Water Quality Report

Custer, WI (54423): 1 Violation Recorded for Mapped Water Systems

EPA data for Stevens Point Waterworks

High County Radon Potential

EPA records for the water systems mapped to 54423 in Custer, WI contain 1 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 0 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 N/A
Water Quality Concerns 1 non-health-based violation record in EPA data
Lead Risk Below action level 0.0024 mg/L, 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 violation (non-health) (since 2021).
  • Lead The reported 90th-percentile lead result of 0.0024 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
  • Radon EPA Zone 1 - highest county-level potential. This is not a home measurement; test before any threshold comparison.
Contaminant Summary
Violations on record (not health-based)
1 violation
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 Consumer Confidence Report: source date or period is not present in ZipCheckup's accepted source record
1
Water System
26,717
People Served
0
Health Violations (since 2021)
Groundwater
Water Source
0.0024 mg/L
Reported Lead Result
Zone 1
County Radon Potential · High
$291K
Median Home Value36% above state median ($214K)

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Score Breakdown

Overall Home Safety Score: Score unavailable

Required evidence is missing. Missing values remain unknown and are not imputed or renormalized.

Canonical components

EPA water compliance
98/100
Observed
PFAS MCL screen
Unknown
Evidence missing
EPA radon zone
0/100
Observed
Annual EPA AirData AQI
Unknown
Evidence missing

Required domains

Drinking water
Unknown
Indoor environment
0/100
Outdoor environment
Unknown

Coverage: 2 of 4 components and 1 of 3 domains observed.

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

Safety & Health (7) HIGH

Your Water System

ZIP code 54423 in Custer, Wisconsin is mapped to the water system Stevens Point Waterworks (EPA ID: WI7500141). This system provides water to approximately 26,717 people from groundwater sources.

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 Stevens Point Waterworks (WI7500141) on EPA.gov.

4 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 →
Environmental Hazards (10) MODERATE
Home & Infrastructure (6) OK
Cost & Community (8) MODERATE

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 54423 safe to drink?

EPA SDWIS records 1 violation since 2021 across the water systems mapped to ZIP 54423 (primary system: Stevens Point Waterworks), including 0 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 54423's water come from?

The recorded water source for Stevens Point Waterworks, a system mapped to ZIP code 54423, is Groundwater. This system serves approximately 26,717 people.

How can I get my water tested in Custer?

If Stevens Point 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.

Is lead a concern in 54423 tap water?

The Lead and Copper Rule record selected for 54423 reports a 90th-percentile lead result of 0.0024 mg/L for a water system mapped to this ZIP (record date 2023-09-30). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.

What is the radon risk for 54423?

54423 is mapped to a county in EPA Radon Zone 1 (high county-level radon potential; EPA recommends testing every home), located in Portage County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

How to cite this page

APA ZipCheckup. (2026). Custer, WI (54423): 1 Violation Recorded for Mapped Water Systems. https://zipcheckup.com/report/54423/
BibTeX 
@misc{zipcheckup-report-54423,
  author = {{ZipCheckup}},
  title  = {{Custer, WI (54423): 1 Violation Recorded for Mapped Water Systems}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/54423/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 54423

ZIP Code City, State Distance Grade Violations
54482 Stevens Point, WI 5.1 mi N/A 1
54492 Stevens Point, WI 6.8 mi N/A 0
54407 Amherst Junction, WI 6.9 mi N/A 0
54458 Nelsonville, WI 7.2 mi N/A 0
54473 Rosholt, WI 7.7 mi N/A 0
54481 Stevens Point, WI 7.7 mi N/A 1
54467 Plover, WI 10.2 mi N/A 1
54406 Amherst, WI 11.3 mi N/A 0
54432 Galloway, WI 12.6 mi N/A 0
54945 Iola, WI 13.9 mi N/A 2

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Coverage: 14/17 risk factors Data sources →
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