What was found in Sonoita'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 | 964.5 µg/L 9.6% of the EPA limit 10000 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2019
Highest in the city: 2200 µg/L — CASAS ARROYO ASSOCIATION INC · 27 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 639 µg/L 6.4% of the EPA limit 10000 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2013
Highest in the city: 2200 µg/L — CASAS ARROYO ASSOCIATION INC · 27 people · 2012 | 2/3 | SYR4 |
| Barium | 397.2 µg/L 20% of the EPA limit 2000 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2018 | 3/3 | SYR4 |
| Fluoride | 159 µg/L 4% of the EPA limit 4000 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2018
Highest in the city: 370 µg/L — SONOITA VALLEY (NORTH) WATER COMPANY · 49 people · 2014 | 3/3 | SYR4 |
| Copper | 216.5 µg/L 17% of the EPA limit 1300 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2018
Highest in the city: 366 µg/L — SONOITA VALLEY (NORTH) WATER COMPANY · 49 people · 2017 | 3/3 | SYR4 |
| Combined Uranium | 40.79 µg/L 136% of the EPA limit, at the 95th percentile of samples — 30 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2019 | 1/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 30 pCi/L 200% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2019 | 1/3 | SYR4 |
| TTHM | 5.52 µg/L 6.9% of the EPA limit 80 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2019
Highest in the city: 11.9 µg/L — SONOITA VALLEY (NORTH) WATER COMPANY · 49 people · 2019 | 3/3 | SYR4 |
| Arsenic | 5.34 µg/L 53% of the EPA limit 10 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2018 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5 µg/L 8.3% of the EPA limit 60 µg/L Highest in the city: SONOITA VALLEY (NORTH) WATER COMPANY · 49 people · 2019 | 1/3 | SYR4 |
| Trichloroacetic Acid | 5 µg/L No EPA limit set Highest in the city: SONOITA VALLEY (NORTH) WATER COMPANY · 49 people · 2019 | 1/3 | SYR4 |
| Lead | 4.8 µg/L 32% of the EPA limit 15 µg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2018 | 3/3 | SYR4 |
| Combined Radium (-226 And -228) | 1 pCi/L 20% of the EPA limit 5 pCi/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2019 | 2/3 | SYR4 |
| Bromoform | 0.6000 µg/L No EPA limit set Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 0.6000 µg/L No EPA limit set Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0080 mg/L 53% of the EPA limit 0.0150 mg/L Main supplier: SONOITA VALLEY (SOUTH) WATER COMPANY · 169 people · 2024 | 3/3 | LCR |
Water suppliers serving Sonoita
| Supplier | Population served |
|---|---|
| SONOITA VALLEY (SOUTH) WATER COMPANY | 169 |
| SONOITA VALLEY (NORTH) WATER COMPANY | 49 |
| CASAS ARROYO ASSOCIATION INC | 27 |
Frequently asked questions about Sonoita tap water
Is Sonoita tap water safe to drink?
EPA testing detected 16 contaminants in the water serving Sonoita. 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 Sonoita?
3 public water suppliers report drinking-water monitoring for Sonoita, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Sonoita's water?
The contaminants EPA monitoring detected in Sonoita include Nitrate, Nitrate-Nitrite, Barium, Fluoride, Copper. 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.