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USGS - science for a changing world
Photo taken across the water of an artificial recharge pond in Joshua Tree, CA

Water Science in California

The U.S. Geological Survey, California Water Science Center (CAWSC) provides reliable, impartial, foundational data and scientific analysis to address water issues facing California today. We conduct hydrologic monitoring and investigative studies in partnership with Federal, State, and local agencies to assist them in managing California's water resources.

Data & Current Conditions

Graph of monthly California runoff, in inches, for water water years 2014-2017

Current Hydrology


Monthly and annual snowpack runoff data and graphs

Current Conditions

Streamflow | Groundwater | Water Quality

USGS WaterNow

Current-conditions for water data directly to your mobile phone or email.

Water Info via Email/Text  >>

Featured Science

photo of a USGS hydrologic technician collecting data from a streamgage along a flooded stream in Northern California

Topical Science

Our research covers the breadth of hydrologic science in California, including:

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excerpt of a map of groundwater model boundaries in California

Science Across California

Research is being conducted throughout California. Here are a few of our study areas:

Want to explore another area?  Search by County  >>

New and Noteworthy

Featured Articles

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News Releases

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Photo of a USGS California Water Science Center Hydrologist with a partner agency representative

The USGS California Water Science Center works with state and other Federal agencies to conduct studies that will give water managers the knowledge they need to effectively allocate water resources under increasing demands.

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