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Fern, WI Tap Water Quality 2026

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

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

Main Utility: Keyes Lake Mobile Home Park PWSID: WI4190087 Updated: 2026 Q2
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1 violation currently open

Lead is 8.14 ppb, 54% of the action level. PFAS has never been sampled at this system.

F

Fern earns an F for water quality

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

Lead: 8.14 ppb — 54% of the federal action level
PFAS never sampled at this system
15 violations since 2015, 4 health-based
1 violation currently open
Fern's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 8.14 ppb — 54% of the federal action level
✓ Lower lead than 8% of Wisconsin utilities
Population Served
~15 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 15 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
54% of EPA action level
8.14 ppb
Action level: 15 ppb
The 90th-percentile lead result is 8.14 ppb, 54% 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
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2025 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2025 Unaddressed
Public Notice OTHER — — 2025 Unaddressed
Groundwater Rule TREATMENT TECHNIQUE — — 2025 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2025 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Unaddressed
Radium-226 MONITORING AND REPORTING — — 2024 Resolved
Radium-228 MONITORING AND REPORTING — — 2024 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Unaddressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 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

1 violation remains open, out of 15 recorded since 2015 (4 health-based).

About the Main Water System

Utility Keyes Lake Mobile Home Park
PWSID WI4190087
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served
Service connections 15
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Fern tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 8.14 ppb, 54% of the action level.
Does Fern 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 Fern? ▼
Keyes Lake Mobile Home Park (PWSID WI4190087). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-02-24. Inspectors recorded 2 significant deficiencies.

What Should Fern 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
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

Nearby Cities in Wisconsin

Florence, Wi Tap Water Quality 2026 Florence Commonwealth, Wi Tap Water Quality 2026 Florence