What was found in Castledale'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 | 150.05 µg/L 12% of the EPA limit 1300 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 614.51 µg/L — CLAWSON WATER SYSTEM · 200 people · 2019 | 8/8 | SYR4 |
| Nitrate | 200 µg/L 2% of the EPA limit 10000 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 300 µg/L — EMERY · 315 people · 2019 | 3/8 | SYR4 |
| Fluoride | 200 µg/L 5% of the EPA limit 4000 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 226.96 µg/L — FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 3/8 | SYR4 |
| Barium | 102.72 µg/L 5.1% of the EPA limit 2000 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 115.925 µg/L — FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 4/8 | SYR4 |
| TTHM | 9.245 µg/L 12% of the EPA limit 80 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 78.12 µg/L — ORANGEVILLE · 1,420 people · 2019 | 8/8 | SYR4 |
| Chloroform | 3.82 µg/L No EPA limit set Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 76.525 µg/L — ORANGEVILLE · 1,420 people · 2019 | 8/8 | SYR4 |
| Chromium | 76 µg/L 76% of the EPA limit 100 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019 | 1/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 38.415 µg/L 64% of the EPA limit 60 µg/L Highest in the city: CASTLEDALE · 1,700 people · 2019 | 7/8 | SYR4 |
| Monochloroacetic Acid | 26.8 µg/L No EPA limit set Highest in the city: CASTLEDALE · 1,700 people · 2019 | 5/8 | SYR4 |
| Dichloroacetic Acid | 1.68 µg/L No EPA limit set Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 19.07 µg/L — ORANGEVILLE · 1,420 people · 2019 | 8/8 | SYR4 |
| Trichloroacetic Acid | 17.74 µg/L No EPA limit set Highest in the city: ORANGEVILLE · 1,420 people · 2019 | 7/8 | SYR4 |
| Toluene | 13 µg/L 1.3% of the EPA limit 1000 µg/L Highest in the city: FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 1/8 | SYR4 |
| Xylenes, Total | 12.35 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the city: FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 1/8 | SYR4 |
| Dichloromethane | 10.25 µg/L 205% of the EPA limit, at the 95th percentile of samples — 5 µg/L Highest in the city: FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 1/8 | SYR4 |
| Bromodichloromethane | 2.345 µg/L No EPA limit set Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 10.06 µg/L — CLAWSON WATER SYSTEM · 200 people · 2019 | 8/8 | SYR4 |
| Lead | 3.41 µg/L 23% of the EPA limit 15 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 9.64 µg/L — CLEVELAND WATER SYSTEM · 509 people · 2019 | 8/8 | SYR4 |
| Benzene | 7.9735 µg/L 159% of the EPA limit, at the 95th percentile of samples — 5 µg/L Highest in the city: FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 1/8 | SYR4 |
| Gross Beta Particle Activity | 0.6500 pCi/L No EPA limit set Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 4.275 pCi/L — FERRON - CASTLE VALLEY SSD · 1,660 people · 2018 | 2/8 | SYR4 |
| Cyanide | 3 µg/L 1.5% of the EPA limit 200 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019 | 2/8 | SYR4 |
| Dibromochloromethane | 1.375 µg/L No EPA limit set Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 2.92 µg/L — FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 8/8 | SYR4 |
| Ethylbenzene | 2.68 µg/L 0.4% of the EPA limit 700 µg/L Highest in the city: FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 1/8 | SYR4 |
| Chlorobenzene | 2.3075 µg/L 2.3% of the EPA limit 100 µg/L Highest in the city: FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 1/8 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.2 pCi/L 8% of the EPA limit 15 pCi/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019
Highest in the city: 1.6 pCi/L — ORANGEVILLE · 1,420 people · 2017 | 3/8 | SYR4 |
| Dibromoacetic Acid | 1.18 µg/L No EPA limit set Highest in the city: ELMO TOWN · 368 people · 2019 | 2/8 | SYR4 |
| Arsenic | 1.17 µg/L 12% of the EPA limit 10 µg/L Highest in the city: ORANGEVILLE · 1,420 people · 2019 | 3/8 | SYR4 |
| Selenium | 1.1 µg/L 2.2% of the EPA limit 50 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019 | 2/8 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Highest in the city: CLEVELAND WATER SYSTEM · 509 people · 2019 | 2/8 | SYR4 |
| Bromoform | 0.6900 µg/L No EPA limit set Highest in the city: FERRON - CASTLE VALLEY SSD · 1,660 people · 2019 | 3/8 | SYR4 |
| Mercury | 0.5000 µg/L 25% of the EPA limit 2 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019 | 1/8 | SYR4 |
| Cadmium | 0.3000 µg/L 6% of the EPA limit 5 µg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2019 | 1/8 | SYR4 |
| Lead | 0.0024 mg/L 16% of the EPA limit 0.0150 mg/L Main supplier: HUNTINGTON - CASTLE VALLEY SSD · 2,129 people · 2025
Highest in the city: 0.0065 mg/L — ELMO TOWN · 368 people · 2025 | 8/8 | 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 Castledale
| Supplier | Population served |
|---|---|
| HUNTINGTON - CASTLE VALLEY SSD | 2,129 |
| CASTLEDALE | 1,700 |
| FERRON - CASTLE VALLEY SSD | 1,660 |
| ORANGEVILLE | 1,420 |
| CLEVELAND WATER SYSTEM | 509 |
| ELMO TOWN | 368 |
| EMERY | 315 |
| CLAWSON WATER SYSTEM | 200 |
Frequently asked questions about Castledale tap water
Is Castledale tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Castledale. 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 Castledale?
8 public water suppliers report drinking-water monitoring for Castledale, Utah to the EPA. Each is listed above with its population served.
What contaminants are in Castledale's water?
The contaminants EPA monitoring detected in Castledale include Copper, Nitrate, Fluoride, Barium, TTHM. 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.