EPCOR - SAN TAN
PWS ID: AZ0411128 · SAN TAN VALLEY, Arizona 85143
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
87,435
Total Violations
367
Health-Based Violations
13
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 26,986
- County
- Pinal
- School/Daycare
- No
- MCL Violations
- 13
- Monitoring Violations
- 341
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 42 | 2024 |
| Coliform (TCR) | MR | 30 | 2015 |
| Chlorine | MR | 23 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 16 | 2018 |
| TTHM | MR | 16 | 2018 |
| Combined Radium (-226 and -228) | MR | 8 | 2015 |
| Nitrate | MCL | 7 | 2017 |
| Coliform (TCR) | MCL | 6 | 2012 |
| 1,2,4-Trichlorobenzene | MR | 5 | 2024 |
| cis-1,2-Dichloroethylene | MR | 5 | 2024 |
| DICHLOROMETHANE | MR | 5 | 2024 |
| o-Dichlorobenzene | MR | 5 | 2024 |
| p-Dichlorobenzene | MR | 5 | 2024 |
| 1,1-Dichloroethylene | MR | 5 | 2024 |
| trans-1,2-Dichloroethylene | MR | 5 | 2024 |
| 1,2-Dichloropropane | MR | 5 | 2024 |
| Trichloroethylene | MR | 5 | 2024 |
| 1,1,2-Trichloroethane | MR | 5 | 2024 |
| Tetrachloroethylene | MR | 5 | 2024 |
| Benzene | MR | 5 | 2024 |
| Styrene | MR | 5 | 2024 |
| Toluene | MR | 5 | 2024 |
| Consumer Confidence Rule | Other | 5 | 2007 |
| Xylenes, Total | MR | 5 | 2024 |
| Carbon tetrachloride | MR | 5 | 2024 |
| CHLOROBENZENE | MR | 5 | 2024 |
| Radium-226 | MR | 5 | 2004 |
| Radium-228 | MR | 5 | 2004 |
| E. COLI | MR | 5 | 2020 |
| 1,1,1-Trichloroethane | MR | 5 | 2024 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 14 of 420 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| lithium | 7/24/2024 | 143.0000 µg/L | 9 µg/L | Detected |
| 4:2 FTS | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 7/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 7/24/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 7/24/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFEESA | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 7/24/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFHpS | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 7/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOA | 7/24/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeS | 7/24/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFBA | 7/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 7/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/24/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 7/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 7/24/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 7/24/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 7/24/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpA | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTrDA | 7/24/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFDoA | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 7/24/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 7/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxS | 7/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 4:2 FTS | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 7/17/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 7/17/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 7/17/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 7/17/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFHpS | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 7/17/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 7/17/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFMBA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 7/17/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 7/17/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxS | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 7/17/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 7/17/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 7/17/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 7/17/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/17/2024 | <0.002 µg/L | 0.002 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.