Well water testing in Worcester County, Massachusetts (2026)

WellTestList · Monday, October 26, 2026 · county page · back to the Massachusetts page

Worcester County has an estimated 69,000 households on private wells by EPA’s 2020 model, from bedrock wells in the hill towns to dug wells on old farms. There is no county health department to call. In Massachusetts, the town Board of Health writes the well rules, and they vary a lot from Grafton to Harvard to Leicester. Here is how testing works in Worcester County, what some towns require when you build a well or sell a house, the certified labs nearby with their posted prices, and what central Massachusetts bedrock calls for.

The short version

1. Your town Board of Health is in charge, not the county or the state. MassDEP sets guidance and certifies labs, but each town writes its own private well regulation under state law (MGL Chapter 111). Ask your town health agent for the written list before you order bottles.
2. Some towns require a test before a house sells. Leicester requires a certified-lab test of every drinking water well no more than a year before transfer. Harvard requires one at least 30 days before transfer, and since July 1, 2025 its list includes PFAS6. Many other towns have no sale rule, so check.
3. New wells need a permit and a certified-lab test before use. Grafton, for example, wants a long list of parameters on untreated water and won’t let you move in without a Well Certificate of Compliance.
4. Test for arsenic, uranium and radon at least once. Worcester County sits on the Clinton–Newbury fault zone, the strongest predictor of high arsenic in the USGS/MassDEP bedrock well study, and granite bedrock raises the odds for uranium.
5. Test for PFAS, especially near a known source. Massachusetts’ standard is 20 ppt for PFAS6. Wells in Westminster, Princeton and Harvard have tested above it. The state’s free private-well PFAS testing ended in 2022.
6. Test bacteria and nitrate every year. MassDEP also suggests the broader panel at least every 10 years.

Who to call

• Your town Board of Health. Worcester County no longer has a county government (it was abolished in 1998), so there’s no county well program. The town health agent handles well permits, sale rules, and questions about results. Some towns share an agent through a health district. Harvard, for example, works with the Nashoba Associated Boards of Health.
• MassDEP private well guidance: the private wells FAQ and the searchable certified lab list (set the matrix to Potable and the homeowner filter to Yes).
• Westminster, near Bean Porridge Hill Road? Lessard Environmental, the site’s Licensed Site Professional contact, handles sampling, bottled water and results: westminster@lessard-environmental.com or 978-338-5541 x102 (per the Westminster Board of Health).
• Renting? Leicester, for example, requires landlords to test yearly and share every result with tenants.

Town rules we checked

These are examples from towns that post their regulations online. They show the range. Your town’s rule may be stricter, looser, or missing.

• Leicester (Board of Health Regulations for Private Wells, 1989, revised 2023). Before a sale or transfer, the owner must have every drinking water well tested at a Massachusetts certified lab, no more than one year before transfer, and send the results to the Board before the transfer. The owner must also give the buyer copies of every past result they know about. New wells must be tested for arsenic, chloride, copper, fluoride, hardness, iron, lead, manganese, pH, sodium, total coliform, E. coli, and nitrate/nitrite, plus gross alpha and radon on bedrock wells. Every drinking water well, rentals included, must be tested yearly for coliform, E. coli, nitrate, nitrite, pH, conductivity, sodium and iron.
• Harvard (Board of Health water quality page; Code Article II, Private Wells, effective July 1, 2025). A property being sold must have its untreated well water sampled by the Board, its agent, or an approved sampler and tested at a MassDEP-certified lab. The required list is coliform, E. coli, arsenic, lead, nitrate, nitrite, gross alpha, PFAS6 (EPA Method 537.1) and radon, plus about 20 secondary parameters. Results go to the Board at least 30 days before transfer and are good for 24 months. High arsenic, radon, radium or uranium, or any treatment system needed to meet a standard, must be noted on the deed. Before the 2025 change, PFAS was required only on streets where it had been found, such as Ayer Road, Old Mill Road and Still River Depot Road.
• Grafton (Board of Health Well Regulations, 2005, revised 2009). You need a permit to build, alter or abandon a well, and public water is required where it’s reasonably available. Casing must go at least 30 feet deep, and a 4-hour pump test must show at least 5 gallons per minute. A lab-provided sampler collects the new well sample with 48 hours’ notice to the Board, and a MassDEP- or EPA-certified lab tests it for the full list in the regulation’s Attachment A (bacteria, metals, nitrate, VOCs, pesticides, radionuclides including uranium and radon, plus iron, manganese and sodium). If the water needs treatment to pass, a notice goes on the deed. The Board recommends retesting every 3 years and coliform every year, more often for rentals and homes being sold.

MassDEP-certified labs near Worcester County

Use a MassDEP-certified lab for anything a Board of Health, buyer or lender will see. We searched MassDEP’s certified lab list tonight for labs certified for drinking water that say they take homeowner samples. In the Central region, it returns only two, and one of those is a cannabis lab. So the practical drop-off options for most of the county are just over the line in Ayer, or in northeastern Connecticut for the southern towns.

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Also on MassDEP’s homeowner list: Quabbin Analytical Laboratory in Belchertown, (413) 323-7134 (M-02454), handy for the western towns, and Nelson Analytical in North Swanzey, NH (M-NH1013), near Winchendon. We couldn’t load either lab’s website tonight to check prices or whether they sell treatment, so call first. We left out ProVerde Laboratories in Milford, which is on the homeowner list but runs a cannabis testing lab. Eurofins in Worcester and Auburn, Pace in Westborough, the Worcester water filtration plant lab and the MWRA labs are certified but not flagged for homeowner samples. MassDEP warns that some certified labs also sell treatment, so if a lab’s report comes with a sales call, get a second opinion.

