CheckPFAS

TOMAHAWK WATERWORKS

High Risk
PWSID: WI7350127 Wisconsin Groundwater

1 PFAS compound(s) exceed EPA Maximum Contaminant Levels

This utility has until 2029 to install treatment under the EPA's April 2024 PFAS rule. In the meantime, a point-of-use filter certified NSF/ANSI 58 for PFOA/PFOS provides reliable interim protection.

5
PFAS Detected
1
Above EPA Limits
1
ZIP Served
Groundwater
Water Source

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOA
Perfluorooctanoic acid
21.00ppt
525% of limit
4 ppt⚠ Exceeds MCL
PFPeA
Perfluoropentanoic acid
7.90pptNo federal limitUnregulated
PFBA
Perfluorobutanoic acid
7.80pptNo federal limitUnregulated
PFHxA
Perfluorohexanoic acid
7.50pptNo federal limitUnregulated
PFHpA
Perfluoroheptanoic acid
6.50pptNo federal limitUnregulated

ZIP Codes Served by This Utility

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About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
WI7350127
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor