All water systems in New Hampshire
2,451 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Manchester Water Works Manchester · Hillsborough County |
123,500 | 0 | 0 | |
|
Pennichuck Water Works Nashua · Hillsborough County |
88,853 | 0 | 0 | |
|
Concord Water Dept Concord · Merrimack County |
44,215 | 0 | 0 | |
|
Aquarion Water/nh Hampton · Rockingham County |
34,000 | 1 | 0 | |
|
Portsmouth Water Works Portsmouth · Rockingham County |
33,000 | 0 | 0 | |
|
Keene Water Dept Keene · Cheshire County |
30,000 | 0 | 0 | |
|
Dover Water Dept Dover · Strafford County |
29,000 | 0 | 0 | |
|
Merrimack Village Dist Merrimack · Hillsborough County |
25,500 | 0 | 0 | |
|
Rochester Water Dept Rochester · Strafford County |
25,000 | 1 | 1 | |
|
Salem Water Dept Salem · Rockingham County |
21,080 | 1 | 0 | |
|
Derry Water Dept Derry · Rockingham County |
17,528 | 0 | 0 | |
|
Laconia Water Works Laconia · Belknap County |
17,125 | 0 | 0 | |
|
Hudson Water Dept Hudson · Hillsborough County |
16,700 | 1 | 0 | |
|
Unh/durham Water Sys Durham · Strafford County |
16,000 | 0 | 0 | |
|
Seabrook Water Dept Seabrook · Rockingham County |
14,000 | 1 | 0 | |
|
Lebanon Water Dept Lebanon · Grafton County |
13,600 | 1 | 0 | |
|
Exeter Water Dept Exeter · Rockingham County |
12,236 | 2 | 1 | |
|
Somersworth Water Works Somersworth · Strafford County |
12,200 | 0 | 0 | |
|
Pease Trade Port Portsmouth · Rockingham County |
9,900 | 0 | 0 | |
|
Hanover Water Dept Hanover · Grafton County |
9,600 | 0 | 0 | |
|
Berlin Water Works Berlin · Coos County |
9,575 | 0 | 0 | |
|
Milford Water Utilities Dept Milford · Hillsborough County |
9,500 | 1 | 0 | |
|
Claremont Water Dept Claremont · Sullivan County |
9,000 | 2 | 0 | |
|
Franklin Water Works Franklin · Merrimack County |
7,200 | 0 | 0 | |
|
Hampstead Area Water Hampstead · Rockingham County |
7,153 | 0 | 0 | |
|
Litchfield Litchfield · Hillsborough County |
6,920 | 0 | 0 | |
|
Plymouth Vlg Water and Sewer Plymouth · Grafton County |
6,700 | 0 | 0 | |
|
Littleton Water and Light Littleton · Grafton County |
6,500 | 1 | 0 | |
|
Londonderry Londonderry · Rockingham County |
6,255 | 0 | 0 | |
|
Wolfeboro Water and Sewer Wolfeboro · Carroll County |
6,000 | 0 | 0 | |
|
North Conway Water Pct Conway · Carroll County |
5,500 | 0 | 0 | |
|
Pembroke Water Works Pembroke · Merrimack County |
5,200 | 0 | 0 | |
|
Newmarket Water Works Newmarket · Rockingham County |
5,030 | 0 | 0 | |
|
Newport Water Works Newport · Sullivan County |
5,000 | 0 | 0 | |
|
Central Hooksett Water Pct Hooksett · Merrimack County |
4,650 | 0 | 0 | |
|
Peterborough Water Works Peterborough · Hillsborough County |
4,500 | 1 | 0 | |
|
Rye Water Dist Rye · Rockingham County |
4,300 | 1 | 0 | |
|
Lower Bartlett Water Pct Bartlett · Carroll County |
3,850 | 0 | 0 | |
|
Jaffrey Water Works Jaffrey · Cheshire County |
3,800 | 0 | 0 | |
|
Penacook Boscawen Water Pct Boscawen · Merrimack County |
3,800 | 0 | 0 | |
|
Meredith Water Dept Meredith · Belknap County |
3,750 | 2 | 1 | |
|
Bristol Water Works Bristol · Grafton County |
3,575 | 0 | 0 | |
|
Village Dist of Eastman Grantham · Sullivan County |
3,400 | 1 | 0 | |
|
Lincoln Water Works Lincoln · Grafton County |
3,300 | 0 | 0 | |
|
Raymond Water Dept Raymond · Rockingham County |
3,300 | 1 | 0 | |
|
Farmington Water Dept Farmington · Strafford County |
3,250 | 0 | 0 | |
|
Goffstown Village Pct Goffstown · Hillsborough County |
3,250 | 3 | 0 | |
|
New London Springfield Water New London · Merrimack County |
3,250 | 0 | 0 | |
|
Waterville Valley Water Dist Waterville Valley · Grafton County |
3,150 | 0 | 0 | |
|
Cogswell Springs Water Works Henniker · Merrimack County |
3,000 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The New Hampshire records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.