San Francisco, California Water Quality Report
Comprehensive analysis of tap water safety based on EPA data
Last updated: January 2026
Is San Francisco's Water Safe to Drink?
Generally Safe. San Francisco's tap water meets EPA standards for drinking water quality. The water scored 97/100 in our analysis.
Contaminants Found in San Francisco's Water
1 contaminants tested • Data from EPA SDWIS database
| Contaminant | Level Detected | EPA Limit | % of Limit | Status |
|---|---|---|---|---|
Lead | 0 mg/L | 0.015 mg/L | 0.0% | Safe |
About San Francisco's Water System
SFPUC CITY DISTRIBUTION DIVISION
- PWS ID:
- CA3810011
- Population Served:
- 848,019
- Water Source:
- surface
A+97/100
San Francisco Water Quality Score
Based on EPA contaminant data and compliance records
100
Contaminants
100
Compliance
85
Infrastructure
Positive Findings
- Excellent overall water quality
- No recorded violations
- All tested contaminants well below EPA limits
- Low lead levels detected
Protect Your Family's Water
Even with good water quality, many families choose to filter their water for extra peace of mind.
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Other Cities in California
Compare water quality with nearby cities.
View all California cities →Frequently Asked Questions
- Where does San Francisco's water come from?
- San Francisco primarily uses surface water sources.
- How often is San Francisco's water tested?
- Water utilities are required to test for contaminants regularly and report results to the EPA.
- Should I use a water filter in San Francisco?
- While the water meets EPA standards, many families choose filters for extra peace of mind.