ZipCheckup grade for 54636: B.

This ZIP has a few items worth a quick check.

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Health Violations Found
B 79

Holmen, WI (54636): PFAS Detected in Mapped Water Systems - 79/100

EPA data combined for 2 water systems mapped to this ZIP (largest mapped system: Onalaska Waterworks)

Health Violations Found PFAS Detected

Health-based violation records by water system:

EPA records for the water systems mapped to 54636 in Holmen, WI contain 6 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 1 are marked health-based.

Data source: U.S. Environmental Protection Agency (EPA) SDWIS

Based on EPA Drinking Water FEMA Flood Data U.S. Census CDC Energy Information Admin. USGS Water Data & 9 more federal sources
Latest air quality, EPA records and weather alerts Current data temporarily unavailable
Current EPA violation data unavailable
Water records and current conditions
Current EPA violation data unavailable
Safety Score
B 79/100
Water Quality Issues 1 health-based violation
Lead Risk Below action level Below the reporting limit, 90th percentile, sample period ending 2023-09-30
NFIP Claim History N/A
Data confidence: High (direct measurement) Medium (sampled / sub-geography) Low (modeled / inferred) Methodology →

At a Glance

  • Water EPA records for water systems mapped to this ZIP show 1 health-based violation and 5 non-health-based (since 2021).
  • Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
  • PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
  • Radon EPA Zone 2 - county-level radon potential, not a home measurement.
Contaminant Summary
Health Violations
6 violations 1 health-based PFAS detected
Report data assembled: Jul 27, 2026 EPA water-system identity: source date or period is not present in ZipCheckup's accepted source record EPA violation history: more than two update cycles old Lead, copper and UCMR measurements: source date or period is not present in ZipCheckup's accepted source record
B
ZIP-level Home Safety model score: 79 / 100
Home Safety Score higher than 59% of ZIP codes nationwide
2
Water Systems
18,000
People Served
1
Health Violations (since 2021)Median is 0
Groundwater
Water Source
Zone 2
County Radon Potential · Moderate
$291K
Median Home Value36% above state median ($214K)

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Score Breakdown

Overall Home Safety Score: 79/100

This is the published model score. Component and domain values are shown independently; they are not added together on this page.

Canonical components

EPA water compliance
74/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
50/100
Observed
Annual EPA AirData AQI
100/100
Observed

Required domains

Drinking water
87/100
Indoor environment
50/100
Outdoor environment
100/100

Coverage: 4 of 4 components and 3 of 3 domains observed.

Model 4.0.0; series home-safety-v4-cross-vertical.

Safety & Health (7) CRITICAL

Your Water System

ZIP code 54636 in Holmen, Wisconsin is mapped to the water system Onalaska Waterworks (EPA ID: WI6320327). This system provides water to approximately 18,000 people from groundwater sources.

There are 2 community water systems serving this area.

Water Systems Serving This Area

System Name EPA ID Population Source
Onalaska Waterworks WI6320327 18,000 Groundwater
Holmen Waterworks WI6320306 10,147 Groundwater

Other Water Quality Reports in Wisconsin

Nearby Water Quality Reports

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Onalaska Waterworks (WI6320327) on EPA.gov.

5 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.

📊 EPA Safe Drinking Water · View source →

PFAS Contamination Detected

PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 54636.

Detected compounds: PFBS, PFPeA.

Highest measured level: 0.0042 µg/L

Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.

📊 EPA UCMR5 · View source →
Environmental Hazards (10) MODERATE
Home & Infrastructure (6) OK
Cost & Community (9) HIGH

CPSC product recall notices

These national notices are not matched to this ZIP code or water system.

View all recalls →

📊 CPSC · View source →

Frequently Asked Questions

Is the tap water in 54636 safe to drink?

EPA SDWIS records 6 violations since 2021 across the water systems mapped to ZIP 54636 (primary system: Onalaska Waterworks), including 1 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.

Where does 54636's water come from?

The recorded water source for Onalaska Waterworks, a system mapped to ZIP code 54636, is Groundwater. This system serves approximately 18,000 people.

How does Holmen water compare to the national average?

Holmen's Home Safety Score ranks better than 59% of U.S. ZIP codes, and at or above 56% within Wisconsin.

How can I get my water tested in Holmen?

If Onalaska Waterworks supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.

What is the radon risk for 54636?

54636 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in La Crosse County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

Are there PFAS (forever chemicals) in 54636's water?

Yes, PFAS have been detected in samples from water systems mapped to 54636. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.

How to cite this page

APA ZipCheckup. (2026). Holmen, WI (54636): PFAS Detected in Mapped Water Systems - 79/100. https://zipcheckup.com/report/54636/
BibTeX 
@misc{zipcheckup-report-54636,
  author = {{ZipCheckup}},
  title  = {{Holmen, WI (54636): PFAS Detected in Mapped Water Systems - 79/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/54636/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 54636

ZIP Code City, State Distance Grade Violations
54650 Onalaska, WI 5.5 mi B 8
54602 La Crosse, WI 6.2 mi N/A 0
55925 Dakota, MN 8.3 mi N/A 0
54603 La Crosse, WI 8.8 mi C 11
54669 West Salem, WI 9.3 mi B 3
54661 Trempealeau, WI 9.4 mi N/A 0
54630 Galesville, WI 9.5 mi N/A 3
54644 Mindoro, WI 9.9 mi N/A 0
55947 La Crescent, MN 10.7 mi N/A 0
54601 La Crosse, WI 12.3 mi C 30

Contaminants Detected in 54636

Learn more about the contaminants found in your water supply:

Overall safety breakdown

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Coverage: 13/17 risk factors Data sources →
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