Monroe County, Wisconsin
10 ZIP codes · Avg score 83/100 · Grade B · Updated
ZipCheckup grade for Monroe County: B.
This ZIP looks solid, with a few items worth a quick check.
Across all 10 ZIP codes in Monroe County, tap water consistently meets or exceeds federal safety standards.
How Monroe County Compares
How Monroe County Compares
Monroe County scores 13 points above the Wisconsin state average (70/100) and 10 points above 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: Monroe County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.6 (asthma 11.2%, diabetes 12.8%)
Estimated additional annual cost per homeowner: $961, driven primarily by flood
56.9% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Monroe County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 1 violation. Past 5 years: 2 total (2 health-based).
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: $961
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
19,739 housing units in Monroe 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 Monroe County
Remediation costs are relatively manageable for most homeowners in Monroe 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 Monroe County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Monroe County
3 community water systems serving Monroe County.
- B
- B
Systems with the most violations in Monroe County
2 water systems with recorded EPA violations.
- B
All ZIP Codes in Monroe County
10 ZIP codes tracked in Monroe County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 54656 | Sparta | 83 | B | 0 | $201K |
| 2 | 54660 | Tomah | 83 | B | 1 (1 health) | $188K |
| 3 | 54619 | Cashton | — | — | 4 (1 health) | $217K |
| 4 | 54620 | Cataract | — | — | — | |
| 5 | 54638 | Kendall | — | — | $259K | |
| 6 | 54648 | Norwalk | — | — | $173K | |
| 7 | 54649 | Oakdale | — | — | — | |
| 8 | 54662 | Tunnel City | — | — | — | |
| 9 | 54666 | Warrens | — | — | $193K | |
| 10 | 54670 | Wilton | — | — | $217K |
Recommended Buyer Guides for Monroe County
Strictly editorial - no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Lead Paint Test Kits — 56.9% of homes built before 1978
- 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 Monroe County, Wisconsin
Overview
Monroe County in Wisconsin covers 10 tracked ZIP records with an average Home Safety Score of B (83/100) across 2 scored records.
2 of 3 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 2 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.