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Poygan, WI Tap Water Quality 2026

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

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

Main Utility: Winneconne Waterworks PWSID: WI4710354 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 0.93 ppb, 6% of the action level and no violations are open. PFAS has never been sampled at this system.

C

Poygan earns a C for water quality

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

Lead: 0.93 ppb — 6% of the federal action level
PFAS never sampled at this system
16 violations since 2015, 13 health-based
No violations currently open
Poygan's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 0.93 ppb — 6% of the federal action level
✓ Lower lead than 82% of Wisconsin utilities
Population Served
~926 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
16 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
6% of EPA action level
0.93 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
108.5% of EPA action level
1,410 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 0.93 ppb, 6% 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. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.67 PCI/L 15 pCi/L 2024 Resolved
Groundwater Rule OTHER — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.3 PCI/L 15 pCi/L 2024 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 24.62 PCI/L 15 pCi/L 2023 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.392 PCI/L 15 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 18.5667 PCI/L 5 pCi/L 2023 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.9417 PCI/L 15 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.52 PCI/L 15 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.25 PCI/L 15 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.3 PCI/L 15 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.82 PCI/L 15 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.53 PCI/L 15 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.02 PCI/L 15 pCi/L 2017 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

16 violations are on record since 2015, of which 13 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Winneconne Waterworks
PWSID WI4710354
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served
Service connections 926
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Poygan tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 0.93 ppb, 6% of the action level.
Does Poygan 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 Poygan? ▼
Winneconne Waterworks (PWSID WI4710354). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-03-05. Inspectors recorded 1 significant deficiency.

What Should Poygan Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
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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