Mattawa City of
PWS ID: WA5352000 · Mattawa, Washington 99349
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
5,015
Total Violations
227
Health-Based Violations
14
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,000
- County
- Grant
- School/Daycare
- No
- MCL Violations
- 14
- Monitoring Violations
- 205
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 15 | 1999 |
| Nitrate | MR | 13 | 2014 |
| Coliform (TCR) | MCL | 13 | 1997 |
| Cadmium | MR | 7 | 2014 |
| Fluoride | MR | 7 | 2014 |
| Nickel | MR | 7 | 2014 |
| Selenium | MR | 7 | 2014 |
| Antimony, Total | MR | 7 | 2014 |
| Chromium | MR | 7 | 2014 |
| Mercury | MR | 7 | 2014 |
| Beryllium, Total | MR | 7 | 2014 |
| Thallium, Total | MR | 7 | 2014 |
| Barium | MR | 7 | 2014 |
| CYANIDE | MR | 7 | 2014 |
| Arsenic | MR | 7 | 2014 |
| Consumer Confidence Rule | Other | 5 | 2023 |
| Pentachlorophenol | MR | 4 | 2008 |
| cis-1,2-Dichloroethylene | MR | 2 | 2014 |
| DICHLOROMETHANE | MR | 2 | 2014 |
| Vinyl chloride | MR | 2 | 2014 |
| trans-1,2-Dichloroethylene | MR | 2 | 2014 |
| 1,2-Dichloroethane | MR | 2 | 2014 |
| 1,1,1-Trichloroethane | MR | 2 | 2014 |
| Tetrachloroethylene | MR | 2 | 2014 |
| CHLOROBENZENE | MR | 2 | 2014 |
| Toluene | MR | 2 | 2014 |
| Ethylbenzene | MR | 2 | 2014 |
| Picloram | MR | 2 | 2008 |
| Dinoseb | MR | 2 | 2008 |
| BHC-GAMMA | MR | 2 | 2008 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| lithium | 8/29/2024 | 14.0000 µg/L | 9 µg/L | Detected |
| lithium | 3/5/2024 | 12.2000 µg/L | 9 µg/L | Detected |
| PFTA | 3/5/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NMeFOSAA | 3/5/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 3/5/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 3/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 3/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 3/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 3/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 3/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 3/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| HFPO-DA | 3/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDA | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 3/5/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| ADONA | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 3/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 3/5/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFBS | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 3/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 3/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 3/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDoA | 3/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 3/5/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFTrDA | 10/30/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| 8:2 FTS | 10/30/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 10/30/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NEtFOSAA | 10/30/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTA | 10/30/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFPeA | 10/30/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 10/30/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFMBA | 10/30/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 10/30/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 10/30/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 10/30/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NMeFOSAA | 10/30/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFHpA | 10/30/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 10/30/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 10/30/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 10/30/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 10/30/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 10/30/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 10/30/2024 | <0.005 µg/L | 0.005 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.