Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
| Violation | Type | Status | Period |
|---|---|---|---|
| TT | Health-based | Resolved | 2024-10-17 |
| TT | Health-based | Resolved | 2024-10-17 |
| TT | Health-based | Resolved | 2024-10-17 |
| TT | Health-based | Unaddressed | 2019-07-07 |
| MCL | Health-based | Resolved | 2012-10-01 → 2012-12-31 |
| MCL | Health-based | Resolved | 2012-10-01 → 2012-12-31 |
| MCL | Health-based | Resolved | 2012-01-01 → 2012-03-31 |
| MCL | Health-based | Resolved | 2012-01-01 → 2012-03-31 |
| MCL | Health-based | Resolved | 2012-01-01 → 2012-03-31 |
| Other | Monitoring | Unaddressed | 2025-10-18 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 970 µg/L 9.7% of the EPA limit 10000 µg/L | 32/32 | SYR4 | 2012–2019 |
| Copper | 230 µg/L 18% of the EPA limit 1300 µg/L | 30/30 | SYR4 | 2012–2018 |
| Combined Uranium | 44.9 µg/L 150% of the EPA limit, in the worst sample — 30 µg/L | 27/27 | SYR4 | 2012–2019 |
| Lead | 6.5 µg/L 43% of the EPA limit 15 µg/L | 25/30 | SYR4 | 2012–2018 |
| Gross Alpha, Excl. Radon And U | 93 pCi/L 620% of the EPA limit, in the worst sample — 15 pCi/L | 19/27 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 1.2 pCi/L 24% of the EPA limit 5 pCi/L | 11/27 | SYR4 | 2012–2019 |
| Lead | 0.0080 mg/L 53% of the EPA limit 0.0150 mg/L | 11/11 | LCR | 2024 |
| TTHM | 6.1 µg/L 7.6% of the EPA limit 80 µg/L | 5/10 | SYR4 | 2012–2019 |
| Arsenic | 5.5 µg/L 55% of the EPA limit 10 µg/L | 3/3 | SYR4 | 2012–2018 |
| Barium | 440 µg/L 22% of the EPA limit 2000 µg/L | 3/3 | SYR4 | 2012–2018 |
| Nitrate-Nitrite | 660 µg/L 6.6% of the EPA limit 10000 µg/L | 3/3 | SYR4 | 2012–2013 |
| Fluoride | 160 µg/L 4% of the EPA limit 4000 µg/L | 2/3 | SYR4 | 2012–2018 |
| Bromoform | 0.6000 µg/L No EPA limit set | 1/1 | SYR4 | 2019 |
| Dibromochloromethane | 0.6000 µg/L No EPA limit set | 1/1 | SYR4 | 2019 |
69 contaminants tested, none detected
Utility contact
Frequently asked questions about Sonoita Valley (South) Water Company
Is Sonoita Valley (South) Water Company tap water safe to drink?
EPA monitoring detected 14 contaminants in Sonoita Valley (South) Water Company's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Sonoita Valley (South) Water Company's water?
EPA monitoring detected Nitrate, Copper, Combined Uranium, Lead, Gross Alpha, Excl. Radon And U, and others. The full list with the level and data source for each is above.
How many people does Sonoita Valley (South) Water Company serve?
Sonoita Valley (South) Water Company reports serving 169 people in Arizona, per its EPA record.
Has Sonoita Valley (South) Water Company had any water quality violations?
The EPA has 154 violations on file for Sonoita Valley (South) Water Company, of which 9 are health-based (a contaminant limit or required treatment was breached) and 3 remain open. The rest are monitoring or reporting failures.
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.