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States → Louisiana

CITY OF OPELOUSAS WATER SYSTEM

PWS ID: LA1097010 · OPELOUSAS, Louisiana 70571-1879

PFAS Detected

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

Population Served
20,388
Total Violations
140
Health-Based Violations
77
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
6,790
County
St. Landry Parish
School/Daycare
No
MCL Violations
38
Monitoring Violations
12
Treatment Tech Violations
39

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Groundwater Rule TT 39 2025
Coliform (TCR) MCL 38 2013
Consumer Confidence Rule Other 12 2024
TTHM MR 4 2014
Lead and Copper Rule MR 4 2018
Total Haloacetic Acids (HAA5) MR 4 2014
Public Notice Other 2 2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 118 samples detected PFAS.

Contaminant Date Result MRL Status
PFEESA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 8/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 8/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/11/2025 <0.02 µg/L 0.02 µg/L Not Detected
11Cl-PF3OUdS 8/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
lithium 8/11/2025 18.3000 µg/L 9 µg/L Detected
NMeFOSAA 8/11/2025 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 8/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 8/11/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/11/2025 <0.008 µg/L 0.008 µg/L Not Detected
9Cl-PF3ONS 8/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFBS 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/11/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 8/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/11/2025 29.8000 µg/L 9 µg/L Detected
4:2 FTS 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 8/11/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 8/11/2025 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 8/11/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFHpS 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFOS 8/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 8/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 8/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/11/2025 <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.