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Sauk City, WI Tap Water Quality 2026

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

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

Main Utility: Sauk City Waterworks PWSID: WI1570105 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 6.40 ppb, 43% of the action level and no violations are open. No PFAS was detected.

A

Sauk City earns an A for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 6.40 ppb — 43% of the federal action level
PFAS tested, none detected
2 violations since 2015, 0 health-based
No violations currently open
Sauk City's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 6.40 ppb — 43% of the federal action level
✓ Lower lead than 12% of Wisconsin utilities
Population Served
3484
~1545 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
2 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
43% of EPA action level
6.40 ppb
Action level: 15 ppb
The 90th-percentile lead result is 6.40 ppb, 43% 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
Consumer Confidence Rule OTHER — — 2024 Resolved
Consumer Confidence Rule OTHER — — 2024 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

2 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 Sauk City Waterworks
PWSID WI1570105
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 3,484
Service connections 1,545
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Sauk City tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 6.40 ppb, 43% of the action level.
Does Sauk City water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Sauk City? ▼
Sauk City Waterworks (PWSID WI1570105). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2026-03-17. No significant deficiencies were recorded.

What Should Sauk City 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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