San Francisco Bay Delta Watershed

EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, the Pacific Islands, and 148 Tribal Nations.

The San Francisco Bay Delta watershed covers more than 75,000 square miles and includes the largest estuary on the west coasts of North and South America. It also contains the only inland delta in the world.

• Tour the Watershed

  

  Take an Aerial Tour of the Largest Watershed and Estuary on the West Coast of the Americas

  Take the Tour!

• Real-Time Conditions

  

  Get Real-Time Data on Conditions in the San Francisco Bay-Delta: Water Quality, Species, Environmental Information and More

  View Conditions

• Story Map

  

  Tour Projects that Protect and Restore San Francisco Bay and its Watersheds

  Tour the Projects