California Water Science Center

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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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News

Date published: December 9, 2019

USGS Hydrologist Collaborates with Danish Scientists on Groundwater Research

Groundwater provides much of the world's drinking water. When a supply of groundwater becomes contaminated, determining the timing and source of the contamination is an obvious concern. But the answers aren’t always clear. Contaminants may have different sources, even in a single groundwater well.

Date published: November 7, 2019

USGS Scientist to Discusses the Impacts of Agricultural Runoff in California’s Bay-Delta

Research Chemist, Dr. Michelle Hladik, presented her research on current-use pesticides being introduced into certain areas of California’s Bay-Delta ecosystem. Dr. Hladik’s presentation took place at the Society of Environmental Toxicology and Chemistry (SETAC) Annual...

Date published: October 15, 2019

The Ups and Downs of Groundwater Levels after the July 2019 Ridgecrest, CA Earthquakes

Effects from the two July 2019 Ridgecrest, CA earthquakes were observed in several USGS continuous groundwater-level monitoring sites in California, Nevada, and Arizona.

Publications

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Year Published: 2019

Pesticide Mixtures in the Sacramento–San Joaquin Delta, 2016–17: Results from Year 2 of the Delta Regional Monitoring Program

The Delta Regional Monitoring Program was developed by the Central Valley Regional Water Quality Control Board in response to the decline of pelagic fish species in the Sacramento–San Joaquin Delta that was observed in the early 2000s. The U.S. Geological Survey, in cooperation with the Delta Regional Monitoring Program, has been responsible for...

De Parsia, Matthew; Woodward, Emily E.; Orlando, James L.; Hladik, Michelle L.
De Parsia, M., Woodward, E.E., Orlando, J.L., and Hladik, M.L., 2019, Pesticide mixtures in the Sacramento–San Joaquin Delta, 2016–17: Results from year 2 of the Delta Regional Monitoring Program: U.S. Geological Survey Data Series 1120, 33 p., https://doi.org/10.3133/ds1120.

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Year Published: 2019

Observations of the spawning ecology of the imperiled Clear Lake Hitch Lavinia exilicauda chi

Migrations for the purposes of reproduction are widely documented across the animal kingdom and are particularly common in fishes and other aquatic organisms (Dingle 2014). One important migration strategy in fishes is potamodromy, which is the movement from one location to another entirely within freshwater (Morais and Daverat 2016). Thurow (...

Feyrer, Frederick
Feyrer, F, 2019, Observations of the spawning ecology of the imperiled Clear Lake Hitch Lavinia exilicauda chi: California Fish and Game

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Year Published: 2019

Near-field receiving-water monitoring of trace metals and a benthic community near the Palo Alto Regional Water Quality Control Plant in south San Francisco Bay, California—2018

Trace-metal concentrations in sediment and in the clam Macoma petalum (formerly reported as Macoma balthica), clam reproductive activity, and benthic macroinvertebrate community structure were investigated in a mudflat 1 kilometer south of the discharge of the Palo Alto Regional Water Quality Control Plant (PARWQCP) in south San...

Cain, Daniel J.; Thompson, Janet K.; Parchaso, Francis; Pearson, Sarah; Stewart, Robin; Turner, Matthew A.; Shrader, Kelly H.; Zierdt Smith, Emily L.; Luoma, Samuel N.
Cain, D.J., Thompson, J.K., Parchaso, F., Pearson, S., Stewart, R., Turner, M., Shrader, K.H., Zierdt Smith, E.L., and Luoma, S.N., 2019, Near-field receiving-water monitoring of trace metals and a benthic community near the Palo Alto Regional Water Quality Control Plant in south San Francisco Bay, California—2018: U.S. Geological Survey Open-File Report 2019–1084, 41 p., https://doi.org/10.3133/ofr20191084.