PlainWater
States → Wisconsin

LA CROSSE WATERWORKS

PWS ID: WI6320309 · LA CROSSE, Wisconsin 54601

PFAS Detected

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

Population Served
53,000
Total Violations
73
Health-Based Violations
12
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
16,176
County
La Crosse
School/Daycare
No
MCL Violations
4
Monitoring Violations
43
Treatment Tech Violations
8

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 33 2023
Public Notice Other 14 2019
Nitrate MR 10 2019
Groundwater Rule TT 8 2013
Coliform (TCR) MCL 4 2006

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 32 of 600 samples detected PFAS.

Contaminant Date Result MRL Status
4:2 FTS 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 5/6/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFDA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 5/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 5/6/2024 <9 µg/L 9 µg/L Not Detected
PFTrDA 5/6/2024 <0.007 µg/L 0.007 µg/L Not Detected
6:2 FTS 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 5/6/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFOS 5/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxS 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 5/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 5/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 5/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 5/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 5/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 5/6/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFMPA 5/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 5/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 5/24/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 5/24/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 5/24/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 5/24/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 5/24/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/24/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 5/24/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 5/24/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 5/24/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 5/24/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFBA 5/24/2023 0.0054 µg/L 0.005 µg/L Detected
PFHxS 5/24/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 5/24/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 5/24/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/24/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 5/24/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 5/24/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 5/24/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 5/24/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 5/24/2023 <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.