If you are selling a house on a private well in Boxborough this fall, when does your sale actually start? Under the rules in effect since June 1, 2026, it starts with a water sample. That sample has to be collected, analyzed and filed with the Board of Health at least 30 days before ownership changes hands.
Older guides to buying a well-and-septic home describe water testing as something the buyer orders during the inspection period. In Boxborough that step has moved earlier and onto the seller. If you add up the town's own published turnaround times, a seller who waits for a signed offer may find the calendar is already short.
What the Board of Health now requires at sale
The Boxborough Board of Health revised its Private Well Regulation on January 14, 2026. The town's well testing procedure, dated April 8, 2026, applies the rule to "existing wells prior to the sale of properties they serve." The revised regulation is posted on the town site. Under the procedure, every drinking water well on a property being sold has to meet these requirements:
- The sample is collected by the Board of Health, its agents or an Approved Sampler.
- A laboratory certified by MassDEP for drinking water does the analysis.
- Primary parameters include total coliform, arsenic, lead, nitrate, nitrite, gross alpha, PFAS by EPA Method 537.1 and radon. A longer list of secondary parameters includes sodium, chloride, iron, manganese and hardness.
- Results go to the Board of Health no less than 30 days before transfer. They remain valid for 24 months from the sample date.
- Exceeding a primary standard requires whole-house, point-of-entry treatment, a retest and a notice recorded at the Registry of Deeds.
The Board issues a compliance statement after a clean result. If treatment was needed, it issues one only after the treatment, the retest and the recorded deed notice are complete. When the change was announced in February, Boxborough News reported that results "will become a public record."
That February article gave May 1, 2026 as the start date. The town's later procedure document says properties transferred after June 1, 2026 must comply, and that is the date to use.
Counting backward from the closing date
The procedure includes a planning section with expected turnaround times. Put those times in order, add the 30-day filing deadline, and you get the earliest date a seller would need to collect the sample.
| Scenario | Lab and follow-up time, per the town procedure | Plus the 30-day filing deadline | Approximate time before closing to start |
|---|---|---|---|
| Clean result | About 3 weeks for initial results | 30 days | About 7 weeks |
| Gross alpha at or above 15 pCi/L | About 3 more weeks for radium and uranium testing | 30 days | About 10 weeks |
| Radium exceedance requiring treatment | Treatment installation, then another 3 to 4 weeks to retest | 30 days | About 13 to 14 weeks, plus installation time |
These totals are the best case, because each one assumes the sample is collected on the first day you plan for it. Even a clean result needs about seven weeks before closing. That is longer than many sellers expect to spend between accepting an offer and handing over keys. The other two scenarios run past two months, before counting the time to get a treatment system installed.
So in Boxborough, the useful time to test is before the house goes on the market. A result filed with the Board stays valid for 24 months. A test done in the spring prep period can therefore cover a sale that closes in summer or fall, and a seller who already has a clean result can offer it to buyers as a finished document.
Where the clock stretches
The scenarios in the table come from specific rules in the procedure, and each rule affects timing differently.
Gross alpha. If gross alpha comes back at or above 15 pCi/L, the well needs additional testing for radium 226 and 228 and for uranium. The procedure says this authorization "will add 3 weeks." Because these minerals occur naturally in bedrock, the result depends on where the well was drilled more than on how it was kept up. Health Agent Jim Garreffi told Boxborough News that "naturally occurring materials in the bedrock" such as arsenic and uranium "affect the potability of the water."
PFAS. A PFAS6 result above 20 parts per trillion means "treatment will be necessary." Garreffi also told Boxborough News that MassDEP's 2020–21 PFAS testing of residents' wells found PFAS "present in a number of wells" in town.
Coliform. This is the one result that treatment cannot fix. The standard is zero total coliform per 100 milliliters, and "treatment for exceedances of coliform bacteria is not allowed." After a positive sample, the well needs two consecutive negative results. Every retest takes more time.
Radon. Treatment is required above 10,000 pCi/L. Charcoal-type filters that would become radioactive waste are not permitted for radon removal, which limits the equipment options.
