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States → Louisiana

CALCASIEU PARISH WW DISTRICT NO 4

PWS ID: LA1019053 · WESTLAKE, Louisiana 70669

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
5,340
Total Violations
28
Health-Based Violations
18
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,780
County
Calcasieu Parish
School/Daycare
No
MCL Violations
13
Monitoring Violations
2
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 13 2006
Groundwater Rule TT 4 2023
Consumer Confidence Rule Other 3 1999
Lead and Copper Rule MR 2 2019
Public Notice Other 2 2023
LEAD AND COPPER RULE REVISIONS TT 1 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
NEtFOSAA 5/22/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 5/22/2024 <0.008 µg/L 0.008 µg/L Not Detected
NMeFOSAA 5/22/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 5/22/2024 <0.007 µg/L 0.007 µg/L Not Detected
lithium 5/22/2024 14.0000 µg/L 9 µg/L Detected
PFUnA 12/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 12/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 12/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 12/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 12/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 12/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDA 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 12/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 12/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 12/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 12/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 12/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 12/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 12/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 12/9/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 11/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFBA 11/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 11/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 11/20/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 11/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 11/20/2024 <0.002 µg/L 0.002 µg/L Not Detected
HFPO-DA 11/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 11/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 11/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 11/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 11/20/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 11/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 11/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 11/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 11/20/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFHpS 11/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 11/20/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 11/20/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 11/20/2024 14.0000 µg/L 9 µg/L Detected
PFTA 11/20/2024 <0.008 µg/L 0.008 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.