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Fact Sheet

The Sacramento–San Joaquin Delta

By Jeffrey Mount, Ellen Hanak, Greg Gartrell

The Sacramento–San Joaquin Delta is California’s largest estuary and a vital hub in the state’s water supply system. Three interlinked issues currently face the Delta: an increasingly unreliable water supply, a decline in ecosystem health, and a fragile system of levees. Learn more about this key watershed in our new fact sheet.

Policy Brief

Policy Brief: Tracking Where Water Goes in a Changing Sacramento–San Joaquin Delta

By Greg Gartrell, Jeffrey Mount, Ellen Hanak

The Sacramento–San Joaquin Delta supplies water to roughly 30 million Californians, over 6 million acres of farmland, and countless ecosystems. But the watershed’s climate is changing: recent decades have seen record warmth, higher evaporation, and declining snowpack. We track where the water is going—and how to adapt.

data set

PPIC Delta Water Accounting

These spreadsheets contain all data, sources, and methods used to calculate water use in California’s Sacramento–San Joaquin Delta, including estimates of outflow needed to meet regulations; ecological, export, and municipal and industrial uses; and watershed-level water sources and upstream depletions.

Policy Brief

Policy Brief: Drought and California’s Agriculture

By Alvar Escriva-Bou, Josué Medellín-Azuara, Ellen Hanak, John Abatzoglou

California’s agricultural sector is the nation’s largest: it generates more than $50 billion dollars in annual revenue and employs more than 420,000 people. The ongoing drought is taking a toll on agriculture, related sectors, and rural communities, but there are ways to increase resilience in a warming world.

blog post

Reforming Water Rights in California

By Sarah Bardeen

Water rights reform has long been the third rail in California politics—but that might be changing, thanks to an intriguing new report. We speak with two of the report’s authors about why they undertook this effort now.

blog post

Water in 2021: Looking Back on a Year of Extremes

By Ellen Hanak

In California, 2021 was the year that climate change hit home. We look back at this year of extremes—and examine how our nonpartisan data and analysis informed conversations about how to address the tough water issues facing the state.

blog post

Are California’s Cities Conserving Enough Water?

By Alvar Escriva-Bou, Kurt Schwabe, Annabelle Rosser

As Californians eye the possibility of a third year of drought, there’s been some concern that urban residents are backsliding around water conservation, especially compared with the last major drought. We examine what cities are doing well—and where they could improve.

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