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City water profile

Middleton water quality

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

Median indexed hardness

365PPM

One indexed ZIP

Range 364.5–364.5 PPM

State comparison
77 PPM above
State hardness rank
#86 of 479
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Middleton has 1 published ZIP profile across Dane County. The indexed median is 365 PPM, compared with 288 PPM across Wisconsin.

Among the 479 Wisconsincities with an indexed median, Middleton ranks #86from 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. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

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
27.1 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Aug 3, 2016 to Aug 20, 2024.

ZIP directory

Water reports in Middleton

Open a ZIP for site-level provenance and measurements.

ZIP code

53562

Very Hard

364.5 PPM

Nearest site
27.1 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Middleton Waterworks

PWSID WI1130242

Groundwater
System population served
23,868
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

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
LEAD AND COPPER RULE REVISIONSWI1130242Oct 17, 2024Resolved · health-based
Public NoticeWI1130242Oct 17, 2024Unaddressed
Public NoticeWI1130242Oct 17, 2024Unaddressed
LEAD AND COPPER RULE REVISIONSWI1130242Oct 17, 2024Resolved
DiquatWI1130242Jan 1, 2023Resolved
GlyphosateWI1130242Jan 1, 2023Resolved
DinosebWI1130242Jan 1, 2023Resolved
Aldicarb sulfoxideWI1130242Jan 1, 2023Resolved
Aldicarb sulfoneWI1130242Jan 1, 2023Resolved
AldicarbWI1130242Jan 1, 2023Resolved

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 Middleton

Is the water hard?

The indexed city median is 365 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.