Surface Water Treatment Rule (SWTR) violations in New Hampshire
4 active public water systems in New Hampshire had a Surface Water Treatment Rule (SWTR) violation in the past three years. What Surface Water Treatment Rule (SWTR) is and why it matters.
Systems with a Surface Water Treatment Rule (SWTR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Contoocook Village Pct Hopkinton · Merrimack County |
1,600 | 3 | 0 | |
|
Greenville Water Dept Greenville · Hillsborough County |
1,100 | 2 | 0 | |
|
Andover Village Dist Andover · Merrimack County |
650 | 6 | 4 | |
|
New Hampton Village Pct New Hampton · Belknap County |
600 | 4 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Surface Water Treatment Rule (SWTR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Surface Water Treatment Rule (SWTR) alone.
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.