Knapp Waterworks
EPA ID: WI6170267 · 486 people served · 1 ZIP code
In the current EPA monitoring period, Knapp Waterworks has 1 violation still listed as unresolved, with the utility supplying water to approximately 486 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Knapp Waterworks Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Knapp Waterworks serves a community with a median household income of $68,750 and an estimated 1,446 residents across its service area. Approximately 58% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Knapp Waterworks's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Dunn County, Wisconsin rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Knapp Waterworks compares to EPA limits
What This Means For You
Consumer Confidence Report Rule at 3 mg/L exceeds the EPA maximum of mg/L.
Total Coliform at 1 presence exceeds the EPA maximum of presence.
Chlorine residual was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Wisconsin
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Knapp Waterworks (EPA ID: WI6170267) is a community water system in Wisconsin that serves approximately 486 people from groundwater sources.
This system serves ZIP code 54749 in Knapp.
Average Home Safety Score: B (75/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| September 2, 2025 | Chlorine residual | Health-based | Unresolved |
| April 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| August 1, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
| February 1, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting Failure | 3 | No |
| Total Coliform | Microbiological | 1 | No |
| Chlorine residual | Disinfectant | 1 | Yes |
Health Risk Details
Chlorine (Residual Disinfectant) (EPA limit: 4 mg/L (MRDL — Maximum Residual Disinfectant Level))
Irritation & DBP formation at high levels; protective at normal treatment levels At-risk groups: people with asthma or chemical sensitivities, kidney dialysis patients (water must be dechlorinated).
Removal methods: granular activated carbon (GAC), KDF media filter, carbon block filter. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 54749 | 0.006 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 54749 — Knapp
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Knapp Waterworks (WI6170267) on EPA.gov.
Frequently Asked Questions
Is Knapp Waterworks water safe to drink?
Knapp Waterworks has recorded 1 health-based violation in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Knapp Waterworks serve?
Knapp Waterworks serves approximately 486 people across 1 ZIP code in Wisconsin.
Where does Knapp Waterworks get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Knapp Waterworks (EPA ID: WI6170267) — request the latest Consumer Confidence Report or ask about specific contaminants.