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City water profile

Mahaska water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Mahaska, Kansas.

Median indexed hardness

307PPM

One indexed ZIP

Range 307–307 PPM

State comparison
18 PPM above
State hardness rank
#157 of 484
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Mahaska has 1 published ZIP profile across Washington County. The indexed median is 307 PPM, compared with 289 PPM across Kansas.

Among the 484 Kansascities with an indexed median, Mahaska ranks #157from highest to lowest. Across all 541 state ZIP profiles, available estimates run from 72.2to 707 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
23.2 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Oct 27, 2016 to Sep 9, 2025.

ZIP directory

Water reports in Mahaska

Open a ZIP for site-level provenance and measurements.

ZIP code

66955

Very Hard

307 PPM

Nearest site
23.2 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Mahaska, City Of

PWSID KS2020102

Groundwater
System population served
44
Last reported
May 15, 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 REVISIONSKS2020102Jul 2, 2025Unaddressed
ChlorineKS2020102Oct 1, 2024Resolved
Revised Total Coliform RuleKS2020102Oct 1, 2024Resolved
Revised Total Coliform RuleKS2020102May 28, 2024Resolved · health-based
Lead and Copper RuleKS2020102Dec 31, 2020Unaddressed
Lead and Copper RuleKS2020102Dec 30, 2017Unaddressed

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 Mahaska

Is the water hard?

The indexed city median is 307 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.