What was found in Hudson'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 | 2120.25 µg/L 21% of the EPA limit 10000 µg/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 2/3 | SYR4 |
| Copper | 451.2 µg/L 35% of the EPA limit 1300 µg/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2018 | 3/3 | SYR4 |
| Fluoride | 358 µg/L 9% of the EPA limit 4000 µg/L Highest in the city: FRANCOEUR APT/HUDSON MOTOR INN · 58 people · 2018 | 1/3 | SYR4 |
| TTHM | 43.8 µg/L 55% of the EPA limit 80 µg/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 3/3 | SYR4 |
| Barium | 42.6528 µg/L 2.1% of the EPA limit 2000 µg/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2017 | 2/3 | SYR4 |
| Chloroform | 25.55 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 2/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.5850 pCi/L 3.9% of the EPA limit 15 pCi/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2015
Highest in the city: 23.4 pCi/L — HUDSON MOBILE HOME ESTS · 220 people · 2017 | 2/3 | SYR4 |
| Arsenic | 22.6 µg/L 226% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: HUDSON MOBILE HOME ESTS · 220 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 14.95 µg/L 25% of the EPA limit 60 µg/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 11.9335 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 7.295 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 1/3 | SYR4 |
| Dichloroacetic Acid | 6.3 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 5.9405 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 3/3 | SYR4 |
| Lead | 1.935 µg/L 13% of the EPA limit 15 µg/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2018
Highest in the city: 5.12 µg/L — HUDSON MOBILE HOME ESTS · 220 people · 2018 | 3/3 | SYR4 |
| Monochloroacetic Acid | 5 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 1/3 | SYR4 |
| Chromium | 1.1396 µg/L 1.1% of the EPA limit 100 µg/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2017
Highest in the city: 4.45075 µg/L — HUDSON MOBILE HOME ESTS · 220 people · 2017 | 2/3 | SYR4 |
| Dibromoacetic Acid | 1.7 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.255 pCi/L 25% of the EPA limit 5 pCi/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2015 | 2/3 | SYR4 |
| Bromoform | 1.155 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2019 | 3/3 | SYR4 |
| PFOA | 0.0090 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2025 | 1/3 | UCMR-5 |
| Pfpea | 0.0050 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2025 | 1/3 | UCMR-5 |
| Pfhxa | 0.0040 µg/L No EPA limit set Main supplier: HUDSON WATER DEPT · 16,700 people · 2025 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: HUDSON WATER DEPT · 16,700 people · 2024 | 1/3 | 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 Hudson
| Supplier | Population served |
|---|---|
| HUDSON WATER DEPT | 16,700 |
| HUDSON MOBILE HOME ESTS | 220 |
| FRANCOEUR APT/HUDSON MOTOR INN | 58 |
Frequently asked questions about Hudson tap water
Is Hudson tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Hudson. 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 Hudson?
3 public water suppliers report drinking-water monitoring for Hudson, New Hampshire to the EPA. Each is listed above with its population served.
What contaminants are in Hudson's water?
The contaminants EPA monitoring detected in Hudson include Nitrate, Copper, Fluoride, 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.