C44/100
Irvine Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 445,920 residents · California
What's In Irvine's Tap Water?
76
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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
IRVINE RANCH WATER DISTRICT
Population Served
444,800
Water Source
Surface Water
System ID
CA3010092
BIG BASIN WATER COMPANY
Population Served
1,120
Water Source
Groundwater
System ID
CA4410001
Frequently Asked Questions About Irvine Water
Is Irvine tap water safe to drink?
Irvine, California tap water receives a grade of C (44/100), which is considered fair. 0 contaminant(s) exceed EPA maximum contaminant levels and 53 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Irvine's water?
Of the 76 contaminants tested in Irvine's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Irvine have any water quality violations?
Yes, Irvine has 53 EPA violation(s) on record, with the most recent in 2022. Violation types include MON, MR, TT. 28 of these are health-based violations, which are the most serious category.
Do I need a water filter in Irvine?
Irvine 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. 1 contaminant(s) exceed these stricter goals.
Where does Irvine's tap water come from?
Irvine's drinking water is sourced from surface water and supplied by IRVINE RANCH WATER DISTRICT and 1 other water system(s). The system serves approximately 445,920 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Irvine'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. Irvine'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 Irvine's water compare to other cities in California?
Irvine's water quality score of 44/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Irvine's water quality?
If you have concerns about Irvine'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 (IRVINE RANCH WATER DISTRICT) 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.