Is tap water safe in Olathe?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

How hard is the water in Olathe, KS?

Nearby USGS observations produce an estimate of 243 ppm (14.2 grains per gallon), classified as very hard. This is not a tap measurement.

Do I need a water softener in ZIP code 66061?

At 243 ppm, a correctly sized whole-house softener can reduce scale buildup and hard-water spotting. Treatment for hardness does not remove all health-related contaminants.

City water profile

Olathe water quality

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

Median indexed hardness

242PPM

2 indexed ZIPs

Range 241–243 PPM

State comparison: 47 PPM below
State hardness rank: #335 of 484
Matched utilities: 1
Active health records: 0

City summary

What the indexed records say

Olathe has 2 published ZIP profiles across Johnson County. The indexed median is 242 PPM, compared with 289 PPM across Kansas.

Among the 484 Kansascities with an indexed median, Olathe ranks #335from highest to lowest. Across all 541 state ZIP profiles, available estimates run from 72.2to 707 PPM.

The 241–243 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 hard2 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 7.7 miles
Profiles with evidence: 2/2

Confidence labels

High: 0Moderate: 2Low: 0

Observation window: Jan 11, 2016 to Jun 9, 2026.

ZIP directory

Water reports in Olathe

Open a ZIP for site-level provenance and measurements.

ZIP code

66061

Very Hard

243 PPM

Nearest site: 7.7 mi
Confidence: Moderate

View full ZIP evidence →

ZIP code

66062

Very Hard

241 PPM

Nearest site: 6.1 mi
Confidence: Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Olathe, City Of

PWSID KS2009115

Surface water

System population served: 143,014
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.

Record	System	Period	Status
Chlorine dioxide	KS2009115	Mar 1, 2025	Resolved
Public Notice	KS2009115	May 13, 2022	Resolved
Public Notice	KS2009115	May 13, 2022	Resolved
CARBON, TOTAL	KS2009115	Jan 1, 2021	Resolved

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Kansas communities

Edgerton

Johnson County

243 PPM median

Gardner

Johnson County

243 PPM median

Fontana

Linn County

242 PPM median

Linn Valley

Linn County

242 PPM median

Louisburg

Miami County

242 PPM median

Plains

Meade County

242 PPM median

Search all 485 Kansas cities →

Questions people ask

About water in Olathe

Is the water hard?

The indexed city median is 242 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.