State drinking water records
New Hampshire drinking water systems
706 community water systems serve New Hampshire and are listed below under 10 counties and on the pages of 92 cities and towns. Their own population figures add up to 907,476 people, a sum that counts people twice where one system sells water to another.
220 of them (31%) had at least one health-based violation in the last 10 years. 46 systems still have one unresolved.
641 rely mainly on groundwater and 65 on surface water, counting water bought from other systems.
396 systems filed a lead service line inventory listing 233 lead lines, 2,085 galvanized lines that must be replaced and 121,880 lines of unknown material.
10 systems have no service area map from EPA and are placed by mailing address.
- Community water systems
- 706
- People served, sum of each system's own figure
- 907,476
- Systems with a health-based violation, last 10 years
- 220
- Systems with one unresolved
- 46
- Lead service lines in inventories
- 233
Counties
10 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 |
|---|---|---|---|---|
| Belknap County | 68 | 39,177 | 15 | 3 |
| Carroll County | 109 | 38,126 | 42 | 10 |
| Cheshire County | 32 | 46,614 | 8 | 4 |
| Coos County | 19 | 23,797 | 4 | 3 |
| Grafton County | 75 | 69,432 | 23 | 4 |
| Hillsborough County | 73 | 300,699 | 19 | 6 |
| Merrimack County | 62 | 89,457 | 21 | 5 |
| Rockingham County | 196 | 183,496 | 63 | 4 |
| Strafford County | 48 | 91,910 | 20 | 4 |
| Sullivan County | 15 | 24,526 | 4 | 1 |
Largest systems
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Manchester Water Works | Hillsborough County | 123,500 | Surface water | 0 | 0 | No inventory |
| Pennichuck Water Works | Hillsborough County | 89,073 | Surface water | 0 | 0 | No inventory |
| Concord Water Dept | Merrimack County | 44,215 | Surface water | 0 | 0 | No inventory |
| Portsmouth Water Works | Rockingham County | 33,000 | Surface water | 0 | 0 | No inventory |
| Keene Water Dept | Cheshire County | 30,000 | Surface water | 0 | 0 | No inventory |
| Dover Water Dept | Strafford County | 29,000 | Groundwater | 0 | 0 | No inventory |
| Merrimack Village Dist | Hillsborough County | 25,500 | Groundwater | 0 | 0 | No inventory |
| Rochester Water Dept | Strafford County | 25,000 | Surface water | 3 | 2 | No inventory |
| Salem Water Dept | Rockingham County | 21,000 | Surface water | 0 | 0 | No inventory |
| Aquarion Water/NH | Rockingham County | 18,950 | Groundwater | 0 | 0 | No inventory |
| Derry Water Dept | Rockingham County | 17,290 | Purchased surface water | 0 | 0 | No inventory |
| Laconia Water Works | Belknap County | 17,000 | Surface water | 0 | 0 | No inventory |
| Hudson Water Dept | Hillsborough County | 16,700 | Groundwater | 0 | 0 | No inventory |
| Unh/Durham Water Sys | Strafford County | 16,000 | Surface water | 0 | 0 | No inventory |
| Seabrook Water Dept | Rockingham County | 14,000 | Groundwater | 0 | 0 | No inventory |
Systems with unresolved health-based violations
46 systems| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| The Place in Ossipee | Carroll County | 38 | Groundwater | 0 | 58 | No inventory |
| Crosswinds | Carroll County | 73 | Groundwater | 0 | 57 | No inventory |
| Fairhaven Mobile Home Park | Hillsborough County | 63 | Groundwater | 1 | 57 | No inventory |
| Ossipee Mountains Estates | Carroll County | 255 | Groundwater | 1 | 42 | No inventory |
| Presidential Pines/Upper | Merrimack County | 60 | Groundwater | 1 | 25 | No inventory |
