What was found in Newcastle'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 | 400 µg/L 10% of the EPA limit 4000 µg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018
Highest in the city: 700 µg/L — SALT CREEK WATER DISTRICT · 600 people · 2019 | 5/7 | SYR4 |
| Nitrate | 700 µg/L 7% of the EPA limit 10000 µg/L Highest in the city: WATER UNLIMITED, INCORPORATED · 144 people · 2014 | 1/7 | SYR4 |
| Nitrate-Nitrite | 240 µg/L 2.4% of the EPA limit 10000 µg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2019
Highest in the city: 665 µg/L — WATER UNLIMITED, INCORPORATED · 144 people · 2019 | 5/7 | SYR4 |
| Copper | 224.25 µg/L 17% of the EPA limit 1300 µg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018
Highest in the city: 398 µg/L — WATER UNLIMITED, INCORPORATED · 144 people · 2018 | 7/7 | SYR4 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018 | 5/7 | SYR4 |
| Chromium | 70 µg/L 70% of the EPA limit 100 µg/L Highest in the city: WATER UNLIMITED, INCORPORATED · 144 people · 2019 | 1/7 | SYR4 |
| Lead | 4.4 µg/L 29% of the EPA limit 15 µg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018
Highest in the city: 20.4 µg/L — WATER UNLIMITED, INCORPORATED · 144 people · 2018 | 7/7 | SYR4 |
| Gross Alpha, Excl. Radon And U | 7.765 pCi/L 52% of the EPA limit 15 pCi/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018 | 4/7 | SYR4 |
| Arsenic | 6.25 µg/L 63% of the EPA limit 10 µg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018
Highest in the city: 6.8 µg/L — SALT CREEK WATER DISTRICT · 600 people · 2019 | 5/7 | SYR4 |
| Selenium | 5 µg/L 10% of the EPA limit 50 µg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018 | 5/7 | SYR4 |
| Combined Radium (-226 And -228) | 3.5 pCi/L 70% of the EPA limit 5 pCi/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018 | 4/7 | SYR4 |
| Combined Uranium | 3 µg/L 10% of the EPA limit 30 µg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2018 | 3/7 | SYR4 |
| 2,4-D | 1.1 µg/L 1.6% of the EPA limit 70 µg/L Highest in the city: WATER UNLIMITED, INCORPORATED · 144 people · 2019 | 1/7 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: NEWCASTLE, CITY OF · 3,595 people · 2025
Highest in the city: 0.0040 mg/L — CANYON IMPROVEMENT & SERVICE DISTRICT · 79 people · 2025 | 7/7 | LCR |
Water suppliers serving Newcastle
| Supplier | Population served |
|---|---|
| NEWCASTLE, CITY OF | 3,595 |
| SALT CREEK WATER DISTRICT | 600 |
| WEST END WATER DISTRICT | 225 |
| CAMBRIA I&S DISTRICT | 148 |
| WATER UNLIMITED, INCORPORATED | 144 |
| CANYON IMPROVEMENT & SERVICE DISTRICT | 79 |
| SUNSET RANCH WATER DISTRICT | 70 |
Frequently asked questions about Newcastle tap water
Is Newcastle tap water safe to drink?
EPA testing detected 14 contaminants in the water serving Newcastle. 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 Newcastle?
7 public water suppliers report drinking-water monitoring for Newcastle, Wyoming to the EPA. Each is listed above with its population served.
What contaminants are in Newcastle's water?
The contaminants EPA monitoring detected in Newcastle include Fluoride, Nitrate, Nitrate-Nitrite, Copper, 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.