What contaminants are in Simi Valley's water?

Simi Valley's water utility tests for 452 different contaminants. Currently, 10 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 Simi Valley?

Yes, we recommend using a water filter in Simi Valley. With 10 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 Simi Valley have any water quality violations?

VENTURA WWD NO. 8 - SIMI VALLEY 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 Simi Valley's water hard or soft?

Simi Valley's water has 161 PPM average hardness. Soft water is generally easier on plumbing and appliances, and requires less soap for cleaning.

What are the main contaminants in Simi Valley tap water?

The main contaminants of concern in Simi Valley's tap water include Bromoform, Gross Alpha Activity, 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 Simi Valley?

While you can technically drink tap water in Simi Valley as it meets legal requirements, 10 contaminants are above EPA health guidelines. We recommend using a certified water filter for optimal protection, especially for vulnerable individuals.

How often is Simi Valley's water tested?

VENTURA WWD NO. 8 - SIMI VALLEY 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 Simi Valley's tap water come from?

Simi Valley's drinking water comes from surface water purchased. 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 filtration before distribution.

What is the overall water quality in Simi Valley?

Simi Valley has 10 contaminants above EPA health guidelines (MCLGs) out of 452+ 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 Simi Valley water?

The most commonly detected contaminants in Simi Valley water include: Hardness (Total), pH, Carbon, Specific Conductivity, Bromoform. Of these, 10 exceed EPA health guidelines. These contaminants are regularly monitored by VENTURA WWD NO. 8 - SIMI VALLEY and reported to the EPA. View the detailed contaminant section above for specific levels and health information.

Simi Valley Tap Water Quality Report

Simi Valley's water has 10 contaminants above EPA MCLGs. We recommend using a certified water filter.

Utilities

3 Utilities

People Served

139,688

MCL Violations

Last Updated

2025-10-06

Is Simi Valley Tap Water Safe to Drink?

Simi Valley's water has 10 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 Simi Valley's water.

The data below shows test results from 3 water utilities serving 139,688 people in the Simi Valley area. Water quality testing is conducted regularly and reported to the EPA. This report was last updated 2025-10-06.

Search by ZIP code More CA cities

Simi Valley Water Service Areas

Loading service area map...

Recommended Water Filters for Simi Valley

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

Our Pick

EDITOR'S CHOICE

BEST BUDGET

Culligan

ZeroWater

24.99

NSF Certified:

NSF-42

NSF-53

NSF-401

NSF-372

Flow Rate

1.9 gpm

Daily Production

1 gpd

Removes 19 contaminants:

Nitrate, Copper, Zinc, Barium, Sulfate +14 more

View Details

Best Value

BEST LEAD REMOVAL

Whirlpool Corporation

W11256135

(40,578 reviews)

NSF Certified:

NSF-401

NSF-42

NSF-53

Capacity

1001 gal

Filter Life

3 mo

Flow Rate

0.7 gpm

Removes 19 contaminants:

1,2 Dichlorobenzene, 1,4 Dichlorobenzene, 2,4-D, Asbestos, Atrazine +14 more

View Details

Best Value

BEST LEAD REMOVAL

Whirlpool Corporation

W11569861

(1,273 reviews)

59.97

NSF Certified:

NSF-401

NSF-42

NSF-53

Capacity

1001 gal

Filter Life

3 mo

Flow Rate

0.52 gpm

Removes 22 contaminants:

1,2 Dichlorobenzene, 1,2,4 Trichlorobenzene, 1,4 Dichlorobenzene, 2,4-D, Asbestos +17 more

View Details

Highly Rated

EDITOR'S CHOICE

BEST CONTAMINANT REMOVAL

Clearly Filtered

550

NSF Certified:

NSF-42

NSF-53

NSF-401

Flow Rate

0.5 gpm

Daily Production

100 gpd

Removes 7 contaminants:

Chlorine, Lead, Fluoride, PFAS, Pharmaceuticals +2 more

View Details

Browse All Water Filter Types

Verify Your Water Quality with Independent Testing

With 10 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

Advanced Microplastics Test

$636

Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.

(30 reviews)

10-14 days

1+ tested

Advanced detection technology

Comprehensive particle analysis

Emerging contaminant testing

Order Test Kit

EPA-Certified Labs

7-10 Day Results

Easy Mail-In Collection

Browse All Test Kits

Frequently Asked Questions About Simi Valley Tap Water

Simi Valley's water has 10 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 Simi Valley's water.

Simi Valley Tap Water Quality Report

Is Simi Valley Tap Water Safe to Drink?

Simi Valley Water Service Areas

Recommended Water Filters for Simi Valley

ZeroWater

W11256135

W11569861

Browse All Water Filter Types

Verify Your Water Quality with Independent Testing

Advanced Home Water Test

Standard Home Water Test

Advanced Microplastics Test

Frequently Asked Questions About Simi Valley Tap Water

Is Simi Valley tap water safe to drink?

What contaminants are in Simi Valley's water?

Do I need a water filter in Simi Valley?

Does Simi Valley have any water quality violations?

Is Simi Valley's water hard or soft?

What are the main contaminants in Simi Valley tap water?

Can you drink tap water in Simi Valley?

How often is Simi Valley's water tested?

Where does Simi Valley's tap water come from?

What is the overall water quality in Simi Valley?

What are the most common contaminants detected in Simi Valley water?

Stay Informed About Your Water Quality