SNOQUALMIE PASS UTILITY DISTRICT
PWS ID: WA5381048 · Snoqualmie Pass, Washington 98068
Population Served
5,805
Total Violations
322
Health-Based Violations
10
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 902
- County
- King
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 305
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MR | 35 | 2023 |
| Nitrate | MR | 13 | 2007 |
| Coliform (TCR) | MCL | 10 | 1996 |
| Pentachlorophenol | MR | 7 | 2014 |
| 2,4,5-TP | MR | 7 | 2014 |
| BHC-GAMMA | MR | 6 | 2005 |
| Toxaphene | MR | 6 | 2005 |
| Picloram | MR | 6 | 2014 |
| Dinoseb | MR | 6 | 2014 |
| Dalapon | MR | 6 | 2014 |
| Coliform (TCR) | MR | 6 | 2006 |
| Endrin | MR | 6 | 2005 |
| Methoxychlor | MR | 6 | 2005 |
| cis-1,2-Dichloroethylene | MR | 5 | 2005 |
| DICHLOROMETHANE | MR | 5 | 2005 |
| p-Dichlorobenzene | MR | 5 | 2005 |
| Vinyl chloride | MR | 5 | 2005 |
| 1,2-Dichloroethane | MR | 5 | 2005 |
| 1,1,1-Trichloroethane | MR | 5 | 2005 |
| Carbon tetrachloride | MR | 5 | 2005 |
| Tetrachloroethylene | MR | 5 | 2005 |
| CHLOROBENZENE | MR | 5 | 2005 |
| Toluene | MR | 5 | 2005 |
| Styrene | MR | 5 | 2005 |
| Di(2-ethylhexyl) adipate | MR | 5 | 2005 |
| Simazine | MR | 5 | 2005 |
| Atrazine | MR | 5 | 2005 |
| LASSO | MR | 5 | 2005 |
| Heptachlor | MR | 5 | 2005 |
| HEXACHLOROBENZENE | MR | 5 | 2005 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NMeFOSAA | 5/20/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFBS | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 5/20/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| HFPO-DA | 5/20/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 5/20/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFBA | 5/20/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NEtFOSAA | 5/20/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 5/20/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NFDHA | 5/20/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| 9Cl-PF3ONS | 5/20/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| lithium | 5/20/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFMPA | 5/20/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 5/20/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 5/20/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFNA | 5/20/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 11Cl-PF3OUdS | 5/20/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOA | 5/20/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 6:2 FTS | 5/20/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 5/20/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 5/20/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 11/19/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| ADONA | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 11/19/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFUnA | 11/19/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFBS | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxS | 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 |
| PFOS | 11/19/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 11/19/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| HFPO-DA | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDoA | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 11/19/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFHxA | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 11/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 11/19/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NEtFOSAA | 11/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 11/19/2024 | <9 µg/L | 9 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.