What was found in Londonderry's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 7210 µg/L 72% of the EPA limit 10000 µg/L | 8/17 | SYR4 |
| Copper | 2520 µg/L 194% of the EPA limit, in the worst sample — 1300 µg/L | 16/17 | SYR4 |
| Fluoride | 1300 µg/L 33% of the EPA limit 4000 µg/L | 5/17 | SYR4 |
| Lead | 447 µg/L 2980% of the EPA limit, in the worst sample — 15 µg/L | 14/17 | SYR4 |
| Gross Alpha, Excl. Radon And U | 62.8 pCi/L 419% of the EPA limit, in the worst sample — 15 pCi/L | 9/17 | SYR4 |
| Barium | 46.2 µg/L 2.3% of the EPA limit 2000 µg/L | 11/17 | SYR4 |
| Combined Uranium | 32.2 µg/L 107% of the EPA limit, in the worst sample — 30 µg/L | 9/17 | SYR4 |
| TTHM | 26 µg/L 33% of the EPA limit 80 µg/L | 8/17 | SYR4 |
| Chloroform | 20 µg/L No EPA limit set | 8/17 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20 µg/L 33% of the EPA limit 60 µg/L | 6/17 | SYR4 |
| Monochloroacetic Acid | 15 µg/L No EPA limit set | 3/17 | SYR4 |
| Arsenic | 12.5 µg/L 125% of the EPA limit, in the worst sample — 10 µg/L | 10/17 | SYR4 |
| Dichloroacetic Acid | 11 µg/L No EPA limit set | 5/17 | SYR4 |
| Trichloroacetic Acid | 8 µg/L No EPA limit set | 4/17 | SYR4 |
| Combined Radium (-226 And -228) | 7.9 pCi/L 158% of the EPA limit, in the worst sample — 5 pCi/L | 9/17 | SYR4 |
| Bromodichloromethane | 6 µg/L No EPA limit set | 8/17 | SYR4 |
| Dibromochloromethane | 5.4 µg/L No EPA limit set | 8/17 | SYR4 |
| Toluene | 4.7 µg/L 0.5% of the EPA limit 1000 µg/L | 2/17 | SYR4 |
| Chromium | 4 µg/L 4% of the EPA limit 100 µg/L | 9/17 | SYR4 |
| Dibromoacetic Acid | 1.9 µg/L No EPA limit set | 4/17 | SYR4 |
| Bromoform | 1.8 µg/L No EPA limit set | 5/17 | SYR4 |
| Lead | 0.2250 mg/L 1500% above the EPA limit of 0.0150 mg/L | 7/17 | LCR |
| Mercury | 0.1600 µg/L 8% of the EPA limit 2 µg/L | 1/17 | SYR4 |
| PFOA | 0.0064 µg/L No EPA limit set | 1/17 | UCMR-5 |
Water suppliers serving Londonderry
| Supplier | Population served |
|---|---|
| LONDONDERRY | 6,255 |
| BROOK PARK ESTS | 880 |
| AVERY ESTATES | 383 |
| MINISTERIAL/PARRISH HILLS | 305 |
| OAKRIDGE CONDOS | 250 |
| SPRINGWOOD HILLS | 228 |
| HARVEST VILLAGE | 185 |
| OLDE COUNTRY VILLAGE | 130 |
| PONDEROSA MHP | 110 |
| HANAFIN FARM | 105 |
| PINEHAVEN WATER TRUST | 95 |
| ROLLING MEADOWS CONDOS I | 88 |
| BOUMIL GROVE CONDOS | 72 |
| ROLLING MEADOWS CONDOS III | 50 |
| ROLLING MEADOWS CONDOS IV | 42 |
| SOUTHVIEW CONDOS | 38 |
| BITIM APARTMENTS | 28 |
Frequently asked questions about Londonderry tap water
Is Londonderry tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Londonderry. 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 Londonderry?
17 public water suppliers report drinking-water monitoring for Londonderry, New Hampshire to the EPA. Each is listed above with its population served.
What contaminants are in Londonderry's water?
The contaminants EPA monitoring detected in Londonderry include Nitrate, Copper, Fluoride, Lead, Gross Alpha, Excl. Radon And U. The full list, with the highest level found 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.