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States → Washington

CHEHALIS WATER DEPARTMENT

PWS ID: WA5312250 · Chehalis, Washington 98532

Population Served
11,426
Total Violations
42
Health-Based Violations
6
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
3,853
County
Lewis
School/Daycare
No
MCL Violations
3
Monitoring Violations
33
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 3 2005
Coliform (TCR) MCL 3 1992
Endrin MR 2 2006
Methoxychlor MR 2 2006
Toxaphene MR 2 2006
Hexachlorocyclopentadiene MR 2 2006
Atrazine MR 2 2006
Heptachlor MR 2 2006
Pentachlorophenol MR 2 2006
Chlordane MR 2 2006
BHC-GAMMA MR 2 2006
Di(2-ethylhexyl) adipate MR 2 2006
Simazine MR 2 2006
Di(2-ethylhexyl) phthalate MR 2 2006
LASSO MR 2 2006
Benzo(a)pyrene MR 2 2006
HEXACHLOROBENZENE MR 2 2006
Consumer Confidence Rule Other 2 2024
Heptachlor epoxide MR 2 2006
Gross Alpha, Excl. Radon and U MR 1 1979

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 30 samples detected PFAS.

Contaminant Date Result MRL Status
6:2 FTS 11/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 11/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 11/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 11/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 11/7/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 11/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 11/7/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 11/7/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 11/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 11/7/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 11/7/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 11/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 11/7/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFBA 11/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 11/7/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 11/7/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 11/7/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 11/7/2024 <9 µg/L 9 µg/L Not Detected
PFPeS 11/7/2024 <0.004 µg/L 0.004 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.