A99/100
San Bruno Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 41,327 residents · California
What's In San Bruno's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2010.
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
CITY OF SAN BRUNO
Population Served
41,327
Water Source
Purchased Surface Water
System ID
CA4110023
Frequently Asked Questions About San Bruno Water
Is San Bruno tap water safe to drink?
San Bruno, California tap water receives a grade of A (99/100), 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 San Bruno's water?
69 contaminants were tested in San Bruno's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does San Bruno have any water quality violations?
Yes, San Bruno has 1 EPA violation(s) on record, with the most recent in 2010. Violation types include MR. None of these are classified as health-based violations.
Do I need a water filter in San Bruno?
San Bruno 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 San Bruno's tap water come from?
San Bruno's drinking water is sourced from purchased surface water and supplied by CITY OF SAN BRUNO. The system serves approximately 41,327 people. Surface water sources include rivers, lakes, and reservoirs.
How often is San Bruno'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. San Bruno'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 San Bruno's water compare to other cities in California?
San Bruno's water quality score of 99/100 earns a grade of A, which is considered excellent. This places San Bruno 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 San Bruno's water quality?
If you have concerns about San Bruno'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 (CITY OF SAN BRUNO) 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.