What contaminants are in Olathe's water?

Olathe's water utility tests for 290 different contaminants. Currently, 6 contaminants are above EPA MCLGs. You can view detailed information about each contaminant, including test results, health effects, and comparisons to EPA MCLGs in the sections above.

Do I need a water filter in Olathe?

Yes, we recommend using a water filter in Olathe. With 6 contaminants above EPA MCLGs, a certified water filter can reduce your exposure to these substances. Look for filters certified for NSF-53 (health effects) or NSF-58 (reverse osmosis) that specifically remove the contaminants found in your water.

Does Olathe have any water quality violations?

WATER DISTRICT 1 OF JOHNSON CO currently has no reported Maximum Contaminant Level (MCL) violations, meaning the water meets all federal legal limits. However, health-based guidelines are often more protective than legal limits, which is why we compare test results to EPA MCLG Levels on this page.

Is Olathe's water hard or soft?

Olathe's water has 135 PPM average hardness. Soft water is generally easier on plumbing and appliances, and requires less soap for cleaning.

What are the main contaminants in Olathe tap water?

The main contaminants of concern in Olathe's tap water include Arsenic, Lead, Bromodichloromethane. These substances were found above EPA health-based guidelines. You can view detailed information about each contaminant, including health effects and recommended filters, in the contaminants section above.

Can you drink tap water in Olathe?

While you can technically drink tap water in Olathe as it meets legal requirements, 6 contaminants are above EPA health guidelines. We recommend using a certified water filter for optimal protection, especially for vulnerable individuals.

How often is Olathe's water tested?

WATER DISTRICT 1 OF JOHNSON CO is required by federal law to test water quality regularly. The frequency depends on the contaminant - some are tested daily (like bacteria), while others are tested monthly, quarterly, or annually. The test results shown on this page are from the most recent testing period reported to the EPA.

Where does Olathe's tap water come from?

Olathe's drinking water comes from surface water. Surface water sources include rivers, lakes, and reservoirs, which require more extensive treatment to remove sediments and potential contaminants. The utility treats this water using air stripping, biological filtration, filtration, softening before distribution.

What is the overall water quality in Olathe?

Olathe has 6 contaminants above EPA health guidelines (MCLGs) out of 290+ tested. While meeting federal legal limits (MCLs), the presence of contaminants above health-based guidelines suggests that using a certified water filter could provide additional protection, especially for sensitive populations.

What are the most common contaminants detected in Olathe water?

The most commonly detected contaminants in Olathe water include: Hardness (Total), pH, Total Dissolved Solids, Calcium, Arsenic. Of these, 6 exceed EPA health guidelines. These contaminants are regularly monitored by WATER DISTRICT 1 OF JOHNSON CO and reported to the EPA. View the detailed contaminant section above for specific levels and health information.

Olathe Tap Water Quality Report

Olathe's water has 6 contaminants above EPA MCLGs. We recommend using a certified water filter.

Utilities

3 Utilities

People Served

618,471

MCL Violations

Last Updated

2025-09-08

Is Olathe Tap Water Safe to Drink?

Olathe's water has 6 contaminants above EPA health-based guidelines. We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Olathe's water.

The data below shows test results from 3 water utilities serving 618,471 people in the Olathe area. Water quality testing is conducted regularly and reported to the EPA. This report was last updated 2025-09-08.

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Olathe Water Service Areas

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Recommended Water Filters for Olathe

Based on Olathe's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.

Our Pick

EDITOR'S CHOICE

BEST OVERALL PERFORMANCE

AquaTru

Classic

449

NSF Certified:

NSF-42

NSF-53

NSF-58

NSF-401

NSF-P473

NSF-372

Flow Rate

0.04 gpm

Daily Production

600 gpd

Removes 23 contaminants:

83+, Lead, Fluoride, Strontium, Uranium +18 more

View Details

Highly Rated

EDITOR'S CHOICE

BEST EFFICIENCY

AquaTru

Carafe

349

NSF Certified:

NSF-53

NSF-42

NSF-58

NSF-401

NSF-372

NSF-P473

Flow Rate

0.3 gpm

Daily Production

4 gpd

Removes 17 contaminants:

PFOA, PFOS, Chlorine, Lead, Fluoride +12 more

View Details

Best Value

Waterdrop

G3 P600

(135 reviews)

109.99

NSF Certified:

NSF-58

Flow Rate

600 gpm

Daily Production

600 gpd

Removes 4 contaminants:

Lead, Fluoride, Arsenic, Total Dissolved Solids

View Details

Highly Rated

BEST BEST TANKLESS RO FILTRATION SYSTEM FOR SMALL SPACES

Waterdrop

G3 P800

999

NSF Certified:

NSF-42

NSF-53

NSF-58

NSF-372

Flow Rate

800 gpm

Daily Production

800 gpd

Removes 15 contaminants:

10+ contaminants, Fluoride, Lead, Arsenic, 1,000+ +10 more

View Details

Browse All Water Filter Types

Verify Your Water Quality with Independent Testing

With 6 contaminants above EPA health guidelines, independent laboratory testing provides a second opinion and can track changes over time.

RECOMMENDED

SimpleLab

Advanced Home Water Test

$369

Most comprehensive home water test including all standard tests plus additional parameters for ultimate peace of mind.

(19 reviews)

7-10 days

300+ tested

EPA Certified

Tests 300+ parameters

Most thorough analysis available

EPA-certified laboratory

Order Test Kit

SimpleLab

Standard Home Water Test

$232

Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.

(209 reviews)

7-10 days

200+ tested

EPA Certified

Tests 200+ contaminants

EPA-certified laboratory

Easy mail-in sample collection

Order Test Kit

Tap Score

Haloacetic Acids (HAA9) Test

$275

Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.

7-10 days

9+ tested

EPA Certified

Tests 9 HAA compounds

Identifies chlorination byproducts

Important for chlorinated water

Order Test Kit

EPA-Certified Labs

7-10 Day Results

Easy Mail-In Collection

Browse All Test Kits

Frequently Asked Questions About Olathe Tap Water

Olathe's water has 6 contaminants above EPA MCLGs. We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Olathe's water.

Olathe Tap Water Quality Report

Is Olathe Tap Water Safe to Drink?

Olathe Water Service Areas

Recommended Water Filters for Olathe

Classic

Carafe

G3 P600

G3 P800

Browse All Water Filter Types

Verify Your Water Quality with Independent Testing

Advanced Home Water Test

Standard Home Water Test

Haloacetic Acids (HAA9) Test

Frequently Asked Questions About Olathe Tap Water

Is Olathe tap water safe to drink?

What contaminants are in Olathe's water?

Do I need a water filter in Olathe?

Does Olathe have any water quality violations?

Is Olathe's water hard or soft?

What are the main contaminants in Olathe tap water?

Can you drink tap water in Olathe?

How often is Olathe's water tested?

Where does Olathe's tap water come from?

What is the overall water quality in Olathe?

What are the most common contaminants detected in Olathe water?

Stay Informed About Your Water Quality