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MANDEVILLE WATER SUPPLY

PWS ID: LA1103023 · MANDEVILLE, Louisiana 70448

PFAS Detected

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

Population Served
13,000
Total Violations
23
Health-Based Violations
9
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
4,800
County
St. Tammany Parish
School/Daycare
No
MCL Violations
9
Monitoring Violations
6
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 9 2015
TTHM MR 3 2009
Total Haloacetic Acids (HAA5) MR 3 2009

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 180 samples detected PFAS.

Contaminant Date Result MRL Status
NMeFOSAA 4/2/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFDoA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 4/2/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 4/2/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 4/2/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 4/2/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFBS 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 4/2/2024 13.9000 µg/L 9 µg/L Detected
PFPeS 4/2/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 4/2/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFTA 4/2/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFEESA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 4/2/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFMPA 4/2/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 4/2/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 4/2/2024 <0.004 µg/L 0.004 µg/L Not Detected
6:2 FTS 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 4/2/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 4/2/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 4/2/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 4/2/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFDoA 4/2/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 4/2/2024 <0.008 µg/L 0.008 µg/L Not Detected
lithium 4/2/2024 11.6000 µg/L 9 µg/L Detected
8:2 FTS 4/2/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 4/2/2024 <0.007 µg/L 0.007 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.