New Hampshire tap water quality

706 community water systems serving 922,880 people.

Data: U.S. EPA · How we read the data · How we check it

systems with PFAS above a federal limit

222,708

people served by them

systems EPA tested for PFAS

systems above the lead action level

PFAS: EPA's 2023–2025 testing. Lead: results from the last five years. 202 more systems have no recent lead results in EPA's database.

Water systems with PFAS above the federal limit

Based on EPA's UCMR 5 results (2023–2025) compared to the April 2024 limits, the way EPA compares them. Systems have until 2029 to comply. Largest first.

New Hampshire PFAS report: chart, rankings and data to download →

New Hampshire's own PFAS limits

New Hampshire enforces its own drinking water limits for PFAS (effective: 2019-09-30): PFOA 12 ppt, PFOS 15 ppt, PFHxS 18 ppt, PFNA 11 ppt. The federal limits are 4 ppt for PFOA and PFOS.

Env-Dw 705.06, Table 705-7. It applies to community and non-transient non-community systems. MCLGs are zero.

Source: NH Admin. Rules Env-Dw 700, Env-Dw 705.06 MCLs and MCLGs for PFAS, checked 2026-11-14. Utility pages compare each system's EPA results with these limits. State compliance is judged on the state's own sampling.

Largest water systems in New Hampshire

Manchester Water Works
123,500 people · Surface water · New Hampshire
PFOA above limit
Pennichuck Water Works
88,853 people · Surface water · New Hampshire
No PFAS above limits
Concord Water Dept
44,215 people · Surface water · New Hampshire
No PFAS above limits
Aquarion Water/Nh
34,000 people · Groundwater · New Hampshire
PFOA detectedAlso: PFOS detected · Lithium above screening level
Portsmouth Water Works
33,000 people · Surface water · New Hampshire
PFOA above limitAlso: PFOS above limit · PFHxS detected
Keene Water Dept
30,000 people · Surface water · New Hampshire
No PFAS above limits
Dover Water Dept
29,000 people · Groundwater · New Hampshire
Lithium above screening level
Merrimack Village District
25,500 people · Groundwater · New Hampshire
No PFAS above limits
Rochester Water Dept
25,000 people · Surface water · New Hampshire
Total trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violation
Salem Water Dept
21,080 people · Surface water · New Hampshire
PFOA above limit
Derry Water Dept
17,528 people · Purchased surface water · New Hampshire
PFOA detected
Laconia Water Works
17,125 people · Surface water · New Hampshire
No PFAS above limits
Hudson Water Dept
16,700 people · Groundwater · New Hampshire
PFOA above limit
Unh/Durham Water System
16,000 people · Surface water · New Hampshire
No PFAS above limits
Seabrook Water Dept
14,000 people · Groundwater · New Hampshire
PFOA detectedAlso: PFOS detected

New Hampshire cities and towns

Most health-based violations since 2016

New Hampton Village Pct Water System
600 people · Surface water · New Hampshire
Haloacetic acids (HAA5) violationsAlso: Total trihalomethanes (TTHM) violations
Contoocook Village Pct Water System
1,600 people · Surface water · New Hampshire
Haloacetic acids (HAA5) violationsAlso: Total trihalomethanes (TTHM) violations
Bethlehem Village District
1,750 people · Surface water · New Hampshire
Total trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
Rolling Ridge Water System
58 people · Groundwater · New Hampshire
Fluoride violations
Exeter Water Dept
12,236 people · Surface water · New Hampshire
Total trihalomethanes (TTHM) violationsAlso: PFOA detected · PFOS detected
Boumil Grove Condos Water System
72 people · Groundwater · New Hampshire
Gross alpha violationsAlso: Radium (combined 226/228) violations · Coliform bacteria violation
Muirfield Cluster Water System
69 people · Groundwater · New Hampshire
Arsenic violations
New Castle Water Works
910 people · Purchased surface water · New Hampshire
Total trihalomethanes (TTHM) violations
Profile Apartments Water System
90 people · Groundwater · New Hampshire
Coliform bacteria violationsAlso: Gross alpha violations · Radium (combined 226/228) violation
Rockhouse Mountain Water System
480 people · Groundwater · New Hampshire
Coliform bacteria violationsAlso: Uranium violations
Abenaki Water/White Rock Water
238 people · Groundwater · New Hampshire
Arsenic violations
Montrose Condos Water System
210 people · Groundwater · New Hampshire
Arsenic violationsAlso: Coliform bacteria violation
Northpointe Water
48 people · Groundwater · New Hampshire
Nitrate violations
Epsom Healthcare Ctr Water System
240 people · Groundwater · New Hampshire
Arsenic violations
Rolling Acres MHP
100 people · Groundwater · New Hampshire
Uranium violationsAlso: Radium (combined 226/228) violations · Gross alpha violation

All New Hampshire utilities on this site

Every New Hampshire system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 706 systems as CSV.

Questions

Does New Hampshire tap water have PFAS?

EPA tested 49 community water systems in New Hampshire for 29 PFAS between 2023 and 2025. 16 had at least one regulated PFAS detected, and 9 had an entry-point average above a 2024 federal limit. Those 9 systems serve about 222,708 people (24% of people on community water in New Hampshire). Systems have until 2029 to meet the limits.

How many New Hampshire water systems have violations?

228 systems in New Hampshire had at least one health-based violation since 2016 (749 violations in total). 475 violations are currently listed as unaddressed.

Which New Hampshire water systems are over the lead action level?

25 systems had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Another 202 systems have no lead results in EPA's database from the last five years, including 202 whose last result was above the action level. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.