Westford, Groton, Dunstable, and Pepperell include both public-water customers and private-well properties — the share on wells varies widely by neighborhood, so verify your source. Carlisle homes generally rely on private wells, but homeowners should verify their source. For well water treatment in Groton or elsewhere across our 23 towns in Middlesex & Essex County, iron, manganese, hardness, sulfur-like odor, and pH are property-specific testing prompts.
As of August 2026, Massachusetts regulates six PFAS compounds (PFAS6) in public supplies; private wells are not covered by those public-system rules — that is why owner-arranged testing matters. See the MassDEP PFAS guidance. Public-water customers should begin with the current CCR, while private-well owners need a properly collected sample. Water testing and treatment are in scope; drain-cleaning, sewer-main, septic, sump-pump, and well-pump work are not.
About this water informationUtility reports summarize testing across a public water system; they are not a test of the water at your specific faucet. EWG health guidelines may be lower than enforceable federal or state limits. Homes on private wells are not represented by municipal utility data. Treatment recommendations should be based on the current utility report, household plumbing conditions, and a properly collected water sample.
Reviewed by: Jeneral Plumbing — August 2026. Official water information: Westford 2025 CCR · Groton Water Department 2025 CCR · West Groton reports · Dunstable 2025 CCR · Pepperell CCRs · Carlisle well resources (no municipal CCR).