PlainWater
States → Mississippi

CITY OF BAY ST LOUIS

PWS ID: MS0230001 · BAY ST LOUIS, Mississippi 39520

PFAS Detected

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

Population Served
9,284
Total Violations
735
Health-Based Violations
25
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
3,847
County
Hancock
School/Daycare
No
MCL Violations
25
Monitoring Violations
682
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Uranium MR 208 2012
Radium-228 MR 156 2012
Radium-226 MR 146 2012
Gross Alpha, Excl. Radon and U MR 84 2008
Combined Radium (-226 and -228) MR 84 2008
TTHM MCL 20 2024
Public Notice Other 9 2024
Consumer Confidence Rule Other 6 2023
Coliform (TCR) MCL 5 1993
Chlorine MR 4 2018

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 8 of 240 samples detected PFAS.

Contaminant Date Result MRL Status
HFPO-DA 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 2/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 2/28/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 2/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 2/28/2024 13.8000 µg/L 9 µg/L Detected
NMeFOSAA 2/28/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 2/28/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFBA 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 2/28/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFTrDA 2/28/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFPeS 2/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 2/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFUnA 2/28/2024 <0.002 µg/L 0.002 µg/L Not Detected
6:2 FTS 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 2/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 2/28/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFEESA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 2/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 2/28/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 2/28/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 2/28/2024 <0.008 µg/L 0.008 µg/L Not Detected
6:2 FTS 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFDA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 2/28/2024 <0.007 µg/L 0.007 µg/L Not Detected
HFPO-DA 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 2/28/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 2/28/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 2/28/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 2/28/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 2/28/2024 <0.003 µg/L 0.003 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.