Washington County, Wisconsin
10 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-06-03
The systems supplying Washington County's 10 ZIP codes vary in performance — most meet minimum standards, but violations in select areas are on record.
How Washington County Compares
How Washington County Compares
Washington County scores 4 points below the Wisconsin state average (66/100) and 6 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Washington County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.5 (asthma 10.5%, diabetes 10.6%)
Estimated additional annual cost per homeowner: $727, driven primarily by energy_code_gap
Infrastructure: 0.342% avg pipe failure probability, 20% of ZIPs at high risk
52.8% of homes built before 1978 (lead paint era)
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $727
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
54,773 housing units in Washington 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 Washington County
Remediation costs are relatively manageable for most homeowners in Washington 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 Washington County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Washington County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Slinger Water Utility | 5,659 | 10 |
| 2 | West Bend Waterworks | 31,752 | 10 |
| 3 | Saukville Waterworks | 4,268 | 10 |
| 4 | Cedar Lake Home 5 | 330 | 10 |
| 5 | Cedar Lake Home 9 | 206 | 10 |
17 total water systems serve Washington County.
All ZIP Codes in Washington County
10 ZIP codes tracked in Washington County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 53002 | Allenton | 70 | B | 0 | $291K |
| 2 | 53022 | Germantown | 69 | C | 5 (1 health) | $353K |
| 3 | 53037 | Jackson | 69 | C | 3 (1 health) | $312K |
| 4 | 53040 | Kewaskum | 69 | C | 0 | $313K |
| 5 | 53086 | Slinger | 69 | C | 2 (1 health) | $363K |
| 6 | 53076 | Richfield | 66 | C | 0 | $450K |
| 7 | 53027 | Hartford | 65 | C | 0 | $290K |
| 8 | 53090 | West Bend | 51 | D | 5 | $268K |
| 9 | 53095 | West Bend | 51 | D | 5 | $287K |
| 10 | 53078 | Rubicon | 40 | D | 0 | $344K |
Recommended Buyer Guides for Washington County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 52.8% 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
Deep Dive Reports
Detailed analysis for Washington County, Wisconsin
Overview
Washington County in Wisconsin covers 10 ZIP codes with an average Home Safety Score of C (62/100).
5 of 10 ZIP codes have recorded EPA violations. 3 health-based violations have been documented.
← Back to Wisconsin water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.