What was found in Northfield'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 | 676 µg/L 6.8% of the EPA limit 10000 µg/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Nitrate-Nitrite | 622 µg/L 6.2% of the EPA limit 10000 µg/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Fluoride | 339.5 µg/L 8.5% of the EPA limit 4000 µg/L Highest in the city: HIGHLANDS VILLAGE DISTRICT · 95 people · 2017 | 3/5 | SYR4 |
| Copper | 310.88 µg/L 24% of the EPA limit 1300 µg/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 4/5 | SYR4 |
| Lead | 66.5 µg/L 443% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 3/5 | SYR4 |
| Barium | 10.225 µg/L 0.5% of the EPA limit 2000 µg/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2018
Highest in the city: 54.41 µg/L — HIGHLANDS VILLAGE DISTRICT · 95 people · 2017 | 4/5 | SYR4 |
| TTHM | 11.9 µg/L 15% of the EPA limit 80 µg/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Chromium | 11.65 µg/L 12% of the EPA limit 100 µg/L Highest in the city: CANTERBURY CROSSINGS · 35 people · 2018 | 1/5 | SYR4 |
| Arsenic | 7.615 µg/L 76% of the EPA limit 10 µg/L Highest in the city: SODA BROOK · 64 people · 2018 | 3/5 | SYR4 |
| Bromodichloromethane | 3.87 µg/L No EPA limit set Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Dibromochloromethane | 3.725 µg/L No EPA limit set Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1 pCi/L 6.7% of the EPA limit 15 pCi/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2015
Highest in the city: 3 pCi/L — SODA BROOK · 64 people · 2015 | 2/5 | SYR4 |
| Chloroform | 2.85 µg/L No EPA limit set Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 2.795 µg/L 4.7% of the EPA limit 60 µg/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Dichloroacetic Acid | 1.685 µg/L No EPA limit set Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Bromoform | 1.36 µg/L No EPA limit set Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Dibromoacetic Acid | 1.3 µg/L No EPA limit set Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Trichloroacetic Acid | 1.1 µg/L No EPA limit set Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2019 | 1/5 | SYR4 |
| Combined Uranium | 1 µg/L 3.3% of the EPA limit 30 µg/L Highest in the city: HIGHLANDS VILLAGE DISTRICT · 95 people · 2014 | 1/5 | SYR4 |
| Combined Radium (-226 And -228) | 0.2900 pCi/L 5.8% of the EPA limit 5 pCi/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2015
Highest in the city: 0.9000 pCi/L — SODA BROOK · 64 people · 2015 | 2/5 | SYR4 |
| Lead | 0.0360 mg/L 240% above the EPA limit of 0.0150 mg/L Main supplier: TILTON NORTHFIELD WATER DIST · 2,500 people · 2014
Highest in the city: 0.0530 mg/L — SODA BROOK · 64 people · 2015 | 4/5 | 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 Northfield
| Supplier | Population served |
|---|---|
| TILTON NORTHFIELD WATER DIST | 2,500 |
| HIGHLANDS VILLAGE DISTRICT | 95 |
| SODA BROOK | 64 |
| CANTERBURY CROSSINGS | 35 |
| CROSS MILL VILLAGE | 28 |
Frequently asked questions about Northfield tap water
Is Northfield tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Northfield. 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 Northfield?
5 public water suppliers report drinking-water monitoring for Northfield, New Hampshire to the EPA. Each is listed above with its population served.
What contaminants are in Northfield's water?
The contaminants EPA monitoring detected in Northfield include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Lead. 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.