If you’re selling a Nantucket property served by a private drinking-water well, water testing belongs on the transaction checklist early—not a few days before closing.

Nantucket’s updated Private Drinking Water Well Regulations took effect on January 1, 2024. Under the current local rules, the owner must test the water from each private drinking-water well before selling, conveying, or transferring the property. The required testing includes PFAS, and the water-quality results must be submitted to the Nantucket Board of Health.

That makes well testing more than a general recommendation for Nantucket sellers. It is a local property-transfer requirement.

Key takeaway: If a Nantucket home has a private drinking-water well, arrange the required testing well ahead of closing. PFAS analysis can take considerably longer than routine water testing, so waiting until the transaction is nearing completion may create an avoidable scheduling problem.

What Well Water Testing Is Required When Selling a Nantucket Home?

Massachusetts does not have a single statewide testing requirement that applies to every private-well property sale. Private wells are generally regulated at the local level by boards of health or health departments.

Nantucket has its own requirements.

According to the Town of Nantucket, Chapter 386 of the Private Drinking Water Well Regulations requires water-quality testing for specified substances before the sale, conveyance, or transfer of a property served by a private drinking-water well. The specific testing requirement appears in Chapter 386, Section (VIII)(4) (“Water Quality Testing Requirements”), and the property-transfer trigger is set out in Section (VIII)(9). The Nantucket Board of Health adopted these updated regulations on September 21, 2023, and they became effective January 1, 2024, including PFAS testing.

The Town also states that water-quality test results must be submitted to the Board of Health.

For sellers, buyers, real-estate professionals, attorneys, property managers, and caretakers involved in a Nantucket transaction, the important point is simple: do not assume that a basic bacteria test—or an older well-water report—is enough to satisfy the current property-transfer requirements.

Confirm the testing needed for the transaction under the current Nantucket regulations and arrange for the appropriate laboratory analysis.

What Does Nantucket’s Real Estate Well Testing Include?

The Town of Nantucket currently provides several types of well-water sampling kits through its Health & Human Services office. Two categories are especially important to understand during a real-estate transaction.

Current Town Well Kit Prices

As of this writing, the Town of Nantucket’s own kit prices are (each kit also carries a separate $10 town administrative fee, payable to the Town; the lab fee itself is payable to Barnstable County Laboratory):

Routine Well Kit: $70 (+ $10 town fee)
Real Estate Well Kit: $190 (+ $10 town fee)
PFAS Well Kit: $265 (+ $10 town fee)
Lead Kit: $20 (+ $10 town fee)

Prices, kit contents, and fees are set by the Town and can change — confirm current pricing directly with Nantucket Health & Human Services before budgeting for a transaction.

Routine Well Kit

According to the Town’s current Well Testing & Sampling page, the Routine Well Kit analyzes:

Total coliform
Sodium
Iron
Copper
Manganese
pH
Conductance
Nitrate

These parameters can provide useful information about microbiological water quality, minerals, chemistry, and other characteristics of a private water supply.

Real Estate Well Kit

The Town’s Real Estate Well Kit includes the same analyses as the Routine Well Kit, plus testing for volatile organic compounds (VOCs).

VOCs are a broad group of carbon-containing chemicals that can enter groundwater from certain fuels, solvents, industrial products, and other sources. Because many VOCs cannot be identified simply by looking at, smelling, or tasting water, laboratory analysis is necessary to determine whether the compounds included in a particular test are present.

PFAS Testing

PFAS testing is also part of Nantucket’s property-transfer requirements for private drinking-water wells.

PFAS—per- and polyfluoroalkyl substances—are a large group of synthetic chemicals that have been used in numerous industrial and consumer applications. Their persistence in the environment is one reason PFAS have become an important drinking-water issue.

PFAS sampling also requires careful collection procedures to reduce the possibility of contaminating the sample. MassDEP recommends following the laboratory’s PFAS sampling instructions closely and using an appropriately certified laboratory.

Lead Testing

The Town also offers a standalone Lead Kit. Lead in well water most often comes from household plumbing, fixtures, or solder rather than the well itself, so a lead result can point to a different follow-up step than a PFAS or bacteria result. Lead testing is not always bundled with the Real Estate or PFAS kits, so confirm which analyses your specific transaction requires.

Why Sellers Should Schedule Nantucket Well Water Testing Early

A common mistake in a real-estate transaction is treating the well-water test as something that can be handled immediately before closing.

