Fond du Lac County, Wisconsin
18 ZIP codes · Avg score 53/100 · Grade D · Updated 2026-06-04
Compared to state averages, Fond du Lac County scores below the baseline — health violations appear more frequently than the norm across its 18 ZIP codes.
How Fond du Lac County Compares
How Fond du Lac County Compares
Fond du Lac County scores 13 points below the Wisconsin state average (66/100) and 15 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Fond du Lac County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.6 (asthma 11%, diabetes 11.5%)
Estimated additional annual cost per homeowner: $972, driven primarily by energy_code_gap
Infrastructure: 0.399% avg pipe failure probability, 39% of ZIPs at high risk
68.6% of homes built before 1978 (lead paint era)
Violation History (2023–2025)
→ Stable trendEPA violation counts by year across Fond du Lac County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 14 violations. Past 5 years: 16 total (16 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: $972
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
50,282 housing units in Fond du Lac 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 Fond du Lac County
Remediation costs are relatively manageable for most homeowners in Fond du Lac 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 Fond du Lac 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 Fond du Lac County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | FOND DU LAC WATERWORKS | 44,303 | 39 |
| 2 | Ashwood Grove Edgewater | 1,046 | 39 |
| 3 | Fond Du Lac Tn Water Utility | 980 | 39 |
| 4 | Woodland Park | 66 | 39 |
| 5 | Mary Hill Park Sanitary District | 65 | 39 |
22 total water systems serve Fond du Lac County.
All ZIP Codes in Fond du Lac County
18 ZIP codes tracked in Fond du Lac County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 53011 | Cascade | 70 | B | 0 | $244K |
| 2 | 53065 | Oakfield | 70 | B | 0 | $247K |
| 3 | 53019 | Eden | 66 | C | 0 | $227K |
| 4 | 53057 | Mount Calvary | 66 | C | 0 | $230K |
| 5 | 53010 | Campbellsport | 65 | C | 10 | $276K |
| 6 | 53931 | Fairwater | 65 | C | 2 | $130K |
| 7 | 53963 | Waupun | 61 | C | 7 (1 health) | $183K |
| 8 | 53919 | Brandon | 60 | C | 0 | $211K |
| 9 | 53049 | Malone | 53 | D | 0 | $271K |
| 10 | 54936 | Fond Du Lac | 49 | D | 13 (2 health) | — |
| 11 | 54937 | Fond Du Lac | 47 | D | 13 (2 health) | $262K |
| 12 | 54971 | Ripon | 44 | D | 2 (1 health) | $183K |
| 13 | 54935 | Fond Du Lac | 42 | D | 13 (2 health) | $166K |
| 14 | 53079 | Saint Cloud | 40 | D | 0 | $243K |
| 15 | 54932 | Eldorado | 40 | D | 0 | $256K |
| 16 | 54964 | Pickett | 40 | D | 0 | $233K |
| 17 | 54974 | Rosendale | 40 | D | 0 | $250K |
| 18 | 54979 | Van Dyne | 40 | D | 0 | $262K |
Recommended Buyer Guides for Fond du Lac County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 68.6% 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 Fond du Lac County, Wisconsin
Overview
Fond du Lac County in Wisconsin covers 18 ZIP codes with an average Home Safety Score of D (53/100).
7 of 18 ZIP codes have recorded EPA violations. 8 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.
What You Can Do
Fond du Lac County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
68.6% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.