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States → Missouri

ST LOUIS CITY PWS

PWS ID: MO6010715 · ST LOUIS, Missouri 63110-0000

PFAS Detected

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

Population Served
304,709
Total Violations
27
Health-Based Violations
0
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
95,667
County
St. Louis city
School/Daycare
No
MCL Violations
0
Monitoring Violations
26
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Simazine MR 8 2022
Atrazine MR 8 2022
LASSO MR 8 2022
Interim Enhanced Surface Water Treatment Rule MR 2 2006

PFAS Testing Results (UCMR5)

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

Contaminant Date Result MRL Status
PFOA 9/18/2024 <0.004 µg/L 0.004 µg/L Not Detected
lithium 9/18/2024 45.3000 µg/L 9 µg/L Detected
PFBS 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 9/18/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 9/18/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 9/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 9/18/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 9/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 9/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 9/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 9/18/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFDA 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 9/18/2024 <0.002 µg/L 0.002 µg/L Not Detected
NEtFOSAA 9/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 9/18/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 9/18/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 9/18/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 9/18/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 9/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 9/18/2024 <0.02 µg/L 0.02 µg/L Not Detected
NMeFOSAA 9/18/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 9/18/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 9/18/2024 45.3000 µg/L 9 µg/L Detected
PFTA 9/18/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 9/18/2024 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 9/18/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/3/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 6/3/2024 <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.