What was found in Hillsborough'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 |
|---|---|---|---|
| Fluoride | 4250 µg/L 106% of the EPA limit, at the 95th percentile of samples — 4000 µg/L Highest in the city: EMERALD LAKE · 1,300 people · 2019 | 1/2 | SYR4 |
| Copper | 490 µg/L 38% of the EPA limit 1300 µg/L Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 26.9 µg/L 45% of the EPA limit 60 µg/L Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 1/2 | SYR4 |
| Lead | 22.6 µg/L 151% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 19 µg/L No EPA limit set Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 1/2 | SYR4 |
| TTHM | 9.5 µg/L 12% of the EPA limit 80 µg/L Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 2/2 | SYR4 |
| Chloroform | 9.47 µg/L No EPA limit set Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 2/2 | SYR4 |
| Arsenic | 8.3 µg/L 83% of the EPA limit 10 µg/L Highest in the city: EMERALD LAKE · 1,300 people · 2019 | 1/2 | SYR4 |
| Barium | 5 µg/L 0.3% of the EPA limit 2000 µg/L Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 4.705 µg/L No EPA limit set Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 4.11 µg/L 14% of the EPA limit 30 µg/L Highest in the city: EMERALD LAKE · 1,300 people · 2017 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3.96 µg/L No EPA limit set Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.4000 pCi/L 2.7% of the EPA limit 15 pCi/L Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2016
Highest in the city: 1.65 pCi/L — EMERALD LAKE · 1,300 people · 2017 | 2/2 | SYR4 |
| Bromodichloromethane | 0.5975 µg/L No EPA limit set Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2019
Highest in the city: 1.48 µg/L — EMERALD LAKE · 1,300 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 1.17 µg/L No EPA limit set Highest in the city: EMERALD LAKE · 1,300 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.9000 pCi/L 18% of the EPA limit 5 pCi/L Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2016 | 2/2 | SYR4 |
| Bromoform | 0.8000 µg/L No EPA limit set Highest in the city: EMERALD LAKE · 1,300 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0330 mg/L 220% above the EPA limit of 0.0150 mg/L Main supplier: HILLSBOROUGH WATER WORKS · 2,000 people · 2010 | 1/2 | LCR |
Water suppliers serving Hillsborough
| Supplier | Population served |
|---|---|
| HILLSBOROUGH WATER WORKS | 2,000 |
| EMERALD LAKE | 1,300 |
Frequently asked questions about Hillsborough tap water
Is Hillsborough tap water safe to drink?
EPA testing detected 18 contaminants in the water serving Hillsborough. 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 Hillsborough?
2 public water suppliers report drinking-water monitoring for Hillsborough, New Hampshire to the EPA. Each is listed above with its population served.
What contaminants are in Hillsborough's water?
The contaminants EPA monitoring detected in Hillsborough include Fluoride, Copper, Total Haloacetic Acids (HAA5), Lead, Dichloroacetic Acid. 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.