San Francisco, CA Tap Water Quality

Water quality in San Francisco, CA is currently rated with a moderate C grade (average score: 55/100 across 60 ZIP codes). This rating indicates that while the water provided by Sfpuc City Distribution Division is treated and regulated, there have been notable compliance issues or contaminant detections recently. Residents should stay informed about the specific challenges affecting their local supply.

The accumulation of 360 health-based violations over the past 5 years highlights systemic challenges within San Francisco's water infrastructure. When violations occur, it means that drinking water tests revealed contaminant levels exceeding safe limits, triggering mandatory corrective actions by California State Water Resources Control Board. The city relies on surface water, which may require significant treatment upgrades to address these recurring issues.

Additionally, lead exposure risk remains a critical issue for certain neighborhoods. EPA data indicates that 24 out of 60 ZIP codes in San Francisco are rated as High or Very High risk for lead. This risk is often driven by aging homes with pre-1986 plumbing containing lead solder or service lines. Families in these areas should test their tap water and consider NSF/ANSI 53 certified filters.