Science Programs and Partnerships
Supplying necessary scientific information to local, state, and federal agencies, and non-governmental organizations
Supplying necessary scientific information to local, state, and federal agencies, and non-governmental organizations
Aquatic Ecology
Gaining better understanding of the effects that human activity, hydrologic extremes, and climate change have on aquatic ecosystems
Gaining better understanding of the effects that human activity, hydrologic extremes, and climate change have on aquatic ecosystems
Groundwater
Using science to assess and quantify the availability and quality of California's groundwater resources
Using science to assess and quantify the availability and quality of California's groundwater resources
Water Quality
Providing foundational data and scientific analysis to address water quality issues facing California
Providing foundational data and scientific analysis to address water quality issues facing California
Surface Water
Understanding the science about California surface-water use for irrigation, public consumption, and ecosystems
Understanding the science about California surface-water use for irrigation, public consumption, and ecosystems
California Flood Science
Helping emergency managers and others protect life and property from floods and other water-related hazards
Helping emergency managers and others protect life and property from floods and other water-related hazards
California Drought
Monitoring the effects of drought in California through data collection and research
Monitoring the effects of drought in California through data collection and research
California Water Science Center
The U.S. Geological Survey, California Water Science Center 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 tribal, federal, state, and local agencies to assist them in managing California's water resources.
Large Storms & Floods in California History
Large Storms & Floods in California History
Storms unleash torrential rain and intense winds, posing significant challenges to infrastructure and triggering widespread flooding. Since it became a state in 1850, California has experienced numerous large storms and floods.
Join the USGS Team
Join the USGS Team
Explore careers at the USGS, experience a day in the life of employees, navigate USAJobs, and see frequent questions on Federal hiring.
California Water & Drought Data
California Water & Drought Data
Basic hydrologic data collection, processing, analysis, dissemination, and archiving are major parts of the California Water Science Center program.
News
California Water Science Center Scientists to Present at 2024 IEP Annual Workshop
California Water Science Center Scientists to Present at 2024 IEP Annual Workshop
USGS Scientists to Present at 58th Biennial American Fisheries Society (AFS) Cal-Neva Meeting
USGS Scientists to Present at 58th Biennial American Fisheries Society (AFS) Cal-Neva Meeting
USGS provides easy access to Colorado River science with new online portal
USGS provides easy access to Colorado River science with new online portal
Publications
Nutrient chemistry in the Elizabeth Lake subwatershed—Effects of onsite wastewater treatment systems on groundwater and lake water quality, Los Angeles County, California
Nutrient (nitrogen [N] and phosphorus [P] chemistry) downgradient from onsite wastewater treatment system (OWTS) was evaluated with a groundwater study in the area surrounding Elizabeth Lake, the largest of three sag lakes within the Santa Clara River watershed of Los Angeles County, California.Elizabeth Lake is listed on the “303 (d) Impaired Waters List” for excess nutrients and is downgradient
Comparing modern identification methods for wild bees: Metabarcoding and image-based morphological taxonomic assignment
With the decline of bee populations worldwide, studies determining current wild bee distributions and diversity are increasingly important. Wild bee identification is often completed by experienced taxonomists or by genetic analysis. The current study was designed to compare two methods of identification including: (1) morphological identification by experienced taxonomists using images of field-c
Assessing spatial variability of nutrients, phytoplankton, and related water-quality constituents in the California Sacramento–San Joaquin Delta at the landscape scale—2018 high resolution mapping surveys
Executive Summary This study examined the abundance and distribution of nutrients and phytoplankton in the tidal aquatic environments of the Sacramento–San Joaquin Delta (Delta) and Suisun Bay, comprising three spatial surveys conducted in May, July, and October of 2018 that used continuous underway high frequency sampling and measurements onboard a high-speed boat to characterize spatial variatio
Science
Bay-Delta Catchability Study
Addressing Catchability Bias in Fish Surveys San Francisco Bay and the Sacramento-San Joaquin Delta collectively make up the "Bay-Delta." In the scientific study of fish, "catchability" refers to the probability that a fish will be captured by a particular fishing gear or method. Catchability is a measure of how effectively a fishing gear or method can capture fish. "Catch data" refer to...
Santa Ana River Native Fish Study
Native Fish Population and Habitat Study, Santa Ana River, California The Santa Ana River, the largest river in southern California, flows through diverse landscapes, from the high desert to urban and suburban areas in Orange, Riverside, and San Bernardino Counties, stretching approximately 96 miles (154 kilometers) from its headwaters in the San Bernardino Mountains to its mouth at the Pacific...
Culturally Prescribed Fire
Culturally prescribed burning has been long practiced by the Yurok Tribe for a variety of reasons. This study explores using culturally prescribed fire as a land management tool for increasing the resiliency of streams and watersheds.