303 DWID
PWS ID: AZ0409053 · ST JOHNS, Arizona 85936
Population Served
75
Total Violations
202
Health-Based Violations
12
Water Source
Groundwater
System Details
- System Type
- Transient Non-Community
- Owner Type
- Private
- Connections
- 17
- County
- Navajo
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 171
- Treatment Tech Violations
- 7
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 26 | 2016 |
| Chlorine | MR | 24 | 2009 |
| Nitrate | MR | 24 | 2024 |
| E. COLI | MR | 6 | 2022 |
| Coliform (TCR) | MCL | 5 | 2010 |
| Public Notice | Other | 5 | 2023 |
| Consumer Confidence Rule | Other | 4 | 2009 |
| Groundwater Rule | TT | 4 | 2025 |
| TTHM | MR | 3 | 2009 |
| Revised Total Coliform Rule | TT | 3 | 2022 |
| 1,1-Dichloroethylene | MR | 2 | 1998 |
| trans-1,2-Dichloroethylene | MR | 2 | 1998 |
| 1,2-Dichloropropane | MR | 2 | 1998 |
| CHLOROBENZENE | MR | 2 | 1998 |
| Benzene | MR | 2 | 1998 |
| Ethylbenzene | MR | 2 | 1998 |
| cis-1,2-Dichloroethylene | MR | 2 | 1998 |
| Revised Total Coliform Rule | MON | 2 | 2017 |
| Revised Total Coliform Rule | RPT | 2 | 2018 |
| Nitrite | MR | 2 | 2013 |
| Arsenic | MR | 2 | 1989 |
| Selenium | MR | 2 | 1989 |
| Toluene | MR | 2 | 1998 |
| Mercury | MR | 2 | 1989 |
| 1,2-Dichloroethane | MR | 2 | 1998 |
| Cadmium | MR | 2 | 1989 |
| Carbon tetrachloride | MR | 2 | 1998 |
| DICHLOROMETHANE | MR | 2 | 1998 |
| 1,1,2-Trichloroethane | MR | 2 | 1998 |
| Chromium | MR | 2 | 1989 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.