WHY DWID
PWS ID: AZ0410118 · AJO, Arizona 85321
Population Served
400
Total Violations
563
Health-Based Violations
68
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 113
- County
- Pima
- School/Daycare
- No
- MCL Violations
- 68
- Monitoring Violations
- 455
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 62 | 2018 |
| Coliform (TCR) | MR | 52 | 2015 |
| Arsenic | MR | 34 | 2022 |
| Chlorine | MR | 26 | 2022 |
| Xylenes, Total | MR | 16 | 2018 |
| 1,2,4-Trichlorobenzene | MR | 14 | 2018 |
| o-Dichlorobenzene | MR | 14 | 2018 |
| p-Dichlorobenzene | MR | 14 | 2018 |
| 1,2-Dichloroethane | MR | 14 | 2018 |
| Carbon tetrachloride | MR | 14 | 2018 |
| 1,2-Dichloropropane | MR | 14 | 2018 |
| Trichloroethylene | MR | 14 | 2018 |
| Tetrachloroethylene | MR | 14 | 2018 |
| Benzene | MR | 14 | 2018 |
| Toluene | MR | 14 | 2018 |
| Styrene | MR | 14 | 2018 |
| trans-1,2-Dichloroethylene | MR | 14 | 2018 |
| 1,1,1-Trichloroethane | MR | 14 | 2018 |
| 1,1,2-Trichloroethane | MR | 14 | 2018 |
| Ethylbenzene | MR | 14 | 2018 |
| cis-1,2-Dichloroethylene | MR | 14 | 2018 |
| DICHLOROMETHANE | MR | 14 | 2018 |
| 1,1-Dichloroethylene | MR | 14 | 2018 |
| CHLOROBENZENE | MR | 14 | 2018 |
| Revised Total Coliform Rule | RPT | 13 | 2024 |
| Lead and Copper Rule | MR | 10 | 2023 |
| Vinyl chloride | MR | 9 | 2018 |
| Consumer Confidence Rule | Other | 8 | 2022 |
| Nitrate | MR | 6 | 2006 |
| TTHM | MR | 6 | 2021 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.