Active Alerts

If you are experiencing a water, power, or sewer emergency or service problem call our 24-hour hotline at 3-1-1 or (415) 701-2311 from outside SF or log on at sf311.org. Learn more or review active service alerts.

Understanding Your Tap Water

Our tap water is among the best in the nation. We are proud of it and hope you are, too.

You might have specific questions about your tap water. We hope these subject specific fact sheets help answer those questions and direct you to further resources to find out even more.

Emerging Contaminant Monitoring

Unregulated microorganisms and synthetic or naturally-occurring chemicals that are not commonly monitored by water utilities are termed contaminants of emerging concern (CECs). More than 100,000 chemicals are registered in the US, and new chemicals and microorganisms continue to be identified. Some of these contaminants can be detected at extremely low levels in the environment by ever-improving laboratory methods. The health significance of these trace contaminants is typically unknown. We are proactively addressing CECs through participation in national research projects and conducting independent monitoring of our source and treated waters. To learn more, read the following technical memorandums: 

Fact Sheets