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Tap water quality report

Holderness, NH

EPA monitoring detected 9 contaminants across the 2 water suppliers serving Holderness. 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
281
people served
9
contaminants found
New Hampshire rankings Lead in New Hampshire PFAS in New Hampshire

What was found in Holderness'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
1810.5 µg/L 45%
of the EPA limit 4000 µg/L
Main supplier: TOWN LINE VILLAGE · 193 people · 2018
2/2 SYR4
Nitrate
1600 µg/L 16%
of the EPA limit 10000 µg/L
Main supplier: TOWN LINE VILLAGE · 193 people · 2019
1/2 SYR4
Copper
513.5 µg/L 40%
of the EPA limit 1300 µg/L
Main supplier: TOWN LINE VILLAGE · 193 people · 2019
2/2 SYR4
Barium
10 µg/L 0.5%
of the EPA limit 2000 µg/L
Main supplier: TOWN LINE VILLAGE · 193 people · 2018
1/2 SYR4
Lead
3 µg/L 20%
of the EPA limit 15 µg/L
Main supplier: TOWN LINE VILLAGE · 193 people · 2019
Highest in the city: 4.24 µg/L — HIGHLAND COLONY · 88 people · 2018
2/2 SYR4
trans-1,2-Dichloroethylene
2.04 µg/L 2%
of the EPA limit 100 µg/L
Highest in the city: HIGHLAND COLONY · 88 people · 2019
1/2 SYR4
Chloroform
0.5000 µg/L
No EPA limit set
Highest in the city: HIGHLAND COLONY · 88 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
0.3000 pCi/L 6%
of the EPA limit 5 pCi/L
Highest in the city: HIGHLAND COLONY · 88 people · 2016
1/2 SYR4
Lead
0.0170 mg/L 113%
above the EPA limit of 0.0150 mg/L
Main supplier: TOWN LINE VILLAGE · 193 people · 2012
Highest in the city: 0.0320 mg/L — HIGHLAND COLONY · 88 people · 2021
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 Holderness

SupplierPopulation served
TOWN LINE VILLAGE 193
HIGHLAND COLONY 88

Frequently asked questions about Holderness tap water

Is Holderness tap water safe to drink?

EPA testing detected 9 contaminants in the water serving Holderness. 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 Holderness?

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

What contaminants are in Holderness's water?

The contaminants EPA monitoring detected in Holderness 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.