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States → Louisiana

PLAISANCE WATER SYSTEM

PWS ID: LA1097012 · OPELOUSAS, Louisiana 70570

PFAS Detected

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

Population Served
6,375
Total Violations
60
Health-Based Violations
26
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
2,125
County
St. Landry Parish
School/Daycare
No
MCL Violations
18
Monitoring Violations
22
Treatment Tech Violations
8

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 18 2015
Coliform (TCR) MR 8 2013
Groundwater Rule TT 8 2018
Consumer Confidence Rule Other 6 2024
Total Haloacetic Acids (HAA5) MR 4 2013
Chlorine MR 4 2013
TTHM MR 4 2013
Public Notice Other 2 2015
Lead and Copper Rule MR 2 2017

PFAS Testing Results (UCMR5)

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

Contaminant Date Result MRL Status
PFDoA 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 8/4/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/4/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/4/2025 <0.002 µg/L 0.002 µg/L Not Detected
NEtFOSAA 8/4/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFDA 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 8/4/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/4/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 8/4/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/4/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/4/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/4/2025 <0.002 µg/L 0.002 µg/L Not Detected
NMeFOSAA 8/4/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 8/4/2025 <0.008 µg/L 0.008 µg/L Not Detected
4:2 FTS 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/4/2025 16.4000 µg/L 9 µg/L Detected
PFTrDA 8/4/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFHxA 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/4/2025 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 8/4/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/4/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/4/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/4/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFOA 2/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
6:2 FTS 2/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 2/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 2/12/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 2/12/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFUnA 2/12/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 2/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 2/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 2/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 2/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 2/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 2/12/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 2/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 2/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 2/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 2/12/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 2/12/2025 <0.008 µg/L 0.008 µg/L Not Detected
lithium 2/12/2025 16.3000 µg/L 9 µg/L Detected
NMeFOSAA 2/12/2025 <0.006 µg/L 0.006 µg/L Not Detected
11Cl-PF3OUdS 2/12/2025 <0.005 µg/L 0.005 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.