Any treated well also gets a recorded deed notice that describes the equipment and the need to keep it operating. The procedure describes it as a notice on the property record at the Registry of Deeds.
Why the Board made the change
Under the town's earlier well regulations, last amended in March 2004, sellers did not have to test before a transfer. At the Board's February 11 meeting, Boxborough News reported that one resident asked why the town had not voted on the change and why Boxborough was requiring a test the state does not. Garreffi answered that the Board is "allowed to make reasonable regulations" under state law.
Board member Bryan Lynch said the rule creates a testing requirement and no new water quality standards, since the standards come from the state. In the same Boxborough News account, he said families moving into town with children:
"should be told that they can drink the water."
According to the same report, the regulation's wording is based on a MassDEP model regulation for private wells.
Western Boxborough's condos are on a separate water track
The private well rule applies to wells serving individual properties. West of I-495, on Swanson Road, Codman Hill Road and Beaver Brook Road, many homes get water from shared public water systems instead. Those systems have been dealing with their own PFAS problem. According to the 2023 Town Meeting warrant, PFAS above the state standard was found in 10 of the 11 public water systems in that area. The Finance Committee estimated that about 1,100 residents were affected.
The fix is a pipeline bringing treated water from Littleton. In August 2026, Boxborough News reported that Water Resources Committee Chair Les Fox said the main from the Whitcomb Avenue Water Treatment Plant to Boxborough was finished, the hydrants were operating, and connection procedures for the housing units were being set up. The project is expected to be complete by the end of 2026. Town Administrator Michael Johns reported that the condominium associations being served had received state grants covering all of their owners' betterment fees, with leftover money going toward connection costs.
As a result, water questions differ by property type. For a condo buyer on that side of town, the questions are about the association's connection to the Littleton line and its timing. For a single-family seller with a private well, the issue is the Board of Health filing.
Why the extra weeks matter this fall
The Massachusetts Association of Realtors' September 2026 report for Boxborough shows a slower single-family market. Cumulative days on market rose to 49 in September 2026, up from 35 in September 2025. Sellers received 94.1% of original list price that month, down from 96.4%. There were seven single-family homes for sale. The same report warns that one month of data "can sometimes look extreme due to small sample size." Only three single-family homes closed in September.
When homes are taking longer to sell, a seller who has not started the water test is effectively adding weeks to the timeline. A seller who files a clean result before listing has already handled that step.
In February, Water Resources Committee minutes recorded that the health agent was "the only approved sampler, at this time" and would collect samples free of charge. That same month, Boxborough News reported that Nashoba Analytical of Ayer was performing the testing at no cost, while the Nashoba Board of Health charged a fee for the compliance certificate. The April procedure takes a different line. It says "all costs and laboratory arrangements" belong to the property owner and that sampling fees must be paid to Nashoba Associated Boards of Health before the sample is collected. Before scheduling a sample, it is worth asking about current sampler availability and fees.
Questions to settle before listing, or before writing an offer:
- Is there a well test result on file with the Board of Health, and is it dated within the last 24 months?
- Does the property already have point-of-entry treatment? If it does, the treated water must also be sampled for the parameters the system treats.
- Does the purchase and sale agreement allow enough time for the 30-day filing deadline, and does it say whether buyer or seller pays for testing? Boxborough News reported the cost as negotiable between them.
- For condos west of I-495, where does the association's connection to the Littleton waterline stand?
Quick answers
Does a clean test from last year count? The procedure says results are valid for 24 months from the sample date, so a recent clean result may still count.
Which wells does the requirement cover? The procedure applies it to all drinking water wells on a property being sold. Questions about exceptions belong with the Board of Health.
What happens if water cannot be brought up to standard? The Board of Health "may take actions," including requiring the owner to provide an alternative source of drinking water.
This post explains a town regulation as general information. It is not legal, environmental or financial advice. Please confirm the requirements for your property with the Boxborough Board of Health, a real estate attorney or a qualified water professional.
Ann Shaw Homes can help you plan the test, the timeline and your home preparation together, so the filing deadline is covered well before an offer comes in. Request a personal market consultation to get started.
