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City water profile

Mukwonago water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Mukwonago, Wisconsin.

Median indexed hardness

417PPM

One indexed ZIP

Range 417–417 PPM

State comparison
129 PPM above
State hardness rank
#20 of 479
Matched utilities
3
Active health records
1

City summary

What the indexed records say

Mukwonago has 1 published ZIP profile across Waukesha County. The indexed median is 417 PPM, compared with 288 PPM across Wisconsin.

Among the 479 Wisconsincities with an indexed median, Mukwonago ranks #20from highest to lowest. Across all 556 state ZIP profiles, available estimates run from 41.3to 467 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard1 ZIP

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
7.5 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: May 31, 2017 to Aug 8, 2024.

ZIP directory

Water reports in Mukwonago

Open a ZIP for site-level provenance and measurements.

ZIP code

53149

Very Hard

417 PPM

Nearest site
7.5 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Mukwonago Waterworks

PWSID WI2680209

Groundwater
System population served
8,190
Last reported
May 29, 2026

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

Norris Inc

PWSID WI2680246

Groundwater
System population served
141
Last reported
May 29, 2026

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

Heaven City

PWSID WI2680624

Groundwater
System population served
106
Last reported
May 29, 2026

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

Compliance history

What EPA records show

1 unique active health-based record appears among associated systems. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Public NoticeWI2680246Dec 20, 2025Unaddressed
Groundwater RuleWI2680246Dec 20, 2025Unaddressed · health-based
Di(2-ethylhexyl) phthalateWI2680246Oct 1, 2025Archived
Consumer Confidence RuleWI2680246Jul 1, 2025Unaddressed
Consumer Confidence RuleWI2680246Jul 1, 2025Unaddressed
Lead and Copper RuleWI2680246Jan 1, 2025Unaddressed
Lead and Copper RuleWI2680624Jun 1, 2024Resolved
Lead and Copper RuleWI2680246Jan 1, 2023Resolved
Radium-226WI2680246Oct 1, 2022Resolved
Radium-228WI2680246Oct 1, 2022Resolved

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. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Mukwonago

Is the water hard?

The indexed city median is 417 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

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.