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States → Louisiana

ASSUMPTION PARISH WW DISTRICT 1

PWS ID: LA1007001 · NAPOLEONVILLE, Louisiana 70390

PFAS Detected

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

Population Served
21,366
Total Violations
208
Health-Based Violations
168
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
9,760
County
Assumption Parish
School/Daycare
No
MCL Violations
118
Monitoring Violations
9
Treatment Tech Violations
50

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 70 2015
TTHM MCL 40 2014
Interim Enhanced Surface Water Treatment Rule TT 27 2016
CARBON, TOTAL TT 15 2011
Total Haloacetic Acids (HAA5) MCL 8 2019
Surface Water Treatment Rule TT 8 1994
Consumer Confidence Rule Other 5 2008
Revised Total Coliform Rule MON 5 2017
TTHM MR 4 2014
Public Notice Other 3 2013

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 4 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
11Cl-PF3OUdS 9/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 9/24/2024 11.3000 µg/L 9 µg/L Detected
PFHpA 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 9/24/2024 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 9/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 9/24/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFUnA 9/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFOS 9/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 9/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxA 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 9/24/2024 0.0061 µg/L 0.005 µg/L Detected
PFPeA 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 9/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 9/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 9/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 9/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 9/24/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 9/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 9/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 9/24/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFNA 9/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 9/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFMPA 6/18/2024 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 6/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 6/18/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 6/18/2024 <0.008 µg/L 0.008 µg/L Not Detected
NMeFOSAA 6/18/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 6/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 6/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/18/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 6/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 6/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 6/18/2024 <9 µg/L 9 µg/L Not Detected
4:2 FTS 6/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 6/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 6/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 6/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/18/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/18/2024 <0.002 µg/L 0.002 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.