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Thiensville, WI Tap Water Quality 2026

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

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

Main Utility: Century Estates 1 PWSID: WI2460143 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 0.72 ppb, 5% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Thiensville earns a B for water quality

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

Lead: 0.72 ppb — 5% of the federal action level
PFAS never sampled at this system
1 violations since 2015, 0 health-based
No violations currently open
Thiensville's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 0.72 ppb — 5% of the federal action level
✓ Lower lead than 88% of Wisconsin utilities
Population Served
850
~54 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
1 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
5% of EPA action level
0.72 ppb
Action level: 15 ppb
The 90th-percentile lead result is 0.72 ppb, 5% 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 MONITORING AND REPORTING — TT 2025 Unaddressed
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 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 Century Estates 1
PWSID WI2460143
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 850
Service connections 54
Systems serving this area 15
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Thiensville tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 0.72 ppb, 5% of the action level.
Does Thiensville 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 Thiensville? ▼
Century Estates 1 (PWSID WI2460143), one of 15 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-05-30. No significant deficiencies were recorded.

What Should Thiensville 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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