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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
126–150 of 328Webster Water Department
MA2316000 · 17,776 served
Greenfield Water Department
MA1114000 · 17,645 served
Swansea Water District
MA4292000 · 17,375 served
Amesbury Dpw Water Div.
MA3007000 · 17,366 served
Sharon Water Dept
MA4266000 · 16,846 served
Duxbury Water Department
MA4082000 · 16,387 served
North Reading Water Dept.
MA3213000 · 16,379 served
East Longmeadow Dpw Water Dept
MA1085000 · 16,358 served
Easthampton Water Dept
MA1087000 · 16,211 served
Bellingham Dpw Water Sewer Division
MA2025000 · 16,061 served
Longmeadow Water Dept
MA1159000 · 15,853 served
Holliston Water Department
MA2136000 · 15,713 served
Clinton Water Dept
MA2064000 · 15,530 served
Middleborough Water Supply
MA4182000 · 15,350 served
Swampscott Water Dept. (mwra)
MA3291000 · 15,175 served
Hanover Water Dept
MA4122000 · 14,984 served
Whitman Water System
MA4338000 · 14,837 served
South Hadley Fd #1 (mwra)
MA1275000 · 14,800 served
Kingston Water Department
MA4145000 · 14,712 served
Seekonk Water District
MA4265000 · 14,704 served
East Bridgewater Water Dept
MA4083000 · 14,526 served
Fairhaven Water Dept
MA4094000 · 14,470 served
Bedford Water Dept.
MA3023000 · 14,394 served
Northborough Water Department (mwra)
MA2215000 · 13,535 served
Wayland Water Department
MA3315000 · 13,196 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