San Francisco, CA water quality
San Francisco, CA is served by 4 public water systems, serving 1,038,545 people combined. Across those systems, we count 0 health-based violations in the last 5 years. The worst Tap Grade among them is B.
Get alerted when San Francisco's water gets a violation
Alert emails are in development; once they launch, we'll only email you about this water system. Unsubscribe anytime via contact@tapgraded.com.
Worried about what's in your tap?
See which water filters are certified to remove the contaminants found in your area.
Find a filter that matches your waterFrequently asked questions
Is San Francisco, CA tap water safe to drink?
4 public water systems serve San Francisco, CA, with 0 health-based violations in the last 5 years across them. The worst Tap Grade among them is B. A Tap Grade summarizes public EPA compliance records; it is not a determination that water is safe or unsafe to drink.
Does San Francisco's water have lead in it?
The most recent 90th-percentile lead sample is 0 ppb, versus the EPA action level of 15 ppb.
Has PFAS been detected in San Francisco's water?
Yes — at least one water system serving San Francisco has detected PFAS under UCMR5.
Other cities in California
See all of California →Source: EPA SDWIS/ECHO · Data as of 2026Q2
TapGraded presents public EPA data for information only — it is not health advice and not a determination that any water is safe or unsafe to drink. For health concerns, contact your water utility or local health department.