| Pound Road Water Works | Merrimack County | 53 | Groundwater | 0 | 25 | No inventory |
| Waterville Acres Condos | Grafton County | 50 | Groundwater | 0 | 25 | No inventory |
| Bitim Apartments | Rockingham County | 28 | Groundwater | 6 | 25 | No inventory |
| Point Breeze Condos | Carroll County | 113 | Groundwater | 0 | 21 | No inventory |
| West Point | Carroll County | 108 | Groundwater | 1 | 21 | No inventory |
| 20 Jaffrey Rd | Cheshire County | 32 | Groundwater | 2 | 21 | No inventory |
| Flintlock Apts | Merrimack County | 30 | Groundwater | 2 | 21 | No inventory |
| New Hampton Village PCT | Belknap County | 600 | Surface water | 48 | 7 | No inventory |
| Andover Village Dist | Merrimack County | 650 | Surface water | 7 | 6 | No inventory |
| Colebrook Water Works | Coos County | 1,300 | Groundwater | 0 | 4 | No inventory |
| Canaan Water Dept | Grafton County | 684 | Surface water | 1 | 4 | No inventory |
| N Walpole Village District/Low | Cheshire County | 625 | Groundwater | 0 | 4 | 1 |
| Rochester Water Dept | Strafford County | 25,000 | Surface water | 3 | 2 | No inventory |
| Meredith Water Dept | Belknap County | 3,750 | Surface water | 3 | 2 | No inventory |
| Conway Water and Sewer | Carroll County | 2,745 | Groundwater | 0 | 2 | No inventory |
| Ashland Water Dept | Grafton County | 1,525 | Groundwater | 0 | 2 | No inventory |
| Emerald Lake | Hillsborough County | 1,300 | Groundwater | 5 | 2 | No inventory |
| Bartlett Village PCT | Carroll County | 625 | Surface water | 5 | 2 | No inventory |
| Sullivan County Complex | Sullivan County | 625 | Groundwater | 0 | 2 | No inventory |
| Greenville Est Village Dist | Hillsborough County | 472 | Purchased surface water | 0 | 2 | No inventory |
| Swains Lake Village Water | Strafford County | 227 | Groundwater | 0 | 2 | No inventory |
| Monadnock Tenants | Cheshire County | 200 | Groundwater | 0 | 2 | No inventory |
| N Walpole Village Dist/High | Cheshire County | 125 | Groundwater | 0 | 2 | No inventory |
| Greenfield Hill Estates | Rockingham County | 98 | Groundwater | 1 | 2 | No inventory |
| Country Meadows | Belknap County | 90 | Groundwater | 0 | 2 | No inventory |
| Exeter Water Dept | Rockingham County | 12,236 | Surface water | 14 | 1 | No inventory |
| Bethlehem Village Dist | Grafton County | 1,750 | Surface water | 22 | 1 | No inventory |
| Village District of Eidelweiss | Carroll County | 1,200 | Groundwater | 7 | 1 | No inventory |
| Rosebrook Water | Coos County | 1,050 | Groundwater | 2 | 1 | No inventory |
| W Stewartstown Water PCT | Coos County | 428 | Purchased groundwater | 0 | 1 | No inventory |
| Crotched Mountain School | Hillsborough County | 300 | Groundwater | 6 | 1 | No inventory |
| Wediko School | Hillsborough County | 280 | Groundwater | 5 | 1 | No inventory |
| Tamworth Pines | Carroll County | 130 | Groundwater | 0 | 1 | No inventory |
| Westgate Estates | Rockingham County | 115 | Groundwater | 3 | 1 | No inventory |
| Soda Brook | Merrimack County | 64 | Groundwater | 1 | 1 | No inventory |
| Packers Falls Village | Strafford County | 60 | Groundwater | 1 | 1 | No inventory |
| Rolling Ridge | Carroll County | 58 | Groundwater | 16 | 1 | No inventory |
| Haven at Lee | Strafford County | 51 | Groundwater | 1 | 1 | No inventory |
| Riversbend | Carroll County | 50 | Groundwater | 2 | 1 | No inventory |
| Pine Valley Estates | Rockingham County | 40 | Groundwater | 3 | 1 | No inventory |
| Rockwood Terrace Condos | Hillsborough County | 25 | Groundwater | 4 | 1 | No inventory |
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