State Hub
New Hampshire Water Quality
131
Utilities in database
0.8M
Residents served
0
With open violations
47
PFAS monitored
Quick Answer
New Hampshire public drinking water is served by 131 EPA-tracked water systems, providing service to approximately 0.8 million residents through public utilities. No open health-based violations are currently recorded across tracked systems in the EPA federal database. 47 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 55% of NH residents use private wells, which fall outside federal utility compliance monitoring.
No open health-based violations are currently recorded in the EPA SDWIS database for New Hampshire's tracked water systems. Always verify with your utility's Consumer Confidence Report for annual test results.
Drinking Water in New Hampshire
New Hampshire has 131 community water systems serving approximately 0.8 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, nitrates. 55% of New Hampshire residents rely on private wells. DES holds primary enforcement authority under the Safe Drinking Water Act.
Safest Large Utilities
New Hampshire systems with no open health violations serving 10,000+ residents.
Utilities in New Hampshire
1–25 of 131Manchester Water Works
NH1471010 · 123,500 served
Pennichuck Water Works
NH1621010 · 89,073 served
Concord Water Dept
NH0501010 · 44,215 served
Portsmouth Water Works
NH1951010 · 33,000 served
Keene Water Dept
NH1241010 · 30,000 served
Dover Water Dept
NH0651010 · 29,000 served
Merrimack Village Dist
NH1531010 · 25,500 served
Rochester Water Dept
NH2001010 · 25,000 served
Salem Water Dept
NH2051010 · 21,000 served
Aquarion Water/nh
NH1051010 · 18,950 served
Derry Water Dept
NH0611010 · 17,290 served
Laconia Water Works
NH1281010 · 17,000 served
Hudson Water Dept
NH1201010 · 16,700 served
Unh/durham Water Sys
NH0691010 · 16,000 served
Seabrook Water Dept
NH2111010 · 14,000 served
Lebanon Water Dept
NH1321010 · 13,600 served
Exeter Water Dept
NH0801010 · 12,236 served
Somersworth Water Works
NH2151010 · 12,000 served
Pease Trade Port
NH1951020 · 9,900 served
Hanover Water Dept
NH1071010 · 9,600 served
Berlin Water Works
NH0231010 · 9,575 served
Milford Water Utilities Dept
NH1561010 · 9,500 served
Claremont Water Dept
NH0461010 · 9,000 served
Franklin Water Works
NH0851010 · 7,200 served
Hampstead Area Water
NH1031010 · 7,153 served
Key Contaminant Concerns in New Hampshire
These contaminants appear most frequently in New Hampshire utility records or pose elevated risk in this region based on EPA data.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always caused by human activity — nitrate is converted in the digestive system to nitrite, which then reacts with hemoglobin to form methemoglobin, a form of hemoglobin that cannot carry oxygen. In the body, nitrite also reacts with amines in food to form N-nitroso compounds (nitrosamines) — known carcinogens classified by the IARC as Group 2A (probable human carcinogens). The United States applies over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination in U.S. groundwater.
EPA limit: 10 mg/L
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
City Water Reports in New Hampshire
Tap water quality pages for New Hampshire cities — violations, PFAS records, utility profiles, and official source links.
Independent Water Testing
Find a certified lab in New Hampshire
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. New Hampshire labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in New Hampshire
Manchester Water Works
Violation history, PFAS records, and official source links
Pennichuck Water Works
Violation history, PFAS records, and official source links
Concord Water Dept
Violation history, PFAS records, and official source links
PFAS monitoring records — New Hampshire
47 water systems in New Hampshire with EPA UCMR 5 records
Lead in New Hampshire drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in New Hampshire drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in New Hampshire
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About New Hampshire Drinking Water
Does New Hampshire drinking water have PFAS?
47 New Hampshire water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which New Hampshire water utilities have open violations?
Browse New Hampshire utility compliance records and violation history
How do I test my water in New Hampshire?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from NH tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do New Hampshire PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is New Hampshire water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
New Hampshire Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-22