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Tap water quality report

Peterborough, NH

EPA monitoring detected 9 contaminants across the 1 water supplier serving Peterborough. 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.

1
water supplier
4,500
people served
9
contaminants found
New Hampshire rankings Lead in New Hampshire PFAS in New Hampshire

What was found in Peterborough'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
Copper
566 µg/L 44%
of the EPA limit 1300 µg/L
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2019
1/1 SYR4
Lead
21.9 µg/L 146%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2019
1/1 SYR4
TTHM
11.645 µg/L 15%
of the EPA limit 80 µg/L
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2019
1/1 SYR4
Bromoform
4.825 µg/L
No EPA limit set
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2019
1/1 SYR4
Dibromochloromethane
4.02 µg/L
No EPA limit set
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2019
1/1 SYR4
Bromodichloromethane
2.53 µg/L
No EPA limit set
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2019
1/1 SYR4
Chloroform
1.74 µg/L
No EPA limit set
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
1.1 pCi/L 22%
of the EPA limit 5 pCi/L
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2017
1/1 SYR4
Lead
0.0090 mg/L 60%
of the EPA limit 0.0150 mg/L
Main supplier: PETERBOROUGH WATER WORKS · 4,500 people · 2024
1/1 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 Peterborough

SupplierPopulation served
PETERBOROUGH WATER WORKS 4,500

Frequently asked questions about Peterborough tap water

Is Peterborough tap water safe to drink?

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

1 public water supplier report drinking-water monitoring for Peterborough, New Hampshire to the EPA. Each is listed above with its population served.

What contaminants are in Peterborough's water?

The contaminants EPA monitoring detected in Peterborough include Copper, Lead, TTHM, Bromoform, Dibromochloromethane. 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.