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Pewaukee, WI Tap Water Quality 2026

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

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

Main Utility: Pewaukee City Water And Sewer Utility PWSID: WI2680214 Updated: 2026 Q2
⚠️

PFAS above the federal limit at 3 of 8 sampling points

Lead is 2.60 ppb, 17% of the action level and no violations are open. However, PFAS exceeds the federal limit at 3 of 8 sampling points, running as high as 3.45 times the limit.

D

Pewaukee earns a D for water quality

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

Lead: 2.60 ppb — 17% of the federal action level
PFAS above the federal limit at 3 of 8 sampling points
74 violations since 2015, 20 health-based
No violations currently open
Pewaukee's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 2.60 ppb — 17% of the federal action level
✓ Lower lead than 42% of Wisconsin utilities
Population Served
7662
~3211 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
74 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
17% of EPA action level
2.60 ppb
Action level: 15 ppb
The 90th-percentile lead result is 2.60 ppb, 17% 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
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.95 PCI/L 15 pCi/L 2026 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.03 PCI/L 15 pCi/L 2025 Archived
Public Notice OTHER — — 2025 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.65 PCI/L 15 pCi/L 2025 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 24.45 PCI/L 15 pCi/L 2025 Archived
Public Notice OTHER — — 2025 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 26.95 PCI/L 15 pCi/L 2025 Archived
Public Notice OTHER — — 2024 Unaddressed
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 24.8 PCI/L 15 pCi/L 2024 Archived
Public Notice OTHER — — 2024 Resolved
Public Notice OTHER — — 2024 Unaddressed
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 23.2 PCI/L 15 pCi/L 2024 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.1 PCI/L 15 pCi/L 2024 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.45 PCI/L 15 pCi/L 2024 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.43 PCI/L 15 pCi/L 2023 Archived
Chromium MONITORING AND REPORTING — 0.1 mg/L 2020 Resolved
Cadmium MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
Barium MONITORING AND REPORTING — 2 mg/L 2020 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2020 Resolved
Fluoride MONITORING AND REPORTING — 4.0 mg/L 2020 Resolved
Mercury MONITORING AND REPORTING — 0.002 mg/L 2020 Resolved
Nickel MONITORING AND REPORTING — — 2020 Resolved
Nitrate-Nitrite MONITORING AND REPORTING — — 2020 Resolved
Nitrite MONITORING AND REPORTING — 1 mg/L 2020 Resolved
Selenium MONITORING AND REPORTING — 0.05 mg/L 2020 Resolved
Beryllium, Total MONITORING AND REPORTING — 0.004 mg/L 2020 Resolved
Thallium, Total MONITORING AND REPORTING — 0.002 mg/L 2020 Resolved
Antimony, Total MONITORING AND REPORTING — 0.006 mg/L 2020 Resolved
Radium-228 MONITORING AND REPORTING — — 2020 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2020 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2020 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2020 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2020 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2020 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2020 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2020 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2020 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2020 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2020 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2020 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2020 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2020 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2020 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2020 Resolved
Public Notice OTHER — — 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.75325 PCI/L 5 pCi/L 2019 Archived
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.61 PCI/L 5 pCi/L 2018 Resolved
Radium-226 MONITORING AND REPORTING — — 2018 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2018 Resolved
Radium-228 MONITORING AND REPORTING — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.2 PCI/L 5 pCi/L 2018 Resolved
Radium-226 MONITORING AND REPORTING — — 2018 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2018 Resolved
Radium-228 MONITORING AND REPORTING — — 2018 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2018 Resolved
Public Notice OTHER — — 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.2 PCI/L 5 pCi/L 2017 Resolved
Public Notice OTHER — — 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.48 PCI/L 5 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.94 PCI/L 5 pCi/L 2017 Resolved
Public Notice OTHER — — 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.57 PCI/L 5 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.55 PCI/L 5 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.55 PCI/L 5 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.66 PCI/L 5 pCi/L 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

74 violations are on record since 2015, of which 20 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Pewaukee City Water And Sewer Utility
PWSID WI2680214
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 7,662
Service connections 3,211
Systems serving this area 6
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Pewaukee tap water safe to drink? ▼
It meets most federal standards, but PFAS exceeds the federal limit at 3 of 8 sampling points. No violations are currently open. Lead is 2.60 ppb, 17% of the action level.
Does Pewaukee water have PFAS? ▼
Yes. PFAS exceeds the federal limit at 3 of 8 sampling points, running as high as 3.45 times the limit. Limits are enforced on a running annual average at each sampling point, not on a single sample.
Who supplies water to Pewaukee? ▼
Pewaukee City Water And Sewer Utility (PWSID WI2680214), one of 6 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-09-26. No significant deficiencies were recorded.

What Should Pewaukee Residents Do?

1
Consider a reverse-osmosis filter
Reverse osmosis removes more than 95% of PFAS. Standard carbon pitchers do not.
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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