Knapp, WI: 1 Health Violation — 75/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Across Knapp, EPA monitoring data shows low violation rates and healthy safety margins — a pattern that places the city well above WI's average for drinking water compliance across recent reporting cycles.
How Knapp Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Knapp Residents
- Your city's water systems recorded 5 violations in the past 5 years.
- Average lead level: 0.006 mg/L.
- Homes built before 1986: 58% — older plumbing may contain lead solder.
- Estimated remediation: $700 per household.
- CDC health risk index: 12.26 — above typical levels.
Knapp's Water Providers
One utility dominates residential water service in Knapp, WI — out of 1 system in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Knapp, Wisconsin, covering 1 community water system serving approximately 1,446 people.
1 of 1 ZIP code (100%) have recorded EPA violations. 1 health-based violation documented.
Home Safety Score
Average Home Safety Score for Knapp: B (75/100)
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
Knapp water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0060 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
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 | 6 | 1 |
| Total Coliform | Microbiological | 2 | 1 |
| Chlorine residual | Disinfectant | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 54749 | B | 5 | 1 | Knapp Waterworks |
All ZIP Codes in Knapp
- 54749 [B] — 5 violations ⚠
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.
Knapp Community Health Snapshot
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
What's in Knapp's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Knapp Infrastructure Age
With 58% 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
While newer cities carry lower aggregate plumbing risk from lead-era construction, Knapp sits firmly in the older category. The median build year of 1971 indicates that more than half the housing stock was built before 1986, when lead solder was still legally used in residential copper plumbing — and a substantial portion likely predates 1970, when lead pipes were still commonly installed for service lines. These two thresholds together define the elevated plumbing risk environment that older housing cities carry, independent of what the municipal water supply delivers to the meter.
Over half of homes in Knapp 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.
How Remediation Costs Compare in Knapp
In Knapp, property values comfortably outpace what documented remediation typically costs — the equity share is proportionally low.
Remediation costs in Knapp are relatively low compared to home values. The $150–$1,400 estimated range is a small fraction of median property value. Home values are 15% below the Wisconsin average.
Knapp: Lead Risk & Vulnerable Populations
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.
Although utility-side compliance with federal Lead and Copper requirements remains the system reference, that compliance does not extend down into interior plumbing. With 58% of Knapp stock built before the solder ban and aggregate readings at or beyond the action mark, a household-level sample becomes the practical way to close that information gap.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Knapp, WI