PlainWater

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.