What was found in Somerton'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 | 2000 µg/L 20% of the EPA limit 10000 µg/L Highest in the city: Cocopah East · 280 people · 2019 | 2/4 | SYR4 |
| Fluoride | 290 µg/L 7.2% of the EPA limit 4000 µg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2019
Highest in the city: 560 µg/L — Cocopah East · 280 people · 2017 | 2/4 | SYR4 |
| Copper | 519.4 µg/L 40% of the EPA limit 1300 µg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2019 | 1/4 | SYR4 |
| Barium | 71.7 µg/L 3.6% of the EPA limit 2000 µg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2019
Highest in the city: 140 µg/L — Cocopah Bend RV & Golf Resort · 1,095 people · 2019 | 4/4 | SYR4 |
| TTHM | 77.98 µg/L 97% of the EPA limit 80 µg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2019
Highest in the city: 120 µg/L — Cocopah Bend RV & Golf Resort · 1,095 people · 2019 | 4/4 | SYR4 |
| Lithium | 97.7 µg/L No EPA limit set Main supplier: SOMERTON CITY OF · 14,197 people · 2024 | 1/4 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 20.875 µg/L 35% of the EPA limit 60 µg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2019
Highest in the city: 21.95 µg/L — Cocopah Bend RV & Golf Resort · 1,095 people · 2019 | 4/4 | SYR4 |
| Lead | 21.18 µg/L 141% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2019 | 1/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 10.6098 pCi/L 71% of the EPA limit 15 pCi/L Highest in the city: Cocopah East · 280 people · 2019 | 3/4 | SYR4 |
| Gross Beta Particle Activity | 5 pCi/L No EPA limit set Main supplier: SOMERTON CITY OF · 14,197 people · 2019 | 1/4 | SYR4 |
| Combined Uranium | 2.3494 µg/L 7.8% of the EPA limit 30 µg/L Highest in the city: Cocopah East · 280 people · 2019 | 3/4 | SYR4 |
| Arsenic | 1.96 µg/L 20% of the EPA limit 10 µg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2019
Highest in the city: 2.2 µg/L — Cocopah East · 280 people · 2017 | 3/4 | SYR4 |
| Chromium | 2 µg/L 2% of the EPA limit 100 µg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.278 pCi/L 26% of the EPA limit 5 pCi/L Highest in the city: Cocopah Bend RV & Golf Resort · 1,095 people · 2016 | 2/4 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: SOMERTON CITY OF · 14,197 people · 2025
Highest in the city: 0.0027 mg/L — Cocopah Bend RV & Golf Resort · 1,095 people · 2025 | 4/4 | LCR |
Water suppliers serving Somerton
| Supplier | Population served |
|---|---|
| SOMERTON CITY OF | 14,197 |
| Cocopah Bend RV & Golf Resort | 1,095 |
| Cocopah West | 325 |
| Cocopah East | 280 |
Frequently asked questions about Somerton tap water
Is Somerton tap water safe to drink?
EPA testing detected 15 contaminants in the water serving Somerton. 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 Somerton?
4 public water suppliers report drinking-water monitoring for Somerton, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Somerton's water?
The contaminants EPA monitoring detected in Somerton include Nitrate, Fluoride, Copper, 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.