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Fort Winnebago, WI Tap Water Quality 2026

Water quality report for Fort Winnebago, WI — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Fort Winnebago's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Ho-Chunk Che-Nunk PWSID: 055295016 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 5.40 ppb, 36% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Fort Winnebago earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 5.40 ppb — 36% of the federal action level
PFAS never sampled at this system
4 violations since 2015, 0 health-based
No violations currently open
Fort Winnebago's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 5.40 ppb — 36% of the federal action level
✓ Lower lead than 17% of Wisconsin utilities
Population Served
26
~41 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
4 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
36% of EPA action level
5.40 ppb
Action level: 15 ppb
The 90th-percentile lead result is 5.40 ppb, 36% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Revised Total Coliform Rule REPORTING FAILURE — — 2019 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2019 Resolved
Thallium, Total MONITORING AND REPORTING — 0.002 mg/L 2017–2019 Resolved
Nickel MONITORING AND REPORTING — — 2017–2019 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

4 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Ho-Chunk Che-Nunk
PWSID 055295016
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 26
Service connections 41
Systems serving this area 3
Regulator US EPA (tribal primacy)
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Fort Winnebago tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 5.40 ppb, 36% of the action level.
Does Fort Winnebago water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Fort Winnebago? ▼
Ho-Chunk Che-Nunk (PWSID 055295016), one of 3 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-05-14. No significant deficiencies were recorded.

What Should Fort Winnebago Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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