Fond Du Lac, WI: 6 Health Violations — 46/100 (2026)
3 ZIP codes · 6 water systems · Updated 2026-06-03
Within Fond Du Lac, water quality data indicates below-average safety by WI standards — independent testing is a reasonable precaution for residents whose systems show active violations.
How Fond Du Lac Compares
Data: EPA SDWIS Last verified: 2026-06-03
Fond Du Lac Water: The Quick Version
- Your city's water systems recorded 39 violations in the past 5 years.
- Average lead level: 0.0095 mg/L.
- Homes built before 1986: 62% — older plumbing may contain lead solder.
- Estimated remediation: $2,300 per household.
- CDC health risk index: 13.66 — above typical levels.
Water Systems Serving Fond Du Lac
Federal drinking water records identify 6 systems in Fond Du Lac, WI. The leading 3 providers serve the largest share of residential connections, each operating as a separate entity with its own rate authority, infrastructure management, and EPA compliance obligations — so service conditions are not uniform city-wide.
Overview
We track water quality and home safety data for 3 ZIP codes in Fond Du Lac, Wisconsin, covering 6 community water systems serving approximately 63,351 people.
3 of 3 ZIP codes (100%) have recorded EPA violations. 6 health-based violations documented.
Home Safety Score
Average Home Safety Score for Fond Du Lac: D (46/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Fond Du Lac water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0095 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 3 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 20 | 3 |
| Stage 2 DBP Rule | Treatment Technique | 12 | 3 |
| Lead and Copper Rule | Treatment Technique | 8 | 3 |
| Lead | Inorganic | 4 | 3 |
| Total Coliform | Microbiological | 4 | 3 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 54935 | D | 13 | 2 | Fond Du Lac Waterworks |
| 54936 | D | 13 | 2 | Fond Du Lac Waterworks |
| 54937 | D | 13 | 2 | Fond Du Lac Waterworks |
All ZIP Codes in Fond Du Lac
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Fond Du Lac
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Fond Du Lac
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Fond Du Lac's Housing Stock?
With 62% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Viewed through the lens of construction era, Fond Du Lac is predominantly an older city — a median build year of 1975 puts most of the residential inventory in the range where pre-1986 plumbing materials were the standard.
Over half of homes in Fond Du Lac were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Fond Du Lac: Remediation Cost in Perspective
Setting Fond Du Lac remediation figures against its property market, the resulting ratio sits comfortably in the low tier — a classification that reflects the kind of household financial position where most homeowners can identify documented issues, schedule the work, and absorb the cost without it registering as a significant budget disruption.
Remediation costs in Fond Du Lac are relatively low compared to home values. The $1,483–$3,300 estimated range is a small fraction of median property value. Home values are 13% above the Wisconsin average.
Protecting Children from Lead in Fond Du Lac
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Before the federal solder ban, lead solder was a routine plumbing material, and 62% of the Fond Du Lac inventory was built in that earlier era — a share large enough to move household-level reads onto the standard list.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Fond Du Lac
Multiple flood events have been recorded for Fond Du Lac through the NFIP — 500 claims in total, with 67% of ZIP codes in FEMA-designated zones — pointing to a flood exposure profile that merits inclusion in a water quality assessment without reaching high-severity planning territory.
Fond Du Lac has a moderate flood history with 500 FEMA claims averaging $11,064 per payout. 67% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,300</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Fond Du Lac
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Consumer Confidence Report Rule can reduce the most common contaminant found in Fond Du Lac's water.
- Check your home's plumbing. With 62% of homes built before 1986, lead solder is a real possibility.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Fond Du Lac, WI