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Tap water quality report

Henniker, NH

EPA monitoring detected 14 contaminants across the 2 water suppliers serving Henniker. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
3,091
people served
14
contaminants found
New Hampshire rankings Lead in New Hampshire PFAS in New Hampshire

What was found in Henniker's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Fluoride
3140 µg/L 79%
of the EPA limit 4000 µg/L
Highest in the city: LIBERTY RIDGE MHP · 91 people · 2019
1/2 SYR4
Nitrate
1200 µg/L 12%
of the EPA limit 10000 µg/L
Highest in the city: LIBERTY RIDGE MHP · 91 people · 2019
1/2 SYR4
Copper
194 µg/L 15%
of the EPA limit 1300 µg/L
Main supplier: COGSWELL SPRINGS WATER WORKS · 3,000 people · 2019
Highest in the city: 421 µg/L — LIBERTY RIDGE MHP · 91 people · 2019
2/2 SYR4
Barium
39.6 µg/L 2%
of the EPA limit 2000 µg/L
Main supplier: COGSWELL SPRINGS WATER WORKS · 3,000 people · 2018
Highest in the city: 107.6 µg/L — LIBERTY RIDGE MHP · 91 people · 2019
2/2 SYR4
Lead
30.8 µg/L 205%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: COGSWELL SPRINGS WATER WORKS · 3,000 people · 2019
2/2 SYR4
Gross Alpha, Excl. Radon And U
6.175 pCi/L 41%
of the EPA limit 15 pCi/L
Main supplier: COGSWELL SPRINGS WATER WORKS · 3,000 people · 2017
Highest in the city: 11.18 pCi/L — LIBERTY RIDGE MHP · 91 people · 2019
2/2 SYR4
Combined Uranium
0.5950 µg/L 2%
of the EPA limit 30 µg/L
Main supplier: COGSWELL SPRINGS WATER WORKS · 3,000 people · 2017
Highest in the city: 3.7 µg/L — LIBERTY RIDGE MHP · 91 people · 2019
2/2 SYR4
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
Highest in the city: LIBERTY RIDGE MHP · 91 people · 2019
1/2 SYR4
Bromoform
1.2 µg/L
No EPA limit set
Highest in the city: LIBERTY RIDGE MHP · 91 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
0.4900 pCi/L 9.8%
of the EPA limit 5 pCi/L
Main supplier: COGSWELL SPRINGS WATER WORKS · 3,000 people · 2014
Highest in the city: 1.165 pCi/L — LIBERTY RIDGE MHP · 91 people · 2016
2/2 SYR4
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
Highest in the city: LIBERTY RIDGE MHP · 91 people · 2019
1/2 SYR4
Dibromochloromethane
0.8050 µg/L
No EPA limit set
Highest in the city: LIBERTY RIDGE MHP · 91 people · 2019
1/2 SYR4
Mercury
0.2000 µg/L 10%
of the EPA limit 2 µg/L
Highest in the city: LIBERTY RIDGE MHP · 91 people · 2019
1/2 SYR4
Lead
0.0190 mg/L 127%
above the EPA limit of 0.0150 mg/L
Main supplier: COGSWELL SPRINGS WATER WORKS · 3,000 people · 1993
Highest in the city: 0.0230 mg/L — LIBERTY RIDGE MHP · 91 people · 2024
2/2 LCR
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Henniker

SupplierPopulation served
COGSWELL SPRINGS WATER WORKS 3,000
LIBERTY RIDGE MHP 91

Frequently asked questions about Henniker tap water

Is Henniker tap water safe to drink?

EPA testing detected 14 contaminants in the water serving Henniker. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Henniker?

2 public water suppliers report drinking-water monitoring for Henniker, New Hampshire to the EPA. Each is listed above with its population served.

What contaminants are in Henniker's water?

The contaminants EPA monitoring detected in Henniker include Fluoride, Nitrate, Copper, Barium, Lead. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.