ST JOHNS CITY OF
PWS ID: AZ0401012 · SAINT JOHNS, Arizona 85936
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
3,500
Total Violations
263
Health-Based Violations
8
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,275
- County
- Apache
- School/Daycare
- No
- MCL Violations
- 8
- Monitoring Violations
- 199
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Radium (-226 and -228) | MR | 40 | 2025 |
| Chlorine | MR | 30 | 2022 |
| Consumer Confidence Rule | Other | 27 | 2025 |
| Lead and Copper Rule | MR | 10 | 2023 |
| TTHM | MR | 8 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2025 |
| Coliform (TCR) | MCL | 4 | 2013 |
| Nitrate | MR | 4 | 2006 |
| Revised Total Coliform Rule | RPT | 4 | 2020 |
| Gross Alpha, Excl. Radon and U | MR | 3 | 2004 |
| Coliform (TCR) | MR | 3 | 2008 |
| DICHLOROMETHANE | MR | 3 | 2002 |
| o-Dichlorobenzene | MR | 3 | 2002 |
| 1,2-Dichloropropane | MR | 3 | 2002 |
| Styrene | MR | 3 | 2002 |
| cis-1,2-Dichloroethylene | MR | 3 | 2002 |
| trans-1,2-Dichloroethylene | MR | 3 | 2002 |
| Tetrachloroethylene | MR | 3 | 2002 |
| 1,1,2-Trichloroethane | MR | 3 | 2002 |
| Toluene | MR | 3 | 2002 |
| Combined Radium (-226 and -228) | MCL | 3 | 2001 |
| Ethylbenzene | MR | 3 | 2002 |
| CHLOROBENZENE | MR | 3 | 2002 |
| Revised Total Coliform Rule | MON | 2 | 2018 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2002 |
| p-Dichlorobenzene | MR | 2 | 2002 |
| Carbon tetrachloride | MR | 2 | 2002 |
| Benzene | MR | 2 | 2002 |
| Xylenes, Total | MR | 2 | 2002 |
| 1,1-Dichloroethylene | MR | 2 | 2002 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFBA | 5/13/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 5/13/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFEESA | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 5/13/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 5/13/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 5/13/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 5/13/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 4:2 FTS | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 5/13/2024 | 11.0000 µg/L | 9 µg/L | Detected |
| HFPO-DA | 5/13/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpA | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NEtFOSAA | 5/13/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFNA | 5/13/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFTrDA | 5/13/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| ADONA | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 5/13/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTA | 5/13/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFBS | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 5/13/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 5/13/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 5/13/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 5/13/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 5/13/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 5/13/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFTrDA | 11/19/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| 6:2 FTS | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFPeA | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 11/19/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 11/19/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NMeFOSAA | 11/19/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTA | 11/19/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFBA | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NEtFOSAA | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 11/19/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMBA | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 11/19/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
PFAS data from EPA UCMR5 monitoring program (2023-2025).
This data is provided for informational purposes only.