State drinking water records
Massachusetts drinking water systems
527 community water systems serve Massachusetts and are listed below under 14 counties and on the pages of 241 cities and towns. Their own population figures add up to 10,050,818 people, a sum that counts people twice where one system sells water to another.
106 of them (20%) had at least one health-based violation in the last 10 years. 32 systems still have one unresolved.
346 rely mainly on groundwater and 181 on surface water, counting water bought from other systems.
522 systems filed a lead service line inventory listing 28,562 lead lines, 13,175 galvanized lines that must be replaced and 349,967 lines of unknown material.
34 systems have no service area map from EPA and are placed by mailing address.
- Community water systems
- 527
- People served, sum of each system's own figure
- 10,050,818
- Systems with a health-based violation, last 10 years
- 106
- Systems with one unresolved
- 32
- Lead service lines in inventories
- 28,562
Counties
14 countiesEach county counts the systems whose service area map reaches it. Systems placed only by a mailing address are listed on the county pages but not counted here.
| County | Systems | People served | With a health-based violation, 10 years | With one unresolved |
|---|---|---|---|---|
| Barnstable County | 28 | 551,446 | 4 | 1 |
| Berkshire County | 39 | 114,636 | 7 | 0 |
| Bristol County | 27 | 625,807 | 6 | 1 |
| Dukes County | 4 | 38,534 | 0 | 1 |
| Essex County | 36 | 813,499 | 6 | 3 |
| Franklin County | 26 | 50,104 | 4 | 4 |
| Hampden County | 28 | 426,610 | 7 | 2 |
| Hampshire County | 29 | 140,097 | 4 | 0 |
| Middlesex County | 90 | 1,605,062 | 23 | 8 |
| Nantucket County | 2 | 30,703 | 0 | 2 |
| Norfolk County | 37 | 721,575 | 8 | 1 |
| Plymouth County | 41 | 517,248 | 13 | 4 |
| Suffolk County | 4 | 795,468 | 1 | 0 |
| Worcester County | 106 | 730,046 | 20 | 4 |
Largest systems
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| MWRA | Suffolk County | 2,660,000 | Surface water | 0 | 0 | 0 |
| Boston Water and Sewer Commission (MWRA) | Suffolk County | 675,647 | Purchased surface water | 1 | 0 | 2,184 |
| Worcester DPWP, Water Supply Division | Worcester County | 206,518 | Surface water | 0 | 0 | 0 |
| Springfield Water and Sewer Commission | Hampden County | 167,954 | Surface water | 9 | 0 | 0 |
| Cambridge Water Department | Middlesex County | 118,214 | Surface water | 0 | 0 | 2,058 |
| Lowell Regional Water Utility | Middlesex County | 115,000 | Surface water | 1 | 0 | 274 |
| Quincy Water Dept. (MWRA) | Norfolk County | 106,000 | Purchased surface water | 0 | 0 | 451 |
| Brockton Water Department | Plymouth County | 105,643 | Surface water | 1 | 0 | 0 |
| Inima USA / Aquaria LLC | Bristol County | 105,643 | Surface water | 0 | 0 | 0 |
| Lynn Water and Sewer Comm | Essex County | 101,253 | Surface water | 0 | 0 | 224 |
| City of New Bedford Dpi | Bristol County | 101,079 | Surface water | 0 | 0 | 5,676 |
| Falmouth Water Dept | Barnstable County | 97,551 | Surface water | 2 | 0 | 5 |
| Fall River Water Department | Bristol County | 94,000 | Surface water | 0 | 1 | 906 |
| Salem and Beverly Water Supply Board | Essex County | 90,330 | Surface water | 0 | 0 | 0 |
| Lawrence Water Works | Essex County | 88,877 | Surface water | 1 | 0 | 65 |
Systems with unresolved health-based violations
32 systems| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Andrews Farm Water Co.,Inc. | Essex County | 150 | Groundwater | 4 | 3 | No inventory |
| Otis Air National Guard Base | Barnstable County | 6,000 | Groundwater | 2 | 2 | No inventory |
| North Carver Water District | Plymouth County | 300 | Groundwater | 1 | 2 | No inventory |
| Aquinnah Wampanoag | Dukes County | 89 | Groundwater | 0 | 2 | 0 |
| Toria Heights Condominium | Worcester County | 60 | Groundwater | 2 | 2 | 0 |
| Monroe Water District | Franklin County | 55 | Surface water | 20 | 2 | 0 |
| Breton Estates | Hampden County | 48 | Groundwater | 0 | 2 | 0 |
| Herring Cove Condominiums Trust | Plymouth County | 25 | Groundwater | 0 | 2 | 0 |
| Fall River Water Department | Bristol County | 94,000 | Surface water | 0 | 1 | 906 |
| Malden Water Division (MWRA) | Middlesex County | 66,263 | Purchased surface water | 1 | 1 | 2,460 |
| Everett Water Dept. (MWRA) | Middlesex County | 49,075 | Purchased surface water | 0 | 1 | 1,071 |
| Braintree Water and Sewer Dept. | Norfolk County | 39,143 | Surface water | 0 | 1 | 3,448 |
| Natick Water and Sewer Division | Middlesex County | 37,006 | Groundwater | 0 | 1 | 0 |
| Wannacomet Water Company | Nantucket County | 27,703 | Groundwater | 0 | 1 | 168 |
| Wilmington Water Dept | Middlesex County | 22,481 | Purchased surface water | 1 | 1 | 0 |
| Concord Water Dept | Middlesex County | 18,788 | Surface water | 2 | 1 | 94 |
| Sudbury Water District | Middlesex County | 18,416 | Groundwater | 1 | 1 | 0 |
| Whitman Water System | Plymouth County | 14,837 | Purchased surface water | 0 | 1 | 0 |
| Tisbury Water Works | Dukes County | 6,082 | Groundwater | 0 | 1 | 31 |
| Shirley Water District | Middlesex County | 4,121 | Groundwater | 0 | 1 | 0 |
| Nahant Water Dept. (MWRA) | Essex County | 3,334 | Purchased surface water | 0 | 1 | 7 |
| Siasconset Water Department | Nantucket County | 3,000 | Groundwater | 0 | 1 | 0 |
| Whately Water Department | Franklin County | 900 | Groundwater | 0 | 1 | 0 |
| Sturbridge Retirement Coop. Corp. | Worcester County | 350 | Groundwater | 0 | 1 | 0 |
| Eagle Hill School | Worcester County | 300 | Groundwater | 1 | 1 | 0 |
| Four Mile Village | Essex County | 133 | Groundwater | 0 | 1 | 0 |
| Griswoldville Water District | Franklin County | 125 | Groundwater | 0 | 1 | 0 |
| Pan Am Southern Railroad | Franklin County | 120 | Purchased surface water | 0 | 1 | 0 |
| Granville Centre Water Co | Hampden County | 70 | Groundwater | 0 | 1 | 0 |
| Lake Point Village | Plymouth County | 66 | Groundwater | 0 | 1 | 0 |
| Bolton Country Manor | Worcester County | 60 | Groundwater | 1 | 1 | 0 |
| Benchmark Condominiums | Middlesex County | 60 | Groundwater | 0 | 1 | 0 |
Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations