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States → Wisconsin

TOMAHAWK WATERWORKS

PWS ID: WI7350127 · Tomahawk, Wisconsin 54487

PFAS Detected

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

Population Served
3,180
Total Violations
29
Health-Based Violations
11
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,500
County
Lincoln
School/Daycare
No
MCL Violations
10
Monitoring Violations
0
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 13 2012
Coliform (TCR) MCL 10 2002
LEAD AND COPPER RULE REVISIONS TT 1 2024
Public Notice Other 1 2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 20 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
PFNA 4/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFBA 4/24/2024 0.0078 µg/L 0.005 µg/L Detected
HFPO-DA 4/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 4/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 4/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 4/24/2024 0.0075 µg/L 0.003 µg/L Detected
PFBS 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 4/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 4/24/2024 0.0065 µg/L 0.003 µg/L Detected
6:2 FTS 4/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 4/24/2024 <9 µg/L 9 µg/L Not Detected
PFDA 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 4/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 4/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 4/24/2024 0.0079 µg/L 0.003 µg/L Detected
PFMBA 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 4/24/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFHpS 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 4/24/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 4/24/2024 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 4/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 4/24/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFOA 4/24/2024 0.0200 µg/L 0.004 µg/L Detected
PFUnA 4/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFPeS 4/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 4/24/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFUnA 4/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 4/24/2024 0.0063 µg/L 0.003 µg/L Detected
PFDA 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 4/24/2024 0.0190 µg/L 0.004 µg/L Detected
PFOS 4/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
11Cl-PF3OUdS 4/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
NEtFOSAA 4/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFNA 4/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 4/24/2024 <0.008 µg/L 0.008 µg/L Not Detected
lithium 4/24/2024 <9 µg/L 9 µg/L Not Detected
PFDoA 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 4/24/2024 0.0064 µg/L 0.003 µg/L Detected
PFHxS 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 4/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 4/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 4/24/2024 0.0052 µg/L 0.003 µg/L Detected
9Cl-PF3ONS 4/24/2024 <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.