Dunn County, Wisconsin
8 ZIP codes · Avg score 75/100 · Grade B · Updated 2026-06-03
Dunn County — 8 ZIP codes, above-average safety grade.
How Dunn County Compares
How Dunn County Compares
Dunn County scores 9 points above the Wisconsin state average (66/100) and 7 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Dunn County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.3 (asthma 10.8%, diabetes 9.9%)
Estimated additional annual cost per homeowner: $498, driven primarily by energy_code_gap
Infrastructure: 0.359% avg pipe failure probability, 13% of ZIPs at high risk
55.7% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Dunn County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 3 violations. Past 5 years: 4 total (4 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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $498
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
17,505 housing units in Dunn 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 Dunn County
Remediation costs are relatively manageable for most homeowners in Dunn 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 Dunn 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 Dunn County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Colfax Waterworks | 1,102 | 17 |
| 2 | Elk Mound Waterworks | 895 | 6 |
| 3 | Marell Country Estates | 150 | 6 |
| 4 | Country View Mobile Home Court | 54 | 6 |
| 5 | Menomonie Waterworks | 15,950 | 6 |
18 total water systems serve Dunn County.
All ZIP Codes in Dunn County
8 ZIP codes tracked in Dunn County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 54735 | Downsville | 83 | B | 1 | — |
| 2 | 54725 | Boyceville | 82 | B | 2 (1 health) | $205K |
| 3 | 54730 | Colfax | 79 | B | 5 | $229K |
| 4 | 54739 | Elk Mound | 79 | B | 6 | $241K |
| 5 | 54751 | Menomonie | 79 | B | 6 | $233K |
| 6 | 54749 | Knapp | 75 | B | 5 (1 health) | $196K |
| 7 | 54772 | Wheeler | 67 | C | 5 (1 health) | $187K |
| 8 | 54737 | Eau Galle | 53 | D | 0 | $213K |
Recommended Buyer Guides for Dunn County
Methodologically, the recommendation order reflects severity in the federal record: contaminants flagged in EPA detection records for this county outrank generic water concerns, FEMA-confirmed hazard ratings shift emergency-related categories upward, and CDC lead-exposure markers govern when lead-test kits and certified filters appear at the top of the list.
- Best Lead Paint Test Kits — 55.7% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Dunn County, Wisconsin
Overview
Dunn County in Wisconsin covers 8 ZIP codes with an average Home Safety Score of B (75/100).
7 of 8 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.