Waukesha County, Wisconsin
32 ZIP codes · Avg score 52/100 · Grade D · Updated
ZipCheckup grade for Waukesha County: D.
Several federal signals point to home-safety risks in this ZIP.
Covering 32 ZIP codes, Waukesha County falls in the bottom tier for tap water safety - health-based violations are a recurring pattern, and the county's grade signals that residents should check system-level detail for their specific address.
How Waukesha County Compares
How Waukesha County Compares
Waukesha County scores 18 points below the Wisconsin state average (70/100) and 21 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: Waukesha County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.8 (asthma 10.2%, diabetes 10.5%)
Estimated additional annual cost per homeowner: $1,175, driven primarily by flood
59.5% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Waukesha County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 48 violations. Past 5 years: 157 total (157 health-based). Health-based violations are rising versus the prior 2-year window - worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,175
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
176,283 housing units in Waukesha County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Waukesha County
Remediation costs are relatively manageable for most homeowners in Waukesha County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Waukesha County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Waukesha County
8 community water systems serving Waukesha County.
- D
- F
- D
- C
- C
- C
Show all 8 water systems
- D
- D
39 total water systems serve Waukesha County.
Systems with the most violations in Waukesha County
5 water systems with recorded EPA violations.
- D
- F
- F
- F
All ZIP Codes in Waukesha County
32 ZIP codes tracked in Waukesha County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 53122 | Elm Grove | 65 | C | 6 (1 health) | $470K |
| 2 | 53149 | Mukwonago | 65 | C | 4 | $385K |
| 3 | 53005 | Brookfield | 64 | C | 8 (1 health) | $386K |
| 4 | 53151 | New Berlin | 64 | C | 2 | $351K |
| 5 | 53051 | Menomonee Falls | 62 | C | 10 (2 health) | $342K |
| 6 | 53045 | Brookfield | 61 | C | 22 (11 health) | $444K |
| 7 | 53066 | Oconomowoc | 60 | C | 10 (2 health) | $403K |
| 8 | 53150 | Muskego | 60 | C | 7 (1 health) | $391K |
| 9 | 53089 | Sussex | 50 | D | 42 (22 health) | $387K |
| 10 | 53146 | New Berlin | 50 | D | 76 (60 health) | $319K |
| 11 | 53189 | Waukesha | 50 | D | 79 (60 health) | $373K |
| 12 | 53029 | Hartland | 33 | F | 50 (25 health) | $450K |
| 13 | 53072 | Pewaukee | 33 | F | 142 (95 health) | $424K |
| 14 | 53186 | Waukesha | 33 | F | 97 (71 health) | $278K |
| 15 | 53188 | Waukesha | 33 | F | 133 (94 health) | $317K |
| 16 | 53007 | Butler | — | — | 2 | $216K |
| 17 | 53008 | Brookfield | — | — | — | |
| 18 | 53017 | Colgate | — | — | 6 (1 health) | $477K |
| 19 | 53018 | Delafield | — | — | 26 (6 health) | $485K |
| 20 | 53046 | Lannon | — | — | 0 | $256K |
| 21 | 53052 | Menomonee Falls | — | — | — | |
| 22 | 53056 | Merton | — | — | — | |
| 23 | 53058 | Nashotah | — | — | 23 (4 health) | $506K |
| 24 | 53064 | North Lake | — | — | — | |
| 25 | 53069 | Okauchee | — | — | 2 | $399K |
| 26 | 53103 | Big Bend | — | — | $381K | |
| 27 | 53118 | Dousman | — | — | 3 (1 health) | $367K |
| 28 | 53119 | Eagle | — | — | 4 | $374K |
| 29 | 53127 | Genesee Depot | — | — | 4 | — |
| 30 | 53153 | North Prairie | — | — | 4 | $394K |
| 31 | 53183 | Wales | — | — | 76 (61 health) | $383K |
| 32 | 53187 | Waukesha | — | — | — |
Recommended Buyer Guides for Waukesha County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 59.5% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Waukesha County, Wisconsin
Overview
Waukesha County in Wisconsin covers 32 tracked ZIP records with an average Home Safety Score of D (52/100) across 15 scored records.
25 of 26 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 104 health-based violations appear in the available health breakdown.
← Back to Wisconsin Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
What You Can Do
Waukesha County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
59.5% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.