TOPPENISH WATER DEPARTMENT
PWS ID: WA5388850 · Toppenish, Washington 98948
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
8,950
Total Violations
8
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 2,627
- County
- Yakima
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 4
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 1 | 2014 |
| TTHM | MR | 1 | 2025 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2025 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 300 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NEtFOSAA | 8/22/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 8/22/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| lithium | 8/22/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFTA | 8/22/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 8/22/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NMeFOSAA | 8/22/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 8/22/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTA | 8/22/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| lithium | 8/22/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFTrDA | 8/22/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NMeFOSAA | 8/22/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 8/22/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 8/22/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 8/22/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| lithium | 8/22/2023 | <9 µg/L | 9 µg/L | Not Detected |
| lithium | 8/22/2023 | 22.6000 µg/L | 9 µg/L | Detected |
| PFTA | 8/22/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NEtFOSAA | 8/22/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 8/22/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 8/22/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 8/22/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| lithium | 8/22/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFTrDA | 8/22/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 8/22/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 8/22/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| 8:2 FTS | 2/21/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBS | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 2/21/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 2/21/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFBA | 2/21/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 2/21/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| ADONA | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 2/21/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 2/21/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 2/21/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 2/21/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFPeA | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 2/21/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDoA | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 2/21/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 2/21/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| HFPO-DA | 2/21/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDA | 2/21/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 2/21/2023 | <9 µg/L | 9 µg/L | Not Detected |
| PFHxS | 2/21/2023 | <0.003 µg/L | 0.003 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.