Walworth County, Wisconsin
15 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-06-03
Water safety in Walworth County is uneven — some of its 15 ZIP codes meet standards cleanly while others carry documented violations.
How Walworth County Compares
How Walworth County Compares
Walworth County scores 11 points below the Wisconsin state average (66/100) and 13 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Walworth County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.8 (asthma 10.5%, diabetes 11.3%)
Estimated additional annual cost per homeowner: $833, driven primarily by energy_code_gap
Infrastructure: 0.426% avg pipe failure probability, 60% of ZIPs at high risk
67.9% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Walworth County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 11 violations. Past 5 years: 27 total (27 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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $833
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
53,834 housing units in Walworth 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 Walworth County
Remediation costs are relatively manageable for most homeowners in Walworth 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 Walworth 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 Walworth County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Bloomfield, Village of | 4,071 | 30 |
| 2 | Williams Bay Waterworks | 2,601 | 27 |
| 3 | Darien Waterworks | 1,573 | 21 |
| 4 | Sharon Waterworks | 1,549 | 21 |
| 5 | Fontana Water Utility | 1,839 | 17 |
29 total water systems serve Walworth County.
All ZIP Codes in Walworth County
15 ZIP codes tracked in Walworth County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 53120 | East Troy | 69 | C | 6 (1 health) | $310K |
| 2 | 53125 | Fontana | 69 | C | 9 (1 health) | $577K |
| 3 | 53585 | Sharon | 65 | C | 16 (1 health) | $207K |
| 4 | 53114 | Darien | 62 | C | 2 | $226K |
| 5 | 53191 | Williams Bay | 61 | C | 7 (1 health) | $369K |
| 6 | 53128 | Genoa City | 56 | C | 4 | $233K |
| 7 | 53147 | Lake Geneva | 56 | C | 2 | $337K |
| 8 | 53157 | Pell Lake | 54 | D | 24 (4 health) | — |
| 9 | 53176 | Springfield | 53 | D | 0 | — |
| 10 | 53115 | Delavan | 52 | D | 3 | $226K |
| 11 | 53190 | Whitewater | 51 | D | 12 | $247K |
| 12 | 53184 | Walworth | 49 | D | 6 | $279K |
| 13 | 53121 | Elkhorn | 41 | D | 6 (3 health) | $288K |
| 14 | 53195 | Zenda | 40 | D | 0 | $174K |
| 15 | 53505 | Avalon | 40 | D | 0 | $258K |
Recommended Buyer Guides for Walworth County
Filtered against federal data, fitted to local risks.
- Best Water Filters for PFAS — PFAS detected in 1 ZIP code
- Best Lead Paint Test Kits — 67.9% 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 Walworth County, Wisconsin
Overview
Walworth County in Wisconsin covers 15 ZIP codes with an average Home Safety Score of C (55/100).
12 of 15 ZIP codes have recorded EPA violations. 11 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.