What’s in Worcester County groundwater

• Arsenic. In the USGS/MassDEP study of 478 bedrock wells in 116 central and northeastern Massachusetts towns, about 13% of randomly chosen wells were over the 10 ppb arsenic standard. Arsenic tracked most strongly with closeness to the Clinton–Newbury fault zone, named for the Worcester County town of Clinton, which runs from near the eastern end of the Massachusetts–Connecticut line up to the Merrimack Valley (MassDEP arsenic & uranium FAQs). MassDEP’s well locator tool gives a probability for your address. It’s an estimate, and only a test tells you.
• Uranium, radium and radon. Under 3% of the study wells were over the 30 ppb uranium standard, with granite bedrock the most likely to exceed it. MassDEP says radon and radium usually show up in the same rock. Leicester and Harvard both require a gross alpha screen, with uranium and radium follow-ups if it’s high, and Harvard puts radon over 10,000 pCi/L on the deed.
• PFAS. Massachusetts’ drinking water standard is 20 ppt for the sum of six PFAS (PFAS6), set in October 2020 (MassDEP PFAS well FAQ). In Westminster, wells around 65 Bean Porridge Hill Road (MassNatural Fertilizer) toward South Ashburnham Road have tested above 20 ppt (Westminster Board of Health). In Princeton, a 2019–2020 PFAS release investigation found private wells on Mountain Road, Hubbardston Road and nearby streets over the standard, and several homes got treatment systems (MassDEP file, RTN 2-21072). Harvard requires PFAS6 in every sale test. MassDEP recommends testing every private well for PFAS, especially within one to two miles of a known source. See our PFAS Method 533 / 537.1 guide.
• Manganese and iron. Common in central Massachusetts wells and on every town’s list. Grafton’s regulation uses 0.05 mg/L for manganese and 0.3 mg/L for iron, which are taste and staining limits. Higher manganese is also a health concern for infants, so don’t skip it.
• Sodium and chloride. Road salt reaches shallow and dug wells near busy roads. Leicester requires yearly sodium testing, and Grafton’s list uses MassDEP’s 20 mg/L sodium guideline for people on low-sodium diets.
• Bacteria and nitrate. Septic systems and old cesspools are the usual sources. That’s why Title 5 inspections check wells near cesspools (below), and why MassDEP says to test both every year.

New wells and home sales

New wells. Massachusetts has no statewide well permit. Your town does it. Expect a Board of Health permit before drilling, a registered well driller, a yield test, and a certified-lab water test on untreated water before you can use the well or get an occupancy permit. Grafton’s and Leicester’s regulations above are typical. Under the state septic code, Title 5, a private well must be at least 50 feet from a septic tank and 100 feet from the leach field (310 CMR 15.211). A local upgrade approval can shrink that, but never below 50 feet (15.405).

Selling a house with a septic system. Title 5 also requires a septic inspection at sale. If a cesspool or privy sits less than 100 feet but at least 50 feet from a private well, it fails unless a certified-lab test of the well shows no fecal coliform and ammonia and nitrate nitrogen at or below 5 ppm. The lab’s chain-of-custody form has to be attached to the inspection report (310 CMR 15.303). Nashoba’s $75 Title V package is built for that test.

Buying a house. Massachusetts has no statewide test-at-sale law, but towns like Leicester and Harvard have their own, and MassDEP tells every buyer to test before purchase. Lenders often ask for a certified-lab bacteria test, sometimes nitrate too, with a chain-of-custody form. Ask the town health agent and your lender for their lists early, and get the full panel (arsenic, uranium, radon, PFAS6) even if nobody requires it, because it’s cheaper to know before you close. More detail is on our home purchase / lender page.

Mail-in kits that email a PDF

For routine testing that no town or lender will see, independent mail-in labs ship to central Massachusetts. Listed prices checked October 26, 2026:

• Tap Score / SimpleLab Essential Well: $209. It covers coliform and E. coli, nitrate and nitrite, and 25 metals including arsenic, uranium, manganese and lead, plus sodium and chloride. It doesn’t test VOCs, radon or PFAS.
• Tap Score / SimpleLab Advanced Well: $399. It adds VOCs and common petroleum compounds and includes overnight shipping to the lab.
• National Testing Laboratories WaterCheck Basic: $220. It covers bacteria, 22 metals and minerals (arsenic included), and 7 inorganic chemicals. NTL’s Ypsilanti, Michigan lab is on MassDEP’s certified list and takes homeowner samples (M-MI044). Next-day return shipping isn’t included, so budget for it on the bacteria bottle.

Nashoba’s posted prices are lower than any of these if you can get to Ayer, and they include radon and PFAS options the kits don’t. Mail-in kits make sense for the far corners of the county or when you want one report with everything. Don’t use one for a town sale test, a new-well approval or a Title 5 well test unless the town agrees and the lab is MassDEP-certified for every parameter. Harvard, for one, requires its own sampler.

Side by side for a Worcester County well

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Related: Massachusetts well testing · Suffolk County, NY · Fairfield County, CT · Rockingham County, NH · Chester County, PA · Oakland County, MI · How to read a well water report · PFAS 533 / 537.1 · Home purchase / lender · back to the directory.