ZipCheckup grade for 54113: B.

This ZIP has a few items worth a quick check.

Health Violations Found
B 80

Combined Locks, WI (54113): 1 Health-Based Violation Recorded for Mapped Water Systems - 80/100

EPA data combined for 3 water systems mapped to this ZIP (largest mapped system: Combined Locks Waterworks)

Health Violations Found

Health-based violation records by water system:

EPA records for the water systems mapped to 54113 in Combined Locks, 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 80/100
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.
  • Radon EPA Zone 2 - county-level radon potential, not a home measurement.
Contaminant Summary
Health Violations
6 violations 1 health-based
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: 80 / 100
Home Safety Score higher than 60% of ZIP codes nationwide
3
Water Systems
3,609
People Served
1
Health Violations (since 2021)Median is 0
Groundwater
Water Source
Zone 2
County Radon Potential · Moderate
$236K
Median Home Value10% above state median ($214K)

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Score Breakdown

Overall Home Safety Score: 80/100

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
80/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
50/100
Observed
Annual EPA AirData AQI
100/100
Observed

Required domains

Drinking water
90/100
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 (6) CRITICAL

Your Water System

ZIP code 54113 in Combined Locks, Wisconsin is mapped to the water system Combined Locks Waterworks (EPA ID: WI4450409). This system provides water to approximately 3,609 people from groundwater sources.

There are 3 community water systems serving this area.

Water Systems Serving This Area

System Name EPA ID Population Source
Combined Locks Waterworks WI4450409 3,609 Groundwater
Darboy Sanitary District 1 WI4450117 13,024 Groundwater
Kaukauna Utilities WI4450336 17,493 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 Combined Locks Waterworks (WI4450409) 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 →

UCMR 5 PFAS monitoring: no reportable detections in available records

Available federal UCMR5 records for water systems mapped to ZIP code 54113 show no PFAS detections among the compounds tested, at the program's reporting levels.

The EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5) required community and non-transient non-community water systems serving 3,300 or more people to test for 29 PFAS compounds and lithium between 2023 and 2025. Systems with no detections at the federal minimum reporting level had no results at or above that reporting level.

📊 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 54113 safe to drink?

EPA SDWIS records 6 violations since 2021 across the water systems mapped to ZIP 54113 (primary system: Combined Locks 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 54113's water come from?

The recorded water source for Combined Locks Waterworks, a system mapped to ZIP code 54113, is Groundwater. This system serves approximately 3,609 people.

How does Combined Locks water compare to the national average?

Combined Locks's Home Safety Score ranks better than 60% of U.S. ZIP codes, and at or above 60% within Wisconsin.

How can I get my water tested in Combined Locks?

If Combined Locks 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 54113?

54113 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Outagamie 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). Combined Locks, WI (54113): 1 Health-Based Violation Recorded for Mapped Water Systems - 80/100. https://zipcheckup.com/report/54113/
BibTeX 
@misc{zipcheckup-report-54113,
  author = {{ZipCheckup}},
  title  = {{Combined Locks, WI (54113): 1 Health-Based Violation Recorded for Mapped Water Systems - 80/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/54113/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 54113

ZIP Code City, State Distance Grade Violations
54140 Little Chute, WI 1.2 mi B 2
54136 Kimberly, WI 1.3 mi B 3
54915 Appleton, WI 2.7 mi N/A 17
54130 Kaukauna, WI 2.9 mi B 20
54911 Appleton, WI 4.2 mi B 7
54914 Appleton, WI 5.9 mi B 7
54952 Menasha, WI 6.4 mi N/A 10
54169 Sherwood, WI 6.5 mi N/A 6
54180 Wrightstown, WI 8.0 mi N/A 1
54913 Appleton, WI 8.1 mi B 10

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Coverage: 13/17 risk factors Data sources →
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