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Tap water quality report

Nashua, NH

EPA monitoring detected 21 contaminants across the 2 water suppliers serving Nashua. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
88,938
people served
21
contaminants found
New Hampshire rankings Lead in New Hampshire PFAS in New Hampshire

What was found in Nashua'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
680 µg/L 6.8%
of the EPA limit 10000 µg/L
 1/2 SYR4
Fluoride
419 µg/L 10%
of the EPA limit 4000 µg/L
 1/2 SYR4
Copper
274.882 µg/L 21%
of the EPA limit 1300 µg/L
 2/2 SYR4
Barium
118 µg/L 5.9%
of the EPA limit 2000 µg/L
 2/2 SYR4
Lead
82.8013 µg/L 552%
of the EPA limit, in the worst sample — 15 µg/L
 1/2 SYR4
TTHM
72 µg/L 90%
of the EPA limit 80 µg/L
 2/2 SYR4
Chloroform
52 µg/L
No EPA limit set
 2/2 SYR4
Total Haloacetic Acids (HAA5)
30 µg/L 50%
of the EPA limit 60 µg/L
 1/2 SYR4
Arsenic
19.2 µg/L 192%
of the EPA limit, in the worst sample — 10 µg/L
 1/2 SYR4
Bromodichloromethane
17 µg/L
No EPA limit set
 2/2 SYR4
Dichloroacetic Acid
17 µg/L
No EPA limit set
 1/2 SYR4
Trichloroacetic Acid
13 µg/L
No EPA limit set
 1/2 SYR4
Lithium
11.3 µg/L
No EPA limit set
 1/2 UCMR-5
Dibromochloromethane
6.6 µg/L
No EPA limit set
 2/2 SYR4
Di(2-ethylhexyl) Phthalate
2.6 µg/L 43%
of the EPA limit 6 µg/L
 1/2 SYR4
Dibromoacetic Acid
2.2 µg/L
No EPA limit set
 1/2 SYR4
Bromoform
1.2 µg/L
No EPA limit set
 2/2 SYR4
Toluene
0.8000 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/2 SYR4
Gross Alpha, Excl. Radon And U
0.7000 pCi/L 4.7%
of the EPA limit 15 pCi/L
 1/2 SYR4
Combined Radium (-226 And -228)
0.5000 pCi/L 10%
of the EPA limit 5 pCi/L
 2/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 1/2 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 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 Nashua

SupplierPopulation served
PENNICHUCK WATER WORKS 88,853
FARLEY RD ESTATES 85

Frequently asked questions about Nashua tap water

Is Nashua tap water safe to drink?

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

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

What contaminants are in Nashua's water?

The contaminants EPA monitoring detected in Nashua include Nitrate, Fluoride, Copper, Barium, Lead. 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.