Certified well water labs in Massachusetts (2026)

WellTestList · Thursday, October 8, 2026 · state page

More than 500,000 people in Massachusetts rely on private wells for drinking water, according to MassDEP’s Private Well Guidelines (updated May 2024) and the state’s Environmental Public Health Tracking program. MassDEP does not regulate private wells — your local Board of Health does under MGL Chapter 111. The state’s advice is still clear: use a MassDEP-certified lab, test bacteria and nitrate every year, and run a broader panel (arsenic, radon, VOCs, PFAS6, and a gross-alpha screen on bedrock wells) at least once. On Cape Cod, Barnstable County’s Water Quality Laboratory publishes a $70 routine well test and a $190 real-estate package.

The short version

1. Existing well? Bacteria and nitrate every year; a broader panel at least once. MassDEP’s Protect Your Family guide says annual coliform and nitrate/nitrite, then initially and at least every ten years: arsenic, chloride, copper, fluoride, hardness, iron, lead, manganese, pH, sodium, radon, VOCs, PFAS6, and (for bedrock wells) a gross-alpha screen. Your town’s Board of Health may require a tighter schedule.
2. Buying, selling, or drilling a new well? Check the local Board of Health first. There is no statewide sale or new-well water-test mandate. Most towns that regulate private wells require testing through a MassDEP-certified lab before a new well is approved for drinking, and many require a panel at property transfer. Lenders often ask for their own panel too.
3. Pick a certified lab that does not also sell you a softener. MassDEP’s own guidance warns that some labs sell treatment or are tied to companies that do. Ask up front. Use the searchable certified-lab database (and the private-well Excel list on Mass.gov) to confirm certification for the analytes you need.

How Massachusetts’s system actually works

Private household wells aren’t regulated by EPA, and in Massachusetts they aren’t regulated by MassDEP either. Under MGL Chapter 111, sections 122 and 31, local Boards of Health write the private-well rules: siting, construction, water quality, and quantity. MassDEP’s role is guidance — Private Well Guidelines, a model Board of Health regulation, a certified-lab program (310 CMR 42.00), and well-driller registration (310 CMR 46.00). Building permits still need a potable supply under MGL Chapter 40, section 54, which is why towns lean on certified-lab results before signing off on a new house on a well.

• Who must use a MassDEP-certified lab: whatever your Board of Health’s bylaws say. MassDEP strongly recommends certified labs for every private-well test. If the town requires certified results, a non-certified report can be rejected.
• Who pays: the well owner. Fees vary by lab; MassDEP says get a few quotes.
• Home sales: MassDEP recommends testing before you buy a house with a private well. The actual required panel is local (and often lender-driven), not a statewide closing rule.
• After well or pump work: MassDEP recommends a bacteria test after disinfection and a thorough flush.

The full recommended analyte list and frequencies are in MassDEP’s Protect Your Family guide and Appendix tables in the Private Well Guidelines. Questions: MassDEP Drinking Water Program, program.director-dwp@mass.gov. Lab certification desk: 978-682-5237.

Options we verified

What we could confirm with a public URL tonight: MassDEP’s certified-lab tools, Barnstable County’s residential price sheet, Nashoba Analytical’s price list and no-treatment statement, Northeast Environmental Laboratory’s published packages, and the mail-in product pages:

The table scrolls sideways on a phone.

What Massachusetts water tends to have

• Arsenic and uranium in bedrock wells — Naturally occurring in parts of central and northeastern Massachusetts, especially near the Clinton–Newbury fault zone and in some granitic bedrock. A USGS / MassDEP study of 478 eastern MA bedrock wells found about 13% above the 10 ppb arsenic standard and under 3% above the 30 ppb uranium standard. MassDEP recommends testing arsenic and radionuclides (including uranium) on private wells; start with the arsenic & uranium FAQs and the probability maps / well-locator tool.
• Radon in water — Common in bedrock wells. MassDEP recommends an initial radon test and a retest at least every ten years. Private Well Guidelines note that granular activated carbon is not recommended for radon above 5,000 pCi/L because of radiation buildup in the canister — aeration first if levels are that high. Test indoor air too.
• Gross alpha — For bedrock wells, MassDEP’s Protect Your Family guide uses a gross-alpha screen as a simple check for radioactive minerals (radium, uranium) before you decide on more specific radiological tests.
• Sodium, chloride, and road salt — MassDEP lists road salting among common human sources. Cape Cod’s sandy aquifer is especially sensitive; Barnstable’s routine panel includes sodium for that reason.
• Nitrate and bacteria — From septic systems, fertilizer, and surface wash. Yearly testing is the baseline everywhere in the state.
• PFAS6 — Massachusetts’ public drinking-water standard is 20 ppt for the sum of six PFAS (PFOS, PFOA, PFHxS, PFNA, PFHpA, PFDA). MassDEP recommends every private well be tested for PFAS, especially within one to two miles of a known source. Use Method 533 or 537.1 at a MassDEP-certified PFAS lab. A limited free private-well PFAS survey ran in high-private-well towns; check MassDEP’s Story Map for results, not as a standing free program. See our PFAS Method 533 / 537.1 guide.

Mail-in kits (for a broader PDF)

These are independent labs that mail bottles, test, and email a PDF, and they don’t pitch you a softener while they’re at it. In Massachusetts they make the most sense when you want a wide analyte list in one report and no Board of Health or lender paperwork is involved. For those, use a MassDEP-certified lab and follow its collection rules. Listed prices we checked for this ship (same national SKUs as other state pages):

• Tap Score / SimpleLab Essential Well: $209 listed (54 analytes; standard shipping and prepaid return on the product page).
• National Testing Laboratories WaterCheck Basic: $220 listed plus free delivery on watercheck.com. Next-day return shipping is not included. Budget for overnight return on the bacteria bottle.

Those are listed prices, not coupons. If your Board of Health or lender requires a MassDEP-certified lab report, check the kit lab’s certification status in the MassDEP database before you rely on it for that paperwork.

Side by side for a Massachusetts well

The table scrolls sideways on a phone.

Real estate, lenders, and local Boards of Health

Massachusetts does not have a statewide law that forces a water test at closing. What you must run depends on the town’s private-well regulation and on the lender. MassDEP’s Protect Your Family guide still tells buyers to test before purchase, and recommends the same yearly bacteria / nitrate schedule plus the once-per-decade broader panel afterward. Many Boards of Health require a MassDEP-certified lab for new-well approval, and some require a panel (often including VOCs, like Barnstable’s $190 real-estate package) when a property changes hands. Ask the town health agent for the written list before you order bottles.

State Sanitary Code Chapter II (105 CMR 410.180) also says a rental dwelling’s drinking water has to come from a public supply or a private source the Board of Health has approved — another reason landlords and buyers lean on certified results. More: home purchase / lender chain of custody.

Related: Connecticut · Vermont · New Hampshire · Maine · New York · PFAS 533 / 537.1 · how to read a report · after a flood · lender / CoC · cost table · Home Depot free kit vs a certified lab · How it works · back to the directory.