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City water profile

Water hardness in Waukesha

Find official utility reports, understand hardness, and check the water system serving your home in Waukesha, Wisconsin.

Utility-reported hardness

Not yet available

Check your provider and source →
State comparison
Unavailable
Evidence comparison rank
—
Matched utilities
2
Active health records
0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →
Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

Waukesha Water Utility

WI2680238 · Surface water · 70,718 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →
Measurements (3)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level
Reported level
5.6e-4 mg/L
Action level
0.015 mg/L

4% of the listed benchmark

Monitoring period: Jul 1, 2024 to Dec 31, 2024

Combined Radium (-226 and -228)

EPA SDWIS reported health-based violation

Reported violation
Reported level
5.6 PCI/L
Maximum contaminant level
5 PCI/L

112% of the listed benchmark

Monitoring period: Oct 1, 2023 to Oct 15, 2023

Gross Alpha, Excl. Radon and U

EPA SDWIS reported health-based violation

Reported violation
Reported level
16.95 PCI/L
Maximum contaminant level
15 PCI/L

113% of the listed benchmark

Monitoring period: Apr 1, 2023 to Jun 30, 2023

Violation history (75)
Imported violation history for Waukesha Water Utility
RuleStatusPeriod
Combined Radium (-226 and -228)Health-basedResolvedOct 1, 2023 to Oct 15, 2023
Combined Radium (-226 and -228)Health-basedResolvedOct 1, 2023 to Oct 15, 2023
Public NoticeUnaddressedSep 29, 2023
Public NoticeUnaddressedSep 29, 2023
Public NoticeResolvedSep 20, 2023 to Jan 24, 2024
Combined Radium (-226 and -228)Health-basedResolvedJul 1, 2023 to Sep 30, 2023
Combined Radium (-226 and -228)Health-basedResolvedJul 1, 2023 to Sep 30, 2023
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2023 to Jun 30, 2023
Gross Alpha, Excl. Radon and UHealth-basedResolvedApr 1, 2023 to Jun 30, 2023
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2023 to Jun 30, 2023
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2023 to Jun 30, 2023
Public NoticeResolvedMar 6, 2023 to Jun 29, 2023
Gross Alpha, Excl. Radon and UHealth-basedResolvedJan 1, 2023 to Mar 31, 2023
Gross Alpha, Excl. Radon and UHealth-basedResolvedJan 1, 2023 to Mar 31, 2023
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2023 to Mar 31, 2023
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2023 to Mar 31, 2023
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2023 to Mar 31, 2023
Public NoticeResolvedDec 9, 2022 to Mar 1, 2023
Public NoticeResolvedDec 9, 2022 to Mar 1, 2023
Public NoticeResolvedNov 21, 2022 to Mar 1, 2023
Public NoticeResolvedNov 21, 2022 to Mar 1, 2023
Public NoticeResolvedNov 21, 2022 to Mar 1, 2023
Public NoticeResolvedNov 21, 2022 to Mar 1, 2023
Public NoticeResolvedNov 21, 2022 to Mar 1, 2023
Combined Radium (-226 and -228)Health-basedResolvedOct 1, 2022 to Dec 31, 2022
Combined Radium (-226 and -228)Health-basedResolvedOct 1, 2022 to Dec 31, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedOct 1, 2022 to Dec 31, 2022
Combined Radium (-226 and -228)Health-basedResolvedOct 1, 2022 to Dec 31, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedOct 1, 2022 to Dec 31, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedJul 1, 2022 to Sep 30, 2022
Combined Radium (-226 and -228)Health-basedResolvedJul 1, 2022 to Sep 30, 2022
Combined Radium (-226 and -228)Health-basedResolvedJul 1, 2022 to Sep 30, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedJul 1, 2022 to Sep 30, 2022
Combined Radium (-226 and -228)Health-basedResolvedJul 1, 2022 to Sep 30, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedJul 1, 2022 to Sep 30, 2022
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2022 to Jun 30, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedApr 1, 2022 to Jun 30, 2022
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2022 to Jun 30, 2022
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2022 to Jun 30, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedApr 1, 2022 to Jun 30, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedApr 1, 2022 to Jun 30, 2022
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2022 to Mar 31, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedJan 1, 2022 to Mar 31, 2022
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2022 to Mar 31, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedJan 1, 2022 to Mar 31, 2022
Gross Alpha, Excl. Radon and UHealth-basedResolvedJan 1, 2022 to Mar 31, 2022
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2022 to Mar 31, 2022
Public NoticeResolvedDec 21, 2021 to Mar 7, 2022
Public NoticeResolvedDec 21, 2021 to Mar 7, 2022
Public NoticeResolvedDec 21, 2021 to Mar 7, 2022
Public NoticeResolvedDec 21, 2021 to Mar 7, 2022
Combined Radium (-226 and -228)Health-basedResolvedOct 1, 2021 to Dec 31, 2021
Combined Radium (-226 and -228)Health-basedResolvedOct 1, 2021 to Dec 31, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedOct 1, 2021 to Dec 31, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedOct 1, 2021 to Dec 31, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedOct 1, 2021 to Dec 31, 2021
Combined Radium (-226 and -228)Health-basedResolvedOct 1, 2021 to Dec 31, 2021
Combined Radium (-226 and -228)Health-basedResolvedJul 1, 2021 to Sep 30, 2021
Combined Radium (-226 and -228)Health-basedResolvedJul 1, 2021 to Sep 30, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedJul 1, 2021 to Sep 30, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedJul 1, 2021 to Sep 30, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedJul 1, 2021 to Sep 30, 2021
Combined Radium (-226 and -228)Health-basedResolvedJul 1, 2021 to Sep 30, 2021
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2021 to Jun 30, 2021
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2021 to Jun 30, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedApr 1, 2021 to Jun 30, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedApr 1, 2021 to Jun 30, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedApr 1, 2021 to Jun 30, 2021
Combined Radium (-226 and -228)Health-basedResolvedApr 1, 2021 to Jun 30, 2021
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2021 to Mar 31, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedJan 1, 2021 to Mar 31, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedJan 1, 2021 to Mar 31, 2021
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2021 to Mar 31, 2021
Combined Radium (-226 and -228)Health-basedResolvedJan 1, 2021 to Mar 31, 2021
Gross Alpha, Excl. Radon and UHealth-basedResolvedJan 1, 2021 to Mar 31, 2021

Schoenstatt Sisters Of Mary

WI2680242 · Groundwater · 80 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →
Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level
Reported level
0.0013 mg/L
Action level
0.015 mg/L

9% of the listed benchmark

Monitoring period: Jun 1, 2024 to Sep 30, 2024

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

City summary

What the indexed records say

Waukesha has 3 published ZIP profiles across Waukesha County. The regional-evidence median is 254 PPM. The city does not meet the stricter comparison standard.

The 254–261 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard3 ZIPs

3 of 3 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
9.6 miles
Profiles with evidence
3/3

Confidence labels

High: 2Moderate: 1Low: 0

Observation window: Apr 12, 2017 to Apr 24, 2025.

ZIP directory

Water reports in Waukesha

Open a ZIP for site-level provenance and measurements.

ZIP code

53186

Very Hard

254 PPM

Nearest site
13 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

53188

Very Hard

254 PPM

Nearest site
9.6 mi
Confidence
High

View full ZIP evidence →

ZIP code

53189

Very Hard

261 PPM

Nearest site
9.1 mi
Confidence
High

View full ZIP evidence →

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Waukesha

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.