CASAS ARROYO ASSOCIATION INC
PWS ID: AZ0412020 · SONOITA, Arizona 85637
Population Served
27
Total Violations
121
Health-Based Violations
10
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 27
- County
- Santa Cruz
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 76
- Treatment Tech Violations
- 9
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 23 | 2014 |
| Consumer Confidence Rule | Other | 21 | 2022 |
| Chlorine | MR | 9 | 2019 |
| Nitrate | MR | 8 | 2006 |
| Public Notice | Other | 5 | 2025 |
| Groundwater Rule | TT | 5 | 2025 |
| Revised Total Coliform Rule | RPT | 4 | 2022 |
| LEAD AND COPPER RULE REVISIONS | RPT | 4 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 4 | 2024 |
| Lead and Copper Rule | MR | 3 | 2024 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1989 |
| E. COLI | MR | 2 | 2020 |
| Coliform (TCR) | MCL | 1 | 1999 |
| o-Dichlorobenzene | MR | 1 | 1998 |
| p-Dichlorobenzene | MR | 1 | 1998 |
| 1,1-Dichloroethylene | MR | 1 | 1998 |
| 1,2-Dichloroethane | MR | 1 | 1998 |
| Carbon tetrachloride | MR | 1 | 1998 |
| 1,1,2-Trichloroethane | MR | 1 | 1998 |
| Tetrachloroethylene | MR | 1 | 1998 |
| CHLOROBENZENE | MR | 1 | 1998 |
| Benzene | MR | 1 | 1998 |
| Toluene | MR | 1 | 1998 |
| Ethylbenzene | MR | 1 | 1998 |
| TTHM | MR | 1 | 2004 |
| Chromium | MR | 1 | 1988 |
| Selenium | MR | 1 | 1988 |
| Arsenic | MR | 1 | 1988 |
| 1,2-Dichloropropane | MR | 1 | 1998 |
| cis-1,2-Dichloroethylene | MR | 1 | 1998 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.