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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
276–300 of 328Agawam Springs Water Company
MA4239060 · 2,380 served
Lanesborough Fire and Water District
MA1148000 · 2,324 served
Warren Water District
MA1311000 · 2,289 served
Elm Hill Water District
MA2017001 · 2,278 served
Aquarion Water Company Ponds of Plymouth
MA4239045 · 2,267 served
Byfield Water District
MA3205001 · 2,228 served
Mci Norfolk/cedar Junction/walpole
MA2208001 · 2,200 served
Huntington Water Dept
MA1143000 · 2,180 served
Aquarion Water Company (dover)
MA3078006 · 1,922 served
West Groton Water Supply District
MA2115001 · 1,853 served
Shelburne Falls Fire District
MA1268000 · 1,806 served
Hinsdale Water Dept
MA1132000 · 1,800 served
Southfield Redevelopement Authority
MA4336007 · 1,800 served
Freetown Water Commission
MA4102035 · 1,600 served
Williamsburg Water Dept
MA1340000 · 1,575 served
East Brookfield Water Department
MA2084000 · 1,526 served
Hillcrest Water District
MA2151002 · 1,500 served
Bernardston Fire Water Dist
MA1029000 · 1,462 served
Thorndike Fire and Water District
MA1227001 · 1,435 served
Bondsville Fire and Water District
MA1227002 · 1,429 served
Harvard Water Department
MA2125000 · 1,422 served
Cheshire Water Dept
MA1058000 · 1,407 served
Housatonic Water Works
MA1113003 · 1,391 served
Riverbridge
MA2028020 · 1,330 served
Deerfield Fire District
MA1074000 · 1,300 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
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Data source: Utility data from EPA SDWIS. 328 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-19