What was found in Tremonton'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 | 5500 µg/L 55% of the EPA limit 10000 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2019 | 5/5 | SYR4 |
| Nitrate-Nitrite | 3000 µg/L 30% of the EPA limit 10000 µg/L Highest in the city: SUNSET PARK WATER CO · 44 people · 2012 | 1/5 | SYR4 |
| Fluoride | 265 µg/L 6.6% of the EPA limit 4000 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2019
Highest in the city: 400 µg/L — SUNSET PARK WATER CO · 44 people · 2017 | 5/5 | SYR4 |
| Copper | 202 µg/L 16% of the EPA limit 1300 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2017
Highest in the city: 267.6 µg/L — SUNSET PARK WATER CO · 44 people · 2019 | 5/5 | SYR4 |
| Barium | 108.32 µg/L 5.4% of the EPA limit 2000 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2019
Highest in the city: 112.205 µg/L — BOTHWELL TOWN WATER SYSTEM · 237 people · 2019 | 5/5 | SYR4 |
| Lithium | 61 µg/L No EPA limit set Main supplier: TREMONTON CITY · 13,000 people · 2024 | 1/5 | UCMR-5 |
| Gross Beta Particle Activity | 9.72 pCi/L No EPA limit set Main supplier: TREMONTON CITY · 13,000 people · 2019
Highest in the city: 16.9 pCi/L — SUNSET PARK WATER CO · 44 people · 2019 | 5/5 | SYR4 |
| Monochloroacetic Acid | 11.6 µg/L No EPA limit set Highest in the city: THATCHER-PENROSE SERVICE DISTRICT · 590 people · 2019 | 1/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 2.195 µg/L 3.7% of the EPA limit 60 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2019
Highest in the city: 11.6 µg/L — THATCHER-PENROSE SERVICE DISTRICT · 590 people · 2019 | 2/5 | SYR4 |
| Selenium | 3.525 µg/L 7% of the EPA limit 50 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2019
Highest in the city: 7.355 µg/L — SUNSET PARK WATER CO · 44 people · 2017 | 5/5 | SYR4 |
| Lead | 2.62 µg/L 17% of the EPA limit 15 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2017
Highest in the city: 7.22 µg/L — THATCHER-PENROSE SERVICE DISTRICT · 590 people · 2018 | 5/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.16 pCi/L 34% of the EPA limit 15 pCi/L Main supplier: TREMONTON CITY · 13,000 people · 2019
Highest in the city: 5.68 pCi/L — BOTHWELL TOWN WATER SYSTEM · 237 people · 2019 | 4/5 | SYR4 |
| TTHM | 5.45 µg/L 6.8% of the EPA limit 80 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2019 | 5/5 | SYR4 |
| Bromoform | 4.49 µg/L No EPA limit set Main supplier: TREMONTON CITY · 13,000 people · 2019 | 5/5 | SYR4 |
| Arsenic | 3.98 µg/L 40% of the EPA limit 10 µg/L Main supplier: TREMONTON CITY · 13,000 people · 2019 | 5/5 | SYR4 |
| Combined Radium (-226 And -228) | 2.5805 pCi/L 52% of the EPA limit 5 pCi/L Main supplier: TREMONTON CITY · 13,000 people · 2014 | 2/5 | SYR4 |
| Dibromoacetic Acid | 2.185 µg/L No EPA limit set Main supplier: TREMONTON CITY · 13,000 people · 2019 | 2/5 | SYR4 |
| Dibromochloromethane | 1.8 µg/L No EPA limit set Main supplier: TREMONTON CITY · 13,000 people · 2019
Highest in the city: 1.87 µg/L — THATCHER-PENROSE SERVICE DISTRICT · 590 people · 2019 | 3/5 | SYR4 |
| Bromodichloromethane | 0.6000 µg/L No EPA limit set Main supplier: TREMONTON CITY · 13,000 people · 2019
Highest in the city: 0.8000 µg/L — THATCHER-PENROSE SERVICE DISTRICT · 590 people · 2019 | 2/5 | SYR4 |
| Chloroform | 0.5000 µg/L No EPA limit set Highest in the city: THATCHER-PENROSE SERVICE DISTRICT · 590 people · 2019 | 1/5 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: TREMONTON CITY · 13,000 people · 2025
Highest in the city: 0.00080 mg/L — THATCHER-PENROSE SERVICE DISTRICT · 590 people · 2025 | 5/5 | 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 Tremonton
| Supplier | Population served |
|---|---|
| TREMONTON CITY | 13,000 |
| THATCHER-PENROSE SERVICE DISTRICT | 590 |
| THATCHER HILLS WATER COMPANY | 399 |
| BOTHWELL TOWN WATER SYSTEM | 237 |
| SUNSET PARK WATER CO | 44 |
Frequently asked questions about Tremonton tap water
Is Tremonton tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Tremonton. 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 Tremonton?
5 public water suppliers report drinking-water monitoring for Tremonton, Utah to the EPA. Each is listed above with its population served.
What contaminants are in Tremonton's water?
The contaminants EPA monitoring detected in Tremonton include Nitrate, Nitrate-Nitrite, Fluoride, 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.