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Tap water quality report

Alton, NH

EPA monitoring detected 21 contaminants across the 4 water suppliers serving Alton. 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.

4
water suppliers
2,288
people served
21
contaminants found
New Hampshire rankings Lead in New Hampshire PFAS in New Hampshire

What was found in Alton'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
Nitrate
1000 µg/L 10%
of the EPA limit 10000 µg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2019
4/4 SYR4
Copper
892 µg/L 69%
of the EPA limit 1300 µg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2018
4/4 SYR4
Nitrate-Nitrite
610 µg/L 6.1%
of the EPA limit 10000 µg/L
Highest in the city: LAKESIDE AT WINNIPESAUKEE · 85 people · 2014
2/4 SYR4
Fluoride
283 µg/L 7.1%
of the EPA limit 4000 µg/L
Highest in the city: EAGLES REST MHP · 138 people · 2019
3/4 SYR4
Barium
15.9 µg/L 0.8%
of the EPA limit 2000 µg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2017
Highest in the city: 17.18 µg/L — MERRYMEETING MHP · 265 people · 2018
3/4 SYR4
Total Haloacetic Acids (HAA5)
14.93 µg/L 25%
of the EPA limit 60 µg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2017
1/4 SYR4
Lead
14.1 µg/L 94%
of the EPA limit 15 µg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2018
3/4 SYR4
Dichloroacetic Acid
13.455 µg/L
No EPA limit set
Main supplier: ALTON WATER WORKS · 1,800 people · 2017
1/4 SYR4
Arsenic
11.2844 µg/L 113%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Highest in the city: EAGLES REST MHP · 138 people · 2019
3/4 SYR4
Trichloroacetic Acid
4.8 µg/L
No EPA limit set
Main supplier: ALTON WATER WORKS · 1,800 people · 2017
1/4 SYR4
TTHM
3.185 µg/L 4%
of the EPA limit 80 µg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2017
1/4 SYR4
Gross Alpha, Excl. Radon And U
1.6 pCi/L 11%
of the EPA limit 15 pCi/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2016
Highest in the city: 3.1 pCi/L — EAGLES REST MHP · 138 people · 2016
3/4 SYR4
Combined Uranium
0.3000 µg/L 1%
of the EPA limit 30 µg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2016
Highest in the city: 2.7 µg/L — LAKESIDE AT WINNIPESAUKEE · 85 people · 2015
3/4 SYR4
Chromium
2.469 µg/L 2.5%
of the EPA limit 100 µg/L
Highest in the city: EAGLES REST MHP · 138 people · 2019
1/4 SYR4
Bromoform
2.39 µg/L
No EPA limit set
Main supplier: ALTON WATER WORKS · 1,800 people · 2019
1/4 SYR4
Dibromoacetic Acid
1.3 µg/L
No EPA limit set
Main supplier: ALTON WATER WORKS · 1,800 people · 2017
1/4 SYR4
Antimony, Total
1 µg/L 17%
of the EPA limit 6 µg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2017
1/4 SYR4
Dibromochloromethane
0.9700 µg/L
No EPA limit set
Main supplier: ALTON WATER WORKS · 1,800 people · 2019
1/4 SYR4
Combined Radium (-226 And -228)
0.8950 pCi/L 18%
of the EPA limit 5 pCi/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2016
1/4 SYR4
Bromodichloromethane
0.7950 µg/L
No EPA limit set
Main supplier: ALTON WATER WORKS · 1,800 people · 2019
1/4 SYR4
Lead
0.2100 mg/L 1400%
above the EPA limit of 0.0150 mg/L
Main supplier: ALTON WATER WORKS · 1,800 people · 2024
2/4 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 Alton

SupplierPopulation served
ALTON WATER WORKS 1,800
MERRYMEETING MHP 265
EAGLES REST MHP 138
LAKESIDE AT WINNIPESAUKEE 85

Frequently asked questions about Alton tap water

Is Alton tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Alton. 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 Alton?

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

What contaminants are in Alton's water?

The contaminants EPA monitoring detected in Alton include Nitrate, Copper, Nitrate-Nitrite, Fluoride, Barium. 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.