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New Hampshire Water Quality
131
Utilities in database
0.8M
Residents served
55%
On private wells
2
Key contaminants tracked
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.
Utilities in New Hampshire
26–50 of 131Litchfield
NH1371010 · 7,000 served
Plymouth Vlg Water and Sewer
NH1941010 · 6,700 served
Littleton Water and Light
NH1381010 · 6,500 served
Londonderry
NH1391010 · 6,255 served
Wolfeboro Water and Sewer
NH2561010 · 6,000 served
North Conway Water Pct
NH0511030 · 5,500 served
Pembroke Water Works
NH1861010 · 5,200 served
Newmarket Water Works
NH1731010 · 5,030 served
Newport Water Works
NH1741010 · 5,000 served
Central Hooksett Water Pct
NH1181010 · 4,650 served
Peterborough Water Works
NH1871010 · 4,500 served
Rye Water Dist
NH2041010 · 4,300 served
Lower Bartlett Water Pct
NH0161020 · 3,850 served
Penacook Boscawen Water Pct
NH0251010 · 3,800 served
Jaffrey Water Works
NH1221010 · 3,800 served
Meredith Water Dept
NH1521010 · 3,750 served
Bristol Water Works
NH0301010 · 3,575 served
Village Dist of Eastman
NH0951010 · 3,400 served
Raymond Water Dept
NH1971010 · 3,300 served
Lincoln Water Works
NH1351010 · 3,300 served
Goffstown Village Pct
NH0911010 · 3,250 served
New London Springfield Water
NH1721010 · 3,250 served
Farmington Water Dept
NH0811010 · 3,250 served
Waterville Valley Water Dist
NH2441010 · 3,150 served
Hooksett Village Water Pct
NH1181020 · 3,000 served
Key Contaminant Concerns in New Hampshire
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
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.
New Hampshire Water FAQs
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Data source: Utility data from EPA SDWIS. 131 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-22