California Water Science Center


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.

Find out more about about CAWSC science programs and partnerships

Water Research Projects

Water Research Projects

Over 100 research projects addressing California's key water issues including: long-term water supply and availability, water quality, droughts and floods, climate change, aquatic ecology, the Delta, management of watersheds and groundwater.

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Partnering with Us

Partnering with Us

The USGS partners with local, state, and other federal agencies to provide scientific information needed by water-resources managers across the Nation.

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California Water Data

Basic hydrologic data collection, processing, analysis, dissemination, and archiving are major parts of the California Water Science Center program.

National Water Information System Mapper

Current California Streamflow Conditions

California Runoff

USGS WaterWatch

USGS Flood Event Viewer

California Post-Fire Debris-Flow Maps

California Water-Quality Mapper

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Date published: May 17, 2019

California Water Science Center Scientists Present at 2019 Federal Interagency Conference

California Water Science Center (CAWSC) hydrologists Joseph Hevesi, Scott Wright, Alexandra Etheridge, Mathieu Marineau, and Michelle Stern will discuss their research at the 2019 Federal Interagency Sedimentation and Hydrologic Modeling (SEDHYD) Conference in Reno, Nevada.

Date published: May 2, 2019

California Water Science Center Hydrologist Receives Award for Intervention Training

California Water Science Center Hydrologist, Alexandra (Alex) Etheridge will receive an excellence in leadership award at this year’s USGS Honor Awards Ceremony, to be held on May 7, 2019...

Date published: April 22, 2019

USGS Participates in Earth Day Festivities on Alcatraz Island

On April 20th, the USGS California Water Science Center (CAWSC) participated in annual Earth Day festivities on Alcatraz Island in San Francisco Bay. Involvement in the event included science presentations on the island, demonstrating the ongoing research of the USGS Estuarine Hydrodynamics and Sediment Transport team based in Sacramento.


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Year Published: 2019

Aluminum- and iron-based coagulation for in-situ removal of dissolved organic carbon, disinfection byproducts, mercury and other constituents from agricultural drain water

Agricultural production on wetland soils can be significant sources of dissolved organic carbon (DOC), disinfection byproduct precursors, mercury and nutrients to downstream water bodies and accelerate land subsidence. Presented as a potential solution for in-situ water quality improvement and land subsidence mitigation, chemically enhanced...

Bachand, Sandra M.; Kraus, Tamara E. C.; Stern, Dylan; Ling Liang, Yan; Horwath, William R.; Bachand, Philip A. M.

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Year Published: 2019

Groundwater quality in the Sacramento Metropolitan shallow aquifer, California

The Sacramento metropolitan (SacMetro) study unit covers approximately 3,250 square kilometers of the Central Valley along the eastern edge of the northern and southern ends of the San Joaquin and Sacramento Valleys, respectively. Groundwater withdrawals supply a significant portion of the water-resource needs of the region. In the southern...

Bennett V, George L.
Bennett, G.L. V, 2019, Groundwater quality in the Sacramento Metropolitan shallow aquifer, California: U.S. Geological Survey Open-File Report 2019–1047, 4 p.,

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Year Published: 2019

Strontium isotopes reveal ephemeral streams used for spawning and rearing by an imperiled potamodromous cyprinid--Clear Lake hitch Lavinia exilicauda chi

Identification of habitats responsible for the successful production and recruitment of rare migratory species is a challenge in conservation biology. Here, a tool was developed to assess life stage linkages for the threatened potamodromous cyprinid Clear Lake hitch Lavinia exilicauda chi. Clear Lake hitch undertake migrations from Clear Lake...

Feyrer, Frederick; Whitman, George; Young, Matthew; Johnson, Rachel C.