What was found in Danville'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 |
|---|---|---|---|
| Copper | 182.4 µg/L 14% of the EPA limit 1300 µg/L Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 682 µg/L — COTTON FARMS MHP · 390 people · 2019 | 5/5 | SYR4 |
| Fluoride | 210 µg/L 5.3% of the EPA limit 4000 µg/L Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 624 µg/L — COTTON FARMS MHP · 390 people · 2019 | 4/5 | SYR4 |
| Barium | 21.4 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 104.85 µg/L — SPRUCE VALLEY MHP · 92 people · 2019 | 5/5 | SYR4 |
| Lead | 13.5 µg/L 90% of the EPA limit 15 µg/L Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 72.9 µg/L — COTTON FARMS MHP · 390 people · 2019 | 5/5 | SYR4 |
| TTHM | 4.86 µg/L 6.1% of the EPA limit 80 µg/L Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 31.035 µg/L — COTTON FARMS MHP · 390 people · 2019 | 3/5 | SYR4 |
| Arsenic | 21.7 µg/L 217% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: ROCK RIMMON COOPERATIVE · 200 people · 2019 | 4/5 | SYR4 |
| Combined Uranium | 20.1 µg/L 67% of the EPA limit 30 µg/L Highest in the city: SPRUCE VALLEY MHP · 92 people · 2018 | 4/5 | SYR4 |
| Chloroform | 2.085 µg/L No EPA limit set Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 18.375 µg/L — COTTON FARMS MHP · 390 people · 2019 | 3/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 15.96 pCi/L 106% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Highest in the city: ROCK RIMMON COOPERATIVE · 200 people · 2018 | 4/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.1 µg/L 8.5% of the EPA limit 60 µg/L Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 10.885 µg/L — ROCK RIMMON COOPERATIVE · 200 people · 2019 | 2/5 | SYR4 |
| Nitrite | 10 µg/L 1% of the EPA limit 1000 µg/L Highest in the city: IRON WHEEL MHP · 124 people · 2017 | 1/5 | SYR4 |
| Bromodichloromethane | 2.65 µg/L No EPA limit set Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 9.3875 µg/L — COTTON FARMS MHP · 390 people · 2019 | 3/5 | SYR4 |
| Chromium | 4 µg/L 4% of the EPA limit 100 µg/L Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 9 µg/L — SPRUCE VALLEY MHP · 92 people · 2019 | 5/5 | SYR4 |
| Trichloroacetic Acid | 1.6 µg/L No EPA limit set Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 8 µg/L — COTTON FARMS MHP · 390 people · 2018 | 3/5 | SYR4 |
| Combined Radium (-226 And -228) | 6.685 pCi/L 134% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Highest in the city: ROCK RIMMON COOPERATIVE · 200 people · 2019 | 4/5 | SYR4 |
| Dichloroacetic Acid | 2 µg/L No EPA limit set Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 5.155 µg/L — ROCK RIMMON COOPERATIVE · 200 people · 2019 | 2/5 | SYR4 |
| Dibromochloromethane | 2.3 µg/L No EPA limit set Main supplier: COLBY POND · 485 people · 2019
Highest in the city: 3.1275 µg/L — COTTON FARMS MHP · 390 people · 2019 | 3/5 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L Main supplier: COLBY POND · 485 people · 2019 | 2/5 | SYR4 |
| Lead | 0.0440 mg/L 293% above the EPA limit of 0.0150 mg/L Highest in the city: COTTON FARMS MHP · 390 people · 2015 | 1/5 | 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 Danville
| Supplier | Population served |
|---|---|
| COLBY POND | 485 |
| COTTON FARMS MHP | 390 |
| ROCK RIMMON COOPERATIVE | 200 |
| IRON WHEEL MHP | 124 |
| SPRUCE VALLEY MHP | 92 |
Frequently asked questions about Danville tap water
Is Danville tap water safe to drink?
EPA testing detected 19 contaminants in the water serving Danville. 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 Danville?
5 public water suppliers report drinking-water monitoring for Danville, New Hampshire to the EPA. Each is listed above with its population served.
What contaminants are in Danville's water?
The contaminants EPA monitoring detected in Danville include Copper, Fluoride, Barium, Lead, TTHM. 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.