What was found in Jamestown'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 | 109 µg/L 8.4% of the EPA limit 1300 µg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2017
Highest in the city: 1063 µg/L — STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2017 | 2/2 | SYR4 |
| Nitrate-Nitrite | 1060 µg/L 11% of the EPA limit 10000 µg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2019 | 2/2 | SYR4 |
| Fluoride | 752 µg/L 19% of the EPA limit 4000 µg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2018 | 2/2 | SYR4 |
| Lithium | 75 µg/L No EPA limit set Main supplier: JAMESTOWN CITY OF · 15,427 people · 2023
Highest in the city: 99.5 µg/L — STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2023 | 2/2 | UCMR-5 |
| Barium | 3.19 µg/L 0.2% of the EPA limit 2000 µg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2018
Highest in the city: 19.7 µg/L — STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2018 | 2/2 | SYR4 |
| Lead | 19.58 µg/L 131% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2017 | 2/2 | SYR4 |
| Dibromoacetic Acid | 10.82 µg/L No EPA limit set Main supplier: JAMESTOWN CITY OF · 15,427 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 8.6 µg/L 14% of the EPA limit 60 µg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2019 | 2/2 | SYR4 |
| Arsenic | 4.88 µg/L 49% of the EPA limit 10 µg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2016 | 2/2 | SYR4 |
| Monobromoacetic Acid | 1.78 µg/L No EPA limit set Main supplier: JAMESTOWN CITY OF · 15,427 people · 2019
Highest in the city: 3.82 µg/L — STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2019 | 2/2 | SYR4 |
| TTHM | 1.602 µg/L 2% of the EPA limit 80 µg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2019
Highest in the city: 3.371 µg/L — STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 2.322 µg/L No EPA limit set Main supplier: JAMESTOWN CITY OF · 15,427 people · 2019 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.57 pCi/L 10% of the EPA limit 15 pCi/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2018 | 1/2 | SYR4 |
| Combined Uranium | 1.54 µg/L 5.1% of the EPA limit 30 µg/L Highest in the city: STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2017 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.6890 pCi/L 14% of the EPA limit 5 pCi/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2018
Highest in the city: 1.36 pCi/L — STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2017 | 2/2 | SYR4 |
| Bromodichloromethane | 0.8925 µg/L No EPA limit set Main supplier: JAMESTOWN CITY OF · 15,427 people · 2019
Highest in the city: 1.083 µg/L — STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2019 | 2/2 | SYR4 |
| Chloroform | 0.9240 µg/L No EPA limit set Main supplier: JAMESTOWN CITY OF · 15,427 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 0.8425 µg/L No EPA limit set Highest in the city: STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2019 | 1/2 | SYR4 |
| Bromoform | 0.7820 µg/L No EPA limit set Highest in the city: STUTSMAN RURAL WATER DISTRICT · 5,550 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0109 mg/L 73% of the EPA limit 0.0150 mg/L Main supplier: JAMESTOWN CITY OF · 15,427 people · 2023 | 2/2 | 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 Jamestown
| Supplier | Population served |
|---|---|
| JAMESTOWN CITY OF | 15,427 |
| STUTSMAN RURAL WATER DISTRICT | 5,550 |
Frequently asked questions about Jamestown tap water
Is Jamestown tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Jamestown. 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 Jamestown?
2 public water suppliers report drinking-water monitoring for Jamestown, North Dakota to the EPA. Each is listed above with its population served.
What contaminants are in Jamestown's water?
The contaminants EPA monitoring detected in Jamestown include Copper, Nitrate-Nitrite, Fluoride, Lithium, 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.