States ›Wisconsin ›Waukesha County ›Waukesha

Waukesha, WI Tap Water Quality 2026

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

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

Main Utility: Waukesha Water Utility PWSID: WI2680238 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 0.56 ppb, 4% of the action level and no violations are open. No PFAS was detected.

B

Waukesha earns a B for water quality

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

Lead: 0.56 ppb — 4% of the federal action level
PFAS tested, none detected
212 violations since 2015, 184 health-based
No violations currently open
Waukesha's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 0.56 ppb — 4% of the federal action level
✓ Lower lead than 92% of Wisconsin utilities
Population Served
70921
~26192 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
212 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
4% of EPA action level
0.56 ppb
Action level: 15 ppb
The 90th-percentile lead result is 0.56 ppb, 4% 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
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.6 PCI/L 5 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.79 PCI/L 5 pCi/L 2023 Resolved
Public Notice OTHER — — 2023 Unaddressed
Public Notice OTHER — — 2023 Unaddressed
Public Notice OTHER — — 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.6 PCI/L 5 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.79 PCI/L 5 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.79 PCI/L 5 pCi/L 2023 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.95 PCI/L 15 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.41 PCI/L 5 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.18 PCI/L 5 pCi/L 2023 Resolved
Public Notice OTHER — — 2023 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.13 PCI/L 15 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.79 PCI/L 5 pCi/L 2023 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.95 PCI/L 15 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.19 PCI/L 5 pCi/L 2023 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.96 PCI/L 5 pCi/L 2023 Resolved
Public Notice OTHER — — 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.71 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.5 PCI/L 15 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.1 PCI/L 5 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.73 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.03 PCI/L 15 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.85 PCI/L 15 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.1 PCI/L 5 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.73 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.13 PCI/L 15 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.71 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.73 PCI/L 15 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.85 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.88 PCI/L 15 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.56 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.85 PCI/L 15 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.32 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.33 PCI/L 15 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.5 PCI/L 5 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.17 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.28 PCI/L 15 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.03 PCI/L 15 pCi/L 2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.45 PCI/L 5 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.93 PCI/L 15 pCi/L 2022 Resolved
Public Notice OTHER — — 2021 Resolved
Public Notice OTHER — — 2021 Resolved
Public Notice OTHER — — 2021 Resolved
Public Notice OTHER — — 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.14 PCI/L 5 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.83 PCI/L 5 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.85 PCI/L 5 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.5 PCI/L 15 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.48 PCI/L 15 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.78 PCI/L 15 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.84 PCI/L 5 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.95 PCI/L 15 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.14 PCI/L 5 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.85 PCI/L 5 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.05 PCI/L 15 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.45 PCI/L 15 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.84 PCI/L 5 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.24 PCI/L 5 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.35 PCI/L 5 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.5 PCI/L 15 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.9 PCI/L 15 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.78 PCI/L 15 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.8 PCI/L 5 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.48 PCI/L 15 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.15 PCI/L 5 pCi/L 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.1 PCI/L 5 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 23.03 PCI/L 15 pCi/L 2021 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.65 PCI/L 15 pCi/L 2021 Resolved
Public Notice OTHER — — 2020 Resolved
Public Notice OTHER — — 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.8 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.88 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.15 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 23.48 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.1 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.13 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.95 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.7 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.35 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.85 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.87 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.25 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.195 PCI/L 5 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.86 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.38 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.55 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.9 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.41 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.2 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.21 PCI/L 5 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 11.04 PCI/L 5 pCi/L 2020 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.68 PCI/L 15 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.77 PCI/L 5 pCi/L 2019 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.6 PCI/L 15 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.22 PCI/L 5 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.56 PCI/L 5 pCi/L 2019 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 17.08 PCI/L 15 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.64 PCI/L 5 pCi/L 2019 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.7 PCI/L 15 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.66 PCI/L 5 pCi/L 2019 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.55 PCI/L 15 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.9 PCI/L 5 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.02 PCI/L 5 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.09 PCI/L 5 pCi/L 2019 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.4 PCI/L 15 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.85 PCI/L 5 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.06 PCI/L 5 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.42 PCI/L 5 pCi/L 2019 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 19.63 PCI/L 15 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.46 PCI/L 5 pCi/L 2019 Resolved
Public Notice OTHER — — 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.2 PCI/L 5 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.39 PCI/L 5 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.83 PCI/L 15 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.25 PCI/L 5 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.45 PCI/L 15 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.05 PCI/L 5 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.28 PCI/L 15 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.2 PCI/L 5 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.39 PCI/L 5 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.83 PCI/L 15 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.95 PCI/L 5 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.94 PCI/L 5 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.38 PCI/L 15 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.68 PCI/L 5 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.95 PCI/L 5 pCi/L 2018 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.28 PCI/L 15 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.95 PCI/L 5 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.72 PCI/L 5 pCi/L 2018 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.15 PCI/L 5 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.15 PCI/L 15 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.97 PCI/L 5 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.67 PCI/L 5 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.81 PCI/L 5 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.04 PCI/L 15 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 11.3 PCI/L 5 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.67 PCI/L 5 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.05 PCI/L 15 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.81 PCI/L 5 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.04 PCI/L 15 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 11.3 PCI/L 5 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 25.08 PCI/L 15 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.07 PCI/L 5 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.75 PCI/L 5 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.51 PCI/L 5 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.04 PCI/L 15 pCi/L 2017 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.28 PCI/L 5 pCi/L 2017 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.85 PCI/L 15 pCi/L 2017 Resolved
Public Notice OTHER — — 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.8 PCI/L 15 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.05 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 11.09 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.18 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.75 PCI/L 5 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.51 PCI/L 5 pCi/L 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Public Notice OTHER — — 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.87 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 23.48 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.85 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.8 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.14 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.05 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.23 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22.15 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.26 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.35 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.8 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.52 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.12 PCI/L 5 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.76 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.95 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.91 PCI/L 5 pCi/L 2016 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.95 PCI/L 15 pCi/L 2016 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.3 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 24.3 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.27 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.83 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.1 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 16.35 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.3 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 24.3 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.27 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 18.83 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.3 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.95 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.3 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.95 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.02 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.43 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.37 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 24.6 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.1 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 28.73 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.31 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 27.78 PCI/L 15 pCi/L 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.06 PCI/L 5 pCi/L 2015 Resolved
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.58 PCI/L 15 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

212 violations are on record since 2015, of which 184 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Waukesha Water Utility
PWSID WI2680238
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 70,921
Service connections 26,192
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Waukesha tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 0.56 ppb, 4% of the action level.
Does Waukesha water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Waukesha? ▼
Waukesha Water Utility (PWSID WI2680238), one of 3 systems serving this area. Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2024-10-02. No significant deficiencies were recorded.

What Should Waukesha 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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