Tap Water Quality in San Francisco, CA
Find out what's in your drinking water. Enter your ZIP code below for a detailed water quality report for San Francisco, California.
Try 94102 for San Francisco
San Francisco Drinking Water Overview
Population: ~875,000 | Source: Hetch Hetchy Reservoir in Yosemite National Park
San Francisco enjoys some of the highest-quality source water in the nation, drawn from Hetch Hetchy Reservoir in Yosemite. The water is so clean it does not require filtration, only disinfection. However, older buildings in the city may have lead plumbing that can leach into tap water, making at-the-tap testing important for residents of pre-1986 construction.
Common water quality concerns in San Francisco
Lead from older plumbing
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Disinfection byproducts
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Chromium-6 in blended supplies
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What's in your San Francisco water report
Contaminant levels
Every detected contaminant in your San Francisco water system, compared to EPA limits and health guidelines.
Violation history
All EPA violations on record for water systems serving San Francisco, including health-based and monitoring violations.
Water quality grade
An A through F grade based on violation history, contaminant levels, and health guideline comparisons.
Filter recommendations
Which type of water filter will actually remove the contaminants found in your specific water system.
Water quality in nearby cities
Check your San Francisco water now
Enter your ZIP code for a free water quality report specific to your water system in San Francisco, California.