Marquette County, Wisconsin
4 ZIP codes · Avg score 71/100 · Grade B · Updated 2026-06-04
Compared to state averages, Marquette County scores well — its 4 ZIP codes sit above the baseline for tap water quality.
How Marquette County Compares
How Marquette County Compares
Marquette County scores 5 points above the Wisconsin state average (66/100) and 3 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
Key Risk Factors
Health risk index: 15.7 (asthma 11%, diabetes 14.6%)
Estimated additional annual cost per homeowner: $1,000, driven primarily by flood
Infrastructure: 0.373% avg pipe failure probability
60.5% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Marquette County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 3 violations. Past 5 years: 6 total (6 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: $1,000
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
6,896 housing units in Marquette 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 Marquette County
Remediation costs are relatively manageable for most homeowners in Marquette 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 Marquette County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 4 systems in Marquette County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | MONTELLO WATERWORKS | 1,329 | 5 |
| 2 | Fox Marquette Mobile Home Park | 72 | 5 |
| 3 | Lily Meadows Assisted Living | 50 | 0 |
| 4 | Meadowbrook Mobile Home Park | 39 | 0 |
All ZIP Codes in Marquette County
4 ZIP codes tracked in Marquette County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 53964 | Westfield | 83 | B | 0 | $213K |
| 2 | 53949 | Montello | 76 | B | 5 (2 health) | $202K |
| 3 | 53930 | Endeavor | 63 | C | 0 | $210K |
| 4 | 53953 | Packwaukee | 63 | C | 0 | $120K |
Recommended Buyer Guides for Marquette County
Filtered against federal data, fitted to local risks.
- Best Lead Paint Test Kits — 60.5% 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
Overview
Marquette County in Wisconsin covers 4 ZIP codes with an average Home Safety Score of B (71/100).
1 of 4 ZIP codes have recorded EPA violations. 2 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.