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Massachusetts Water Quality
328
Utilities in database
10.0M
Residents served
18%
On private wells
3
Key contaminants tracked
Drinking Water in Massachusetts
Massachusetts has 328 community water systems serving approximately 10.0 million residents. Primary water sources include surface water. The most commonly reported contaminants include lead, disinfection byproducts, nitrates. 18% of Massachusetts residents rely on private wells. DEP holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Massachusetts
176–200 of 328Hanson Water Department
MA4123000 · 9,546 served
Pepperell Dpw Water Division
MA2232000 · 9,217 served
Aquarion Water Company, Pinehills
MA4239055 · 9,195 served
Millis Water Dept
MA2187000 · 9,002 served
Plainville Water Department
MA4238000 · 8,805 served
Georgetown Water Department
MA3105000 · 8,766 served
Lynnfield Center Water District
MA3164000 · 8,569 served
Wilbraham Water Dept (mwra)
MA1339000 · 8,533 served
Ayer Dpw Water Division
MA2019000 · 8,479 served
Acushnet Water Department
MA4003000 · 8,384 served
Turners Falls Water Dept
MA1192000 · 8,080 served
Edgartown Water Department
MA4089000 · 8,027 served
Whitinsville Water Company
MA2216000 · 7,933 served
Northbridge Water Division
MA2216006 · 7,889 served
Adams Fire District
MA1004000 · 7,851 served
West Bridgewater Water Dept
MA4322000 · 7,709 served
Buzzards Bay Water District
MA4036001 · 7,700 served
Mattapoisett Water Department
MA4173000 · 7,685 served
Southwick Water Dept
MA1279000 · 7,646 served
Norfolk Water Division
MA2208000 · 7,602 served
Cohasset Water Dept
MA4065000 · 7,555 served
Halifax Water Department
MA4118000 · 7,553 served
North Chelmsford Water Dist
MA3056002 · 7,498 served
Hamilton Water Dept
MA3119000 · 7,377 served
Aquarion Water Company Oxford
MA2226000 · 7,343 served
Key Contaminant Concerns in Massachusetts
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Massachusetts Water FAQs
Quick Links
Data source: Utility data from EPA SDWIS. 328 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-19