What was found in Walpole'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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 3600 µg/L 36% of the EPA limit 10000 µg/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2019 | 1/3 | SYR4 |
| Fluoride | 129.5 µg/L 3.2% of the EPA limit 4000 µg/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2017
Highest in the city: 1081 µg/L — N WALPOLE VILLAGE DIST/HIGH · 125 people · 2019 | 2/3 | SYR4 |
| Copper | 197 µg/L 15% of the EPA limit 1300 µg/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2018
Highest in the city: 256.85 µg/L — N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 3/3 | SYR4 |
| TTHM | 4.1 µg/L 5.1% of the EPA limit 80 µg/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2019
Highest in the city: 15.08 µg/L — N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 3/3 | SYR4 |
| Barium | 9.85 µg/L 0.5% of the EPA limit 2000 µg/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2017
Highest in the city: 13.9 µg/L — N WALPOLE VILLAGE DIST/HIGH · 125 people · 2019 | 3/3 | SYR4 |
| Lead | 8.175 µg/L 55% of the EPA limit 15 µg/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2018 | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.2 pCi/L 8% of the EPA limit 15 pCi/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2016
Highest in the city: 7.7 pCi/L — N WALPOLE VILLAGE DIST/HIGH · 125 people · 2018 | 2/3 | SYR4 |
| Chromium | 7 µg/L 7% of the EPA limit 100 µg/L Highest in the city: N WALPOLE VILLAGE DIST/HIGH · 125 people · 2019 | 2/3 | SYR4 |
| Chloroform | 0.7840 µg/L No EPA limit set Main supplier: WALPOLE WATER DEPT · 1,057 people · 2019
Highest in the city: 6.076 µg/L — N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 1.5 µg/L 5% of the EPA limit 30 µg/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2016
Highest in the city: 5 µg/L — N WALPOLE VILLAGE DIST/HIGH · 125 people · 2018 | 3/3 | SYR4 |
| Bromodichloromethane | 1.25 µg/L No EPA limit set Main supplier: WALPOLE WATER DEPT · 1,057 people · 2019
Highest in the city: 4.7 µg/L — N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4.6 µg/L 7.7% of the EPA limit 60 µg/L Highest in the city: N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 1/3 | SYR4 |
| Trichloroacetic Acid | 2.7 µg/L No EPA limit set Highest in the city: N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 1/3 | SYR4 |
| cis-1,2-Dichloroethylene | 2.44 µg/L 3.5% of the EPA limit 70 µg/L Highest in the city: N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 1/3 | SYR4 |
| 1,1-Dichloroethylene | 2.13 µg/L 30% of the EPA limit 7 µg/L Highest in the city: N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 1.75 µg/L No EPA limit set Main supplier: WALPOLE WATER DEPT · 1,057 people · 2019
Highest in the city: 2.08 µg/L — N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 3/3 | SYR4 |
| Arsenic | 1.95 µg/L 20% of the EPA limit 10 µg/L Highest in the city: N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 1.9 µg/L No EPA limit set Highest in the city: N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.1950 pCi/L 3.9% of the EPA limit 5 pCi/L Main supplier: WALPOLE WATER DEPT · 1,057 people · 2016
Highest in the city: 1.2 pCi/L — N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2016 | 2/3 | SYR4 |
| Bromoform | 1.185 µg/L No EPA limit set Main supplier: WALPOLE WATER DEPT · 1,057 people · 2019 | 1/3 | SYR4 |
| Trichloroethylene | 1.08 µg/L 22% of the EPA limit 5 µg/L Highest in the city: N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 1/3 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L Highest in the city: N WALPOLE VILLAGE DISTRICT/LOW · 625 people · 2019 | 2/3 | SYR4 |
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 Walpole
| Supplier | Population served |
|---|---|
| WALPOLE WATER DEPT | 1,057 |
| N WALPOLE VILLAGE DISTRICT/LOW | 625 |
| N WALPOLE VILLAGE DIST/HIGH | 125 |
Frequently asked questions about Walpole tap water
Is Walpole tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Walpole. 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 Walpole?
3 public water suppliers report drinking-water monitoring for Walpole, New Hampshire to the EPA. Each is listed above with its population served.
What contaminants are in Walpole's water?
The contaminants EPA monitoring detected in Walpole include Nitrate, Fluoride, Copper, TTHM, 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.