Laboratory testing takes time, and not every analysis has the same turnaround time.

The Town of Nantucket currently states that its Routine and Real Estate Well Kits can take up to 14 business days for results. PFAS testing can take up to six weeks.

Those timelines can matter when a purchase-and-sale agreement, inspection period, financing deadline, or closing date is approaching.

Scheduling early also provides time to respond appropriately if a result requires additional attention. Depending on the finding, the next step could involve confirming the result, discussing it with the appropriate local authority or laboratory, performing additional testing, or evaluating contaminant-specific treatment.

Professional sampling can also simplify the logistics. Nantucket Well Water Sampling LLC visits the property, collects the requested water samples, coordinates analysis with a certified or accredited laboratory, and delivers the laboratory report digitally to the client and, when requested, their broker.

What Happens if a Well-Water Test Finds a Problem?

An unsatisfactory laboratory result does not tell you, by itself, that every part of the home’s water system needs filtration.

The appropriate response depends on what was detected, at what concentration, and the characteristics of the property and water supply.

For example, a bacterial result requires a different response from elevated nitrate, a VOC detection, a mineral-related issue, or PFAS.

The laboratory report should therefore come before decisions about treatment.

Depending on the result, appropriate next steps may include:

Reviewing the report and applicable drinking-water guideline or standard.
Confirming whether repeat or follow-up sampling is appropriate.
Investigating possible sources or well-system conditions.
Consulting the Nantucket Health Department or another qualified professional when appropriate.
Evaluating a treatment method designed for the specific contaminant.
Retesting after corrective action or treatment to determine whether it is performing as intended.

Avoid choosing a generic “whole-house filter” simply because a test produced an unexpected result. No single residential treatment method should be assumed to address every potential well-water contaminant.

What if PFAS Is Detected?

PFAS results deserve contaminant-specific evaluation rather than a one-size-fits-all response.

EPA identifies several technologies that can reduce certain PFAS in drinking water, including granular activated carbon, ion exchange resins, and reverse osmosis. The appropriate approach can depend on the PFAS detected, concentration, other characteristics of the water, household demand, treatment-system design, and maintenance.

There is also an important distinction between point-of-use and point-of-entry treatment.

A point-of-use system treats water at a particular location, such as the kitchen sink. A point-of-entry system treats water as it enters the home.

Treatment equipment also requires maintenance. Filters or treatment media may need replacement, and performance can decline over time. Where PFAS treatment is being considered, EPA recommends looking for appropriate independent certification and following manufacturer requirements.

Post-installation water testing can help verify whether a treatment system is reducing the target contaminant as intended.

Nantucket Well Water Sampling LLC provides sampling and laboratory coordination, not filtration design or installation. Property owners who need treatment should work with an appropriately qualified water-treatment professional after identifying the contaminant through testing.

Can Sellers Use an Old Well-Water Test?

An older laboratory report can provide useful historical information about a property, but sellers should not assume it satisfies Nantucket’s current property-transfer requirements.

The Town’s rules require testing in connection with the sale, conveyance, or transfer of a property served by a private drinking-water well. Current requirements also include PFAS.

This is particularly important when reviewing records from before January 1, 2024, when Nantucket’s updated private-well regulations became effective.

If you’re unsure whether an existing report satisfies the requirements for an upcoming transaction, verify the current requirements with the Nantucket Health Department before relying on it.

Who Should Arrange the Well-Water Test?

The property owner is responsible for ensuring that the required testing is completed, but the practical arrangements may involve several people.

A seller may coordinate testing directly, while in other transactions a real-estate agent, attorney, caretaker, or property manager helps keep the process moving.

For seasonal homeowners, professional sampling can be particularly useful when the owner is off-island or when access needs to be coordinated through a broker, caretaker, or property manager.

Whatever arrangement is used, everyone should be clear about:

Which analyses are required
Who will collect the samples
Which laboratory will perform the analysis
Expected laboratory turnaround times
Who receives the laboratory report
Who is responsible for submitting required results to the Board of Health

Questions about the submission process or current requirements can be directed to the Nantucket Board of Health at PFAS@nantucket-ma.gov or 508-228-7200, ext. 7321.

Don’t Confuse Private-Well Rules With Public-Water Requirements

Not every Nantucket property gets its drinking water from a private well.

If the property is connected to a public water system, the private-well property-transfer requirements discussed here may not apply in the same way.

