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Sheldon, WI Tap Water Quality 2026

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

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

Main Utility: Sheldon Water Utility PWSID: WI8550278 Updated: 2026 Q2
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1 violation currently open

Lead is 2.85 ppb, 19% of the action level. PFAS has never been sampled at this system.

F

Sheldon earns an F for water quality

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

Lead: 2.85 ppb — 19% of the federal action level
PFAS never sampled at this system
36 violations since 2015, 7 health-based
1 violation currently open
Sheldon's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 2.85 ppb — 19% of the federal action level
✓ Lower lead than 38% of Wisconsin utilities
Population Served
203
~98 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 36 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
19% of EPA action level
2.85 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.
123.1% of EPA action level
1,600 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 2.85 ppb, 19% 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
Groundwater Rule TREATMENT TECHNIQUE — — 2026 Unaddressed
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Groundwater Rule TREATMENT TECHNIQUE — — 2025 Resolved
Public Notice OTHER — — 2025 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Revised Total Coliform Rule TREATMENT TECHNIQUE — — 2024 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Stage 1 Disinfectants and Disinfection Byproducts Rule TREATMENT TECHNIQUE — — 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2023 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2022 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2021 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2021 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2020 Resolved
Revised Total Coliform Rule TREATMENT TECHNIQUE — — 2017 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2017 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2016 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2016 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 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 36 recorded since 2015 (7 health-based).

About the Main Water System

Utility Sheldon Water Utility
PWSID WI8550278
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 203
Service connections 98
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Sheldon tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 2.85 ppb, 19% of the action level.
Does Sheldon 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 Sheldon? ▼
Sheldon Water Utility (PWSID WI8550278). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-02-07. Inspectors recorded 1 significant deficiency.

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

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