Vernon County, Wisconsin
11 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-06-03
Water systems across Vernon County's 11 ZIP codes produce average compliance results overall — pockets with documented violations exist, and the variation between areas makes ZIP-level lookup the most useful tool for residents here.
How Vernon County Compares
How Vernon County Compares
Vernon 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: Vernon County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.4 (asthma 11%, diabetes 12.9%)
Estimated additional annual cost per homeowner: $1,209, driven primarily by flood
Infrastructure: 0.396% avg pipe failure probability, 45% of ZIPs at high risk
61.4% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Vernon County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 7 violations. Past 5 years: 13 total (13 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: $1,209
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
13,956 housing units in Vernon 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 Vernon County
Remediation costs are relatively manageable for most homeowners in Vernon 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 Vernon 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 Vernon County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | GENOA WATERWORKS | 264 | 35 |
| 2 | Edgewood Mobile Home Park | 180 | 35 |
| 3 | Westby Waterworks | 2,400 | 11 |
| 4 | Blue Spruce Mobile Home Community | 80 | 10 |
| 5 | Duncan Prairie Mhc | 64 | 10 |
16 total water systems serve Vernon County.
All ZIP Codes in Vernon County
11 ZIP codes tracked in Vernon County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 54665 | Viroqua | 70 | B | 1 | $223K |
| 2 | 54623 | Coon Valley | 69 | C | 2 (1 health) | $249K |
| 3 | 54651 | Ontario | 69 | C | 3 (1 health) | $198K |
| 4 | 54621 | Chaseburg | 65 | C | 0 | $255K |
| 5 | 54639 | La Farge | 65 | C | 0 | $181K |
| 6 | 54664 | Viola | 63 | C | 4 | $178K |
| 7 | 54667 | Westby | 63 | C | 10 (2 health) | $210K |
| 8 | 54634 | Hillsboro | 62 | C | 4 (2 health) | $181K |
| 9 | 54652 | Readstown | 60 | C | 6 (2 health) | $143K |
| 10 | 54632 | Genoa | 54 | D | 35 (3 health) | $206K |
| 11 | 54624 | De Soto | 45 | D | 0 | $184K |
Recommended Buyer Guides for Vernon County
Filtered against federal data, fitted to local risks.
- Best Lead Paint Test Kits — 61.4% 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 Vernon County, Wisconsin
Overview
Vernon County in Wisconsin covers 11 ZIP codes with an average Home Safety Score of C (62/100).
8 of 11 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.