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ST JOHN WATER DISTRICT 2

PWS ID: LA1095002 · LAPLACE, Louisiana 70068

PFAS Detected

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

Population Served
3,702
Total Violations
130
Health-Based Violations
76
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
1,006
County
St. John the Baptist Parish
School/Daycare
No
MCL Violations
72
Monitoring Violations
38
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 72 2011
Consumer Confidence Rule Other 11 2017
Interim Enhanced Surface Water Treatment Rule MR 11 2015
Total Haloacetic Acids (HAA5) MR 8 2017
TTHM MR 8 2017
Surface Water Treatment Rule MR 8 2009
Surface Water Treatment Rule TT 4 2016
Lead and Copper Rule MR 3 2019
Public Notice Other 2 2009

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 5 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
NEtFOSAA 9/12/2023 <0.005 µg/L 0.005 µg/L Not Detected
lithium 9/12/2023 <9 µg/L 9 µg/L Not Detected
PFTrDA 9/12/2023 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 9/12/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 9/12/2023 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 6/6/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 6/6/2023 <9 µg/L 9 µg/L Not Detected
PFTrDA 6/6/2023 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 6/6/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 6/6/2023 <0.008 µg/L 0.008 µg/L Not Detected
4:2 FTS 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/6/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/6/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/6/2023 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 6/6/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHxS 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 6/6/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/6/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/6/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/6/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 6/6/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFBA 6/6/2023 0.0052 µg/L 0.005 µg/L Detected
PFBS 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 6/6/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFOA 6/6/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 6/6/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 6/6/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFOS 3/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 3/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 3/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 3/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 3/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 3/15/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 3/15/2023 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 3/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 3/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 3/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 3/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 3/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 3/15/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFOA 3/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
NMeFOSAA 3/15/2023 <0.006 µg/L 0.006 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.