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.
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About the Watershed
Learn about the San Francisco Bay Delta watershed, the largest estuary on the west coast of North and South America and the only inland delta in the world.
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Protecting the Watershed
Learn about EPA’s role in protecting the environmental quality of the San Francisco Bay Delta Watershed.
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Restoring the Watershed
Learn about EPA's work to restore the San Francisco Bay Delta Watershed by improving water quality.
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Tour the Watershed
Take an aerial tour of the largest watershed and estuary on the West Coast of the Americas.
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Real-Time Conditions
See real-time data on conditions in the San Francisco Bay Delta: water quality, species, environmental information and more.