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Tap water quality report

Thornton, NH

EPA monitoring detected 17 contaminants across the 10 water suppliers serving Thornton. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

10
water suppliers
1,180
people served
17
contaminants found
New Hampshire rankings Lead in New Hampshire PFAS in New Hampshire

What was found in Thornton's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
12600 µg/L 126%
of the EPA limit, in the worst sample — 10000 µg/L
 5/10 SYR4
Fluoride
3100 µg/L 78%
of the EPA limit 4000 µg/L
 9/10 SYR4
Lead
1082.5 µg/L 7217%
of the EPA limit, in the worst sample — 15 µg/L
 9/10 SYR4
Copper
652.2 µg/L 50%
of the EPA limit 1300 µg/L
 10/10 SYR4
Nitrate-Nitrite
260 µg/L 2.6%
of the EPA limit 10000 µg/L
 1/10 SYR4
Combined Uranium
51 µg/L 170%
of the EPA limit, in the worst sample — 30 µg/L
 8/10 SYR4
Barium
47.8 µg/L 2.4%
of the EPA limit 2000 µg/L
 8/10 SYR4
Gross Alpha, Excl. Radon And U
20.3 pCi/L 135%
of the EPA limit, in the worst sample — 15 pCi/L
 9/10 SYR4
Chloroform
12 µg/L
No EPA limit set
 1/10 SYR4
Combined Radium (-226 And -228)
2.4 pCi/L 48%
of the EPA limit 5 pCi/L
 7/10 SYR4
Bromodichloromethane
2.3 µg/L
No EPA limit set
 1/10 SYR4
Chromium
2 µg/L 2%
of the EPA limit 100 µg/L
 2/10 SYR4
Di(2-ethylhexyl) Phthalate
1.2 µg/L 20%
of the EPA limit 6 µg/L
 1/10 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 1/10 SYR4
Tetrachloroethylene
0.9000 µg/L 18%
of the EPA limit 5 µg/L
 1/10 SYR4
Toluene
0.7700 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/10 SYR4
Lead
0.5660 mg/L 3773%
above the EPA limit of 0.0150 mg/L
 4/10 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 single worst sample on record — 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 Thornton

SupplierPopulation served
OWLS NEST GOLF CLUB AND CONDOS 272
WHITE MOUNTAIN RESORT/GATEWAY 213
MOUNTAIN RIVER CONDOS EAST 200
MILL BROOK VILLAGE 113
175 ESTATES 100
STAR RIDGE 96
MOUNTAIN RIVER CONDOS 60
WATERVILLE ACRES CONDOS 50
NORTHPOINTE WATER 48
BIRCH BEND 28

Frequently asked questions about Thornton tap water

Is Thornton tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Thornton. 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 Thornton?

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

What contaminants are in Thornton's water?

The contaminants EPA monitoring detected in Thornton include Nitrate, Fluoride, Lead, Copper, Nitrate-Nitrite. The full list, with the highest level found 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.