This article is specifically about private drinking-water wells. Determining the property’s water source should therefore be one of the first steps when preparing for a sale. See our guide on how to tell whether a property is on a private well or Town water if you’re not sure.

It’s also worth noting that this property-transfer requirement is separate from Nantucket’s ongoing biennial well-testing rule, which applies to many private-well owners every two years regardless of whether they’re selling. A test done for a sale doesn’t automatically substitute for that separate cycle—see the guide linked above for how the two requirements interact.

A Practical Well-Testing Timeline for a Nantucket Home Sale

If you know a private-well property is going on the market, start the water-testing conversation early.

First, confirm that the home is served by a private drinking-water well and identify the current Nantucket testing requirements. Then determine which laboratory analyses are needed and schedule sample collection with enough time for laboratory processing.

Build additional time into the transaction for PFAS results. The Town currently notes that PFAS analysis can take up to six weeks.

Once results are available, review the laboratory report and make sure the required information is submitted appropriately. If a result requires further attention, allowing extra time gives the parties an opportunity to consider follow-up sampling or contaminant-specific treatment evaluation without unnecessarily compressing the closing schedule.

Frequently Asked Questions

Is well-water testing required to sell a house on Nantucket?
For a Nantucket property served by a private drinking-water well, yes. Under Nantucket’s Private Drinking Water Well Regulations, the owner must complete specified water-quality testing before selling, conveying, or transferring the property.

Is PFAS testing required for a Nantucket private-well home sale?
Yes. Nantucket’s updated regulations, effective January 1, 2024, include PFAS in the testing required before the sale or transfer of a property served by a private drinking-water well.

What is included in Nantucket’s Real Estate Well Kit?
According to the Town’s current testing page, the Real Estate Well Kit includes total coliform, sodium, iron, copper, manganese, pH, conductance, nitrate, and VOC analysis. PFAS sampling is handled through a separate PFAS kit in the Town’s current program.

How long does Nantucket well-water testing take?
The Town currently advises that Routine and Real Estate Well Kit results may take up to 14 business days. PFAS results can take up to six weeks. Actual turnaround can vary, so confirm timing when arranging your testing.

Do the results have to be submitted to the Nantucket Board of Health?
Yes. Nantucket’s current private-well information states that water-quality test results must be submitted to the Board of Health. Questions about submission can be directed to PFAS@nantucket-ma.gov or 508-228-7200, ext. 7321.

How much does Nantucket well water testing cost?
Through the Town’s own program, current kit prices are approximately $70 for the Routine Well Kit, $190 for the Real Estate Well Kit, $265 for the PFAS Well Kit, and $20 for the Lead Kit, each plus a separate $10 town administrative fee. Prices are set by the Town and can change, so confirm current pricing before budgeting for a transaction.

Does a failed water test mean I need a whole-house filtration system?
Not necessarily. Treatment should be based on the specific contaminant, concentration, water chemistry, household needs, and other property-specific factors. Additional sampling or other corrective action may also be appropriate. Test first, then evaluate the result before selecting treatment. See our related guide: Best Water Filters for Private Wells on Nantucket.

Can Nantucket Well Water Sampling LLC install a filtration system?
No. Nantucket Well Water Sampling LLC provides professional sample collection and coordinates laboratory analysis. It does not design or install water-treatment systems. If treatment is needed, laboratory results can help an appropriately qualified treatment professional determine which options should be evaluated.

Preparing to Sell a Nantucket Property With a Private Well?

For private-well properties, water testing is now an important part of preparing for a Nantucket real-estate transfer. Starting early can provide enough time for sample collection, laboratory analysis, PFAS results, and any appropriate follow-up before closing.

Schedule a professional well-water sampling appointment with Nantucket Well Water Sampling LLC to arrange sampling for a Nantucket property. The company visits the property, collects the samples, coordinates analysis with a certified or accredited laboratory, and provides the completed laboratory report digitally.

For a pending transaction, schedule testing as early as practical rather than waiting for the closing date.

Book an Appointment · Learn more about our services, how sampling works, or get in touch with questions.

Sources

This article is educational and is not legal, medical, or property-specific advice. Regulations, fees, kit contents, and turnaround times can change — verify current requirements with the Nantucket Health Department before relying on this information for a transaction.

Selling a Nantucket Home With a Private Well? What Water Testing Is Required Before Closing