AJO IMPROVEMENT COMPANY
PWS ID: AZ0410001 · AJO, Arizona 85321
Population Served
2,654
Total Violations
85
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Public/Private
- Connections
- 1,200
- County
- Pima
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 71
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 20 | 2020 |
| Total Haloacetic Acids (HAA5) | MR | 13 | 2024 |
| TTHM | MR | 13 | 2024 |
| Arsenic | MR | 7 | 2023 |
| Revised Total Coliform Rule | RPT | 6 | 2024 |
| Nitrate | MR | 4 | 2004 |
| Consumer Confidence Rule | Other | 4 | 2015 |
| Coliform (TCR) | MR | 4 | 2005 |
| Revised Total Coliform Rule | MON | 2 | 2016 |
| Cadmium | MR | 1 | 1988 |
| Fluoride | MR | 1 | 1988 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1988 |
| Barium | MR | 1 | 1988 |
| Selenium | MR | 1 | 1988 |
| Mercury | MR | 1 | 1988 |
| Lead and Copper Rule | MR | 1 | 2005 |
| Chromium | MR | 1 | 1988 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.