privatewelldata / States / Massachusetts
Massachusetts well water testing
34 labs are listed on Massachusetts’s official certified-lab list; 7% of 472 sampled wells were above the arsenic limit across 12 counties. Updated 2026-10-18.
Official lab list for Massachusetts
MassDEP – certified labs serving private well ownersMassachusetts surveys its certified labs and lists those that accept samples from residents with private wells.www.mass.gov · checked 2026-10-17 (browser)Massachusetts Department of Environmental ProtectionThis state agency certifies the labs that may test drinking water. Use its list to pick a certified lab for your well sample.eeaonline.eea.state.ma.us · checked 2026-10-18 · link via EPA
Coverage map
Where the labs are
| Town | Labs |
|---|---|
| Mansfield | 3 |
| Norwell | 1 |
| Agawam | 1 |
| Albany | 1 |
| Aquinnah | 1 |
| Attleboro | 1 |
| Ayer | 1 |
| Barnstable | 1 |
| Belchertown | 1 |
| Charleston | 1 |
| Danvers | 1 |
| Dayville | 1 |
| Derry | 1 |
| East Longmeadow | 1 |
| Gloucester | 1 |
| Jamaica Plain | 1 |
| Melville | 1 |
| Middleboro | 1 |
| Milford | 1 |
| New Bedford | 1 |
| North Swanzey | 1 |
| Salem | 1 |
| South Bend | 1 |
| Tampa | 1 |
| Warwick | 1 |
| West Warwick | 1 |
| Westborough | 1 |
| Westwood | 1 |
| Wilmington | 1 |
| Winthrop | 1 |
| Woburn | 1 |
| Ypsilanti | 1 |
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Tests these labs are listed for
- Bacteria (coliform / E. coli): 17 of 34 labs
- Radioactivity: 8 of 34 labs
Counted from the tests each lab is certified for on the official list. A lab may offer more; ask before you send a sample.
Well water results by county
| County | Arsenic > 10 µg/L | Nitrate > 10 mg/L |
|---|---|---|
| Barnstable County | 2% of 123 | 5% of 1,705 |
| Berkshire County | 0% of 10 | 0% of 108 |
| Bristol County | 0% of 18 | 4% of 25 |
| Essex County | 0% of 13 | 3% of 70 |
| Franklin County | – | 4% of 53 |
| Hampden County | 4% of 24 | 4% of 69 |
| Hampshire County | 0% of 17 | 0% of 24 |
| Middlesex County | 3% of 29 | 6% of 156 |
| Nantucket County | – | 7% of 14 |
| Norfolk County | 3% of 33 | 0% of 73 |
| Plymouth County | 0% of 75 | 2% of 131 |
| Worcester County | 22% of 130 | 1% of 126 |
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Nitrate: 4% of 2,554 sampled wells statewide. All Massachusetts counties →
Labs on the MassDEP list
- Vallid Laboratories Inc., AgawamListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Adirondack Environmental Services, Inc., AlbanyListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Wampanoag Environmental Laboratory, AquinnahListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Attleboro Water Dept, AttleboroListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Nashoba Analytical, AyerListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Barnstable County Water Quality Laboratory, BarnstableListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Quabbin Analytical Laboratory, BelchertownListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- GEL Laboratories, LLC, CharlestonListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Northeast Environmental Laboratory, Inc., DanversListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Microbac Laboratories, Inc., DayvilleListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Granite State Analytical Services LLC, DerryListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Contest, A Pace Analytical Laboratory, East LongmeadowListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Biomarine, GloucesterListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- MA State Public Health Laboratory, Jamaica PlainListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Alpha Analytical, LLC, MansfieldListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Pace Analytical Services, LLC- Melville, NY, MelvilleListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Analytical Balance, MiddleboroListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- ProVerde Environmental, Inc., MilfordListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- New Bedford Health Department Laboratory, New BedfordListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Nelson Analytical Lab, Keene Division, North SwanzeyListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- New England Chromachem, SalemListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Eurofins Eaton Analytical, LLC, South BendListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- KNL Environmental Testing, LLC, TampaListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- RI Analytical, WarwickListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- New England Testing Laboratory, West WarwickListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Alpha Analytical, LLC, WestboroughListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Whitelodge Laboratory, WestwoodListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Enthalpy Analytical, LLC, WilmingtonListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- MWRA Central Laboratory, WinthropListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- Practical Applications, WoburnListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
- National Testing Laboratories, LTD, YpsilantiListed in MassDEP’s certified lab list. See the official list → (checked 2026-10-17)
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See all 3 Massachusetts lab listings →
How to choose a lab
- Pick a lab on the official list above that is certified for each test you need (bacteria and chemistry are often separate certifications).
- Ask for the lab’s own sample bottles and instructions; bacteria samples usually must reach the lab within 24–30 hours.
- Compare prices for a basic package (bacteria, nitrate, pH/TDS) and add arsenic or other metals where local data shows a risk.
- Be wary of free in-home tests from treatment-system sellers — see our salesperson checklist.
Questions
Where can I get my well water tested in Massachusetts?
Use a lab on Massachusetts’s official certified-lab list. We count 34 listed labs (excluding those marked as serving public water systems only), most in Mansfield, Norwell, Agawam. Confirm the lab is certified for the exact tests you need before you send a sample.
What should I test my well for in Massachusetts?
Test every year for bacteria (total coliform and E. coli), nitrate, pH and total dissolved solids (CDC). In Massachusetts, 7% of sampled wells with arsenic data were above the EPA limit, so include arsenic. Use our test helper for a list that fits your home.
Is there well water data for my county in Massachusetts?
Yes for 12 counties: we show the share of sampled wells above the EPA arsenic and nitrate limits, from the Water Quality Portal (USGS/EPA). These are monitoring wells as well as private wells, so test your own well.