A91/100
Simi Valley Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 94,738 residents · California
What's In Simi Valley's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
VENTURA WWD NO. 8 - SIMI VALLEY
Population Served
94,738
Water Source
Purchased Surface Water
System ID
CA5610023
Frequently Asked Questions About Simi Valley Water
Is Simi Valley tap water safe to drink?
Simi Valley, California tap water receives a grade of A (91/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA maximum contaminant levels (MCLs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Simi Valley's water?
69 contaminants were tested in Simi Valley's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Simi Valley have any water quality violations?
Yes, Simi Valley has 5 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, MCL. 1 of these are health-based violations, which are the most serious category.
Do I need a water filter in Simi Valley?
Simi Valley water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. All contaminants are within health goals.
Where does Simi Valley's tap water come from?
Simi Valley's drinking water is sourced from purchased surface water and supplied by VENTURA WWD NO. 8 - SIMI VALLEY. The system serves approximately 94,738 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Simi Valley's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Simi Valley's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Simi Valley's water compare to other cities in California?
Simi Valley's water quality score of 91/100 earns a grade of A, which is considered excellent. This places Simi Valley among the better-performing water systems in California. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Simi Valley's water quality?
If you have concerns about Simi Valley's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (VENTURA WWD NO. 8 - SIMI VALLEY) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.