Massachusetts: Certified labs by state

Massachusetts does not run a statewide regulatory program for private household wells; instead, private wells are overseen locally by each city or town Board of Health. MassDEP provides the state’s well-testing guidance, certified-laboratory search tools, and contaminant information that most Massachusetts residents use first. ([mass.gov](https://www.mass.gov/private-wells?utm_source=openai))

Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.

Official resources in Massachusetts

Private Wells | Mass.gov

MassDEP’s main hub for Massachusetts private-well owners, linking to testing guidance, contaminant pages, and treatment information. ([mass.gov](https://www.mass.gov/private-wells?utm_source=openai))

Find a Certified Laboratory for Water Testing

MassDEP’s page for finding certified drinking-water labs and the residential/private-well laboratory listing. ([mass.gov](https://www.mass.gov/how-to/find-a-certified-laboratory-for-water-testing?utm_source=openai))

Protect Your Family: A Guide to Water Quality Testing for Private Wells

MassDEP’s current homeowner guide listing recommended private-well tests and minimum testing frequencies in Massachusetts. ([mass.gov](https://www.mass.gov/info-details/protect-your-family-a-guide-to-water-quality-testing-for-private-wells?utm_source=openai))

Arsenic and uranium in private drinking water wells in Massachusetts

MassDEP’s state page explaining arsenic and uranium concerns in Massachusetts private wells. ([mass.gov](https://www.mass.gov/info-details/arsenic-and-uranium-in-private-drinking-water-wells-in-massachusetts?utm_source=openai))

Information for Private Well Owners During a Drought

MassDEP’s assistance page listing current technical-help and financing resources for some private well owners. ([mass.gov](https://www.mass.gov/info-details/information-for-private-well-owners-during-a-drought?utm_source=openai))

Key facts for Massachusetts

MassDEP says private wells are regulated locally by city or town Boards of Health, not by MassDEP. ([mass.gov](https://www.mass.gov/private-wells?utm_source=openai))
MassDEP recommends yearly testing for coliform bacteria and nitrate/nitrite. ([mass.gov](https://www.mass.gov/info-details/protect-your-family-a-guide-to-water-quality-testing-for-private-wells?utm_source=openai))
MassDEP recommends arsenic, lead, manganese, radon, VOCs, PFAS6, and gross alpha screening on at least a ten-year cycle. ([mass.gov](https://www.mass.gov/info-details/protect-your-family-a-guide-to-water-quality-testing-for-private-wells?utm_source=openai))
For bedrock wells, MassDEP recommends a gross alpha screen to determine whether radium or uranium testing may be needed. ([mass.gov](https://www.mass.gov/info-details/protect-your-family-a-guide-to-water-quality-testing-for-private-wells?utm_source=openai))
MassDEP says radon can be a well-water problem in Massachusetts, especially in bedrock wells. ([mass.gov](https://www.mass.gov/info-details/protect-your-family-a-guide-to-water-quality-testing-for-private-wells?utm_source=openai))
MassDEP’s 2026 report says Massachusetts currently lacks a statewide private drinking-water well regulatory program. ([mass.gov](https://www.mass.gov/doc/massdep-private-well-program-report-considerations-related-to-establishing-a-statewide-private-well-program-march-2026/download?utm_source=openai))

What to do next

Start by checking your local Board of Health requirements, because towns can require specific private-well testing beyond MassDEP’s baseline recommendations. ([mass.gov](https://www.mass.gov/info-details/faqs-private-wells?utm_source=openai))
Use a MassDEP-certified laboratory and confirm it is certified for each contaminant you want tested, since not all labs offer every analyte. ([mass.gov](https://www.mass.gov/info-details/private-drinking-water-testing-and-the-use-of-massdep-certified-laboratories?utm_source=openai))
If your well is in bedrock or water quality changes after repairs, heavy rain, or drought, add targeted testing sooner rather than waiting for routine intervals. ([mass.gov](https://www.mass.gov/info-details/faqs-private-wells?utm_source=openai))

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