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Skip to main content Science Topics, centers, missions Products Maps, data, publications News Releases, I'm a reporter Connect Contact, chat, social media About Organization, jobs, budget Search Search Facebook Twitter LinkedIn Digg Reddit StumbleUpon Pinterest About Us Who We Are History Past Directors Organization Mission Areas Regions Science Centers Science Support Key Officials Congressional Briefing Series Statements Contacts Budget Opportunities Doing Business Contracts Grants and Cooperative Agreements Partners and Cooperators Building Partnerships Emergency Management Data and Tools Data and Tools Topics Real-time Data APIs Science Data Catalog Science Datasets Data Management Data Management Tools GIS Data Maps Map Topics Topographic Maps Geologic Maps GIS Data The National Map USGS Store Geographic Names Information System (GNIS) Publications USGS Publications USGS Library Software Multimedia Gallery Images Videos Audio Webcams Park Passes Featured Stories News Releases National News State News Science Snippets Technical Announcements Employees in the News Get Our News Media Contacts I'm a Reporter Request Footage Earthquake Questions Multimedia Gallery Key Officials Congressional Headquarters 12201 Sunrise Valley Drive Reston, VA 20192, USA 703-648-5953 Locations Contact Us 1-888-ASK-USGS Email Web Chat Staff Profiles Social Media Science Explorer Biology and Ecosystems Land Resources Coasts Data, Tools, and Technology Energy Environmental Health Geology Mapping, Remote Sensing, and Geospatial Data Minerals Natural Hazards Oceans Planetary Science Water Mission Areas Core Science Systems Ecosystems Energy and Minerals Environmental Health Land Resources Natural Hazards Water Resources Unified Interior Regions Frequently Asked Questions Education Facebook Twitter LinkedIn Delicious Digg Reddit StumbleUpon Pinterest Search Search + Home Science Data and Tools Maps Publications Software Multimedia News Connect Partners FAQs About Science + Science Explorer Mission Areas Unified Interior Regions Frequently Asked Questions Education Products + Data and Tools Maps Publications Software Multimedia Gallery Park Passes USGS Library News + Featured Stories News Releases Science Snippets Technical Announcements Employees in the News Get Our News Media Contacts I'm a Reporter Connect + Headquarters Locations Contact Us Staff Profiles Social Media About + About Us Organization Key Officials Congressional Budget Opportunities Doing Business Emergency Management Survey Manual Surface Water Providing scientific understanding and data about California surface-water resources for irrigation, public supply, ecosystems and more Explore the Science Groundwater Using interdisciplinary science to assess and quantify the availability and quality of California's groundwater resources Explore the Science Measuring and Monitoring Hydrologic data for water management decisions and protection of life and property Learn more California Oil, Gas, and Groundwater Working in partnership with state and federal agencies to answer questions about the effects of oil and gas on groundwater Learn More Home Science Data and Tools Maps Publications Software Multimedia News Connect Partners FAQs About Home The U.S. Geological Survey, (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 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. Explore Projects 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. Find out how California Water Data Basic hydrologic data collection, processing, analysis, dissemination, and archiving are major parts of the 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 Get CA Water Data News Date published: January 23, 2020 USGS Scientists Use Sound and Light to Measure Sediment in Water In two recent publications, scientists discuss their research using acoustic and optic technology to measure the quantity and movement of sediment in rivers and reservoirs. Attribution: 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. Attribution: 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 ... Attribution: View All News Publications Year Published: 2020 Multiple-well monitoring site adjacent to the Lost Hills oil field, Kern County, California The U.S. Geological Survey (USGS), in cooperation with the California State Water Resources Control Board, is evaluating several questions about oil and gas development and groundwater resources in California, including (1) the location of groundwater resources; (2) the proximity of oil and gas operations and groundwater and the geologic materials... Everett, Rhett R.; Kjos, Adam; Brown, Anthony A.; Gillespie, Janice M.; McMahon, Peter B. Attribution: , Water Resources View Citation Everett, R.R., Kjos, A., Brown, A.A., Gillespie, J.M., and McMahon, P.B., 2020, Multiple-well monitoring site adjacent to the Lost Hills oil field, Kern County, California: U.S. Geological Survey Open-File Report 2019–1114, 8 p., https://doi.org/10.3133/ofr20191114. Year Published: 2020 Uptake, metabolism, and elimination of fungicides from coated wheat seeds in Japanese quail (Coturnix japonica) Pesticides coated to the seed surface potentially pose an ecological risk to granivorous birds that consume incompletely buried or spilled seeds. To assess the toxicokinetics of seeds treated with current-use fungicides, Japanese quail (Coturnix japonica) were orally dosed with commercially coated wheat seeds. Quail were exposed to metalaxyl,... Gross, Michael S.; Thomas G. Bean; Hladik, Michelle; Rattner, Barnett A.; Kuivila, Kathryn Attribution: , Patuxent Wildlife Research Center , Water Resources , Ecosystems , Region 1: North Atlantic-Appalachian Year Published: 2020 Daily stream samples reveal highly complex pesticide occurrence and potential toxicity to aquatic life Transient, acutely toxic concentrations of pesticides in streams can go undetected by fixed-interval sampling programs. Here we compare temporal patterns in occurrence of current-use pesticides in daily composite samples to those in weekly composite and weekly discrete samples of surface water from 14 small stream sites. Samples were collected... Norman, Julia E.; Mahler, Barbara; Nowell, Lisa H.; Van Metre, Peter C.; Sandstrom, Mark W.; Corbin, Mark A.; Qian, Yaorong; Pankow, James F.; Luo, Wentai; Fitzgerald, Nicholas B.; Asher, William E.; McWhirter, Kevin J. 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