State Hub
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
301–325 of 328North Dighton Fire District
MA4076002 · 1,300 served
Russell Water Dept
MA1256000 · 1,228 served
Gilbertville Water District
MA1124001 · 1,089 served
Brookfield Water Department
MA2045000 · 1,008 served
Egremont Water Dept
MA1090000 · 1,000 served
Jiminy Peak Resort
MA1121004 · 1,000 served
Aquarion Water Company
MA1267000 · 987 served
Wrentham Developmental Center
MA4350001 · 937 served
West Warren Water District
MA1311001 · 927 served
Whately Water Department
MA1337010 · 900 served
Pequot Highlands
MA3258001 · 900 served
Menemsha Water Company
MA4062000 · 841 served
Northfield Water District
MA1217000 · 800 served
Bolton Office Park Alta Nashoba Valley
MA2034019 · 788 served
Chester Water Dept
MA1059000 · 750 served
Northfield Mt Hermon School
MA1106002 · 750 served
Wellfleet Municipal Water System
MA4318094 · 750 served
South Meadow Village
MA4052001 · 750 served
East Northfield Water Co
MA1217001 · 659 served
Pine Valley Plantation
MA1024002 · 600 served
Barnstable County Jail
MA4036015 · 600 served
Worthington Fire District
MA1349000 · 565 served
Erving Water Dept
MA1091000 · 561 served
West Stockbridge Water Dept
MA1326000 · 535 served
Bard College at Simons Rock
MA1113017 · 500 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