CheckPFAS

ZIP Code 54403

High Risk
High Risk PFAS Risk Level

PFAS above EPA limits detected

1 compound exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.

7
PFAS Detected
1
Above EPA Limits
2
Water Systems
118%
Highest % of MCL

Compounds Exceeding EPA Limits

PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 118% of limit
Detected: 4.70 ppt
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WAUSAU WATERWORKS

WI7370102 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Wisconsin
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFBA
Perfluorobutanoic acid
5.00pptNo federal limit—Unregulated

SCHOFIELD WATERWORKS

WI7370162 High Risk
Water Type
Groundwater
PFAS Detected
6
Above MCL
1
State
Wisconsin
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOA
Perfluorooctanoic acid
4.70ppt
118% of limit
4 ppt⚠ Exceeds MCL
PFHxS
Perfluorohexane sulfonic acid
6.20ppt
62% of limit
10 pptBelow limit
PFBS
Perfluorobutane sulfonic acid
11.00pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
9.80pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
7.80pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
5.30pptNo federal limit—Unregulated
Note: ZIP code 54403 is served by 2 separate water utilities. Results above show data for each system independently.

Data source: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5) — January 2026 release.

UCMR 5 tested ~10,000 public water systems serving more than 25 people between 2023-2025 for 29 PFAS compounds.

Detection values represent the highest single-sample result measured at entry points to the distribution system.

View raw EPA data →