and some synthetic organic compounds. Mercury and uranium apply only in listed counties.
• The sample "must be collected by an individual that is certified to collect PWTA samples; or by an authorized representative of a laboratory." pH samples must be collected by an employee of a lab certified for pH.
• Closing "may not occur unless both the buyer and seller have received and reviewed a copy of the water test results" and signed a certification.
• Results can be reused for one year, but total coliform results are valid for only six months.
• NJDEP estimates the average lab price at $1,200 to $1,500.

If you inspect in New Jersey, you cannot simply pull a bottle from the kitchen tap and call it a PWTA test. You either become a certified sample collector or you coordinate with a certified lab. NJDEP also notes that home inspectors are among the professionals who may collect the GPS coordinates labs need, if they follow the DEP's GPS rules.

Other sale-time rules and the loan handbooks

Minnesota does not require a water test at sale statewide, according to the Minnesota Department of Health, though Dakota County requires one by local ordinance. The state does require disclosure. Under Minnesota Statutes 103I.235, before signing a sale agreement the seller must disclose in writing "the status and location of all known wells on the property," and whether each is in use, not in use or sealed. That disclosure is a useful document to ask for before you arrive.

Government-backed loans add their own water rules, covered in detail in our guide to FHA, VA and USDA criteria. The points that shape a well service:

• FHA requires water quality to meet the local health authority's standard, or EPA's drinking water regulations if there is none, and a pressure tank of at least 42 gallons or an equivalent device. It lists triggers for testing, such as a treatment system, corroded pipes, or a landfill, gas station or dry cleaner within a quarter mile.
• VA requires all testing, "including collecting and transporting the water sample," to be done by a disinterested third party. Results are valid for 90 days unless the local authority says otherwise.
• USDA requires analysis by "the local health authority or a state certified laboratory," no more than 180 days old at loan closing.

Your sample schedule has to fit those windows. A test run too early for a slow closing may need to be repeated.

Sampling and the lab chain

The lab result is only as good as the sample. Treat the chain as part of your service, and write it down.

1. Use the lab's kit and instructions. Bottles, preservatives, hold times and sampling order come from the lab. Follow them exactly.
2. Sample untreated water when the rules require it. New Jersey requires sampling before any treatment equipment, from a cold, non-aerated tap, after flushing. Note any treatment system in your report either way.
3. Record the chain of custody. Who collected, when, from which tap, and when the lab received it. Most labs supply a form.
4. Meet the hold time. Ask the lab for the hold time on every analysis, especially bacteria. Plan the lab drop before you plan the inspection.
5. Deliver the lab report, not your summary of it. Attach the certified lab's report. If you add a summary, quote the lab's comparison to standards rather than your own judgment.

CDC's advice for owners is a useful line to include in your report: "Your health department can help you understand your test results and what to do next."

Liability: where well work goes wrong

A well service adds exposure a home inspection does not have. Talk to your E&O carrier before you add it; our guide to home inspector insurance lists the questions. Then close the gaps in your paperwork.

• Promising "safe water." A lab report says what was in one sample on one day. EPA recommends retesting annually and after flooding, repairs or a change in taste, color or odor. Say so in the report.
• Scope creep into well construction. Pulling the pump, opening a sealed casing or disinfecting the well is contractor work. EPA tells owners to "hire a certified well driller for any new well construction, modification, or abandonment and closure." Refer it.
• Sample handling errors. A missed hold time or a contaminated bottle is your error, not the lab's. Your agreement should say what happens if a sample must be retaken.
• Rules you did not know about. In New Jersey, a sample not collected by a certified collector does not satisfy the law. Check state rules before the first job.

Put the well scope, the lab you use, the parameters, turnaround and limitations in your inspection agreement or a separate addendum.

Pricing the service

Well work has a real cost structure, and the lab fee is only part of it. Use the method in our guide to pricing ancillary services.

Offer panels, not a single price. A base panel following the EPA and CDC list, and add-ons for lead, arsenic, radon, VOCs or whatever your area needs. In New Jersey, use NJDEP's own estimate of $1,200 to $1,500 for the lab work as a reality check when clients compare prices.

In Binsr, pricing rules can key off a custom booking question such as "Does the property have a private well?", so the answer sets the price, and the same rule extends the calendar block for the extra time on site.

Report it separately

A well inspection deserves its own report, not a paragraph buried in the plumbing section. The lab results arrive days after your home inspection report, and agents and lenders need to find them quickly.

In Binsr, one inspection can produce multiple reports, each with its own template. The home inspection goes out on time, and the well report sits in the same inspection, hidden from the client or locked until the lab report is in. Photos of the wellhead, tank and treatment equipment attach to the exact finding they support, and the Report Builder works offline, which matters at rural properties with no signal. See the features page.

Frequently asked questions

Keep reading

• FHA, VA and USDA inspection criteria
• How to become a septic inspector
• Radon testing for home inspectors
• Sewer scope inspections
• How to price ancillary inspection services

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