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Data

Providing current data for analysis, forecasting, and research

Providing current data for analysis, forecasting, and research

Basic hydrologic data collection, processing, analysis, dissemination, and archiving are major parts of the California Water Science Center program. Streamflow data, for example, are used for flood and water-supply forecasts, planning and design, river regulation, streamflow statistics, and research investigations. Much of the data are available on a near-real-time basis by satellite telemetry.

California Water Dashboard

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View California's real-time stream, lake, reservoir, precipitation, water quality, and groundwater stations in context with current weather and hazard conditions.

Current Conditions

California Groundwater Quality

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This interactive webmap plots water-quality data from domestic and public-supply wells sampled by the USGS for the California GAMA Priority Basin Project, and allows users to download datasets.

Water Quality Data

California Water Data

Filter Total Items: 431

Water-quality data for treated drinking water and treated wastewater effluent at Fort Irwin National Training Center, California Water-quality data for treated drinking water and treated wastewater effluent at Fort Irwin National Training Center, California

Fort Irwin National Training Center uses treated groundwater for both drinking and irrigation purposes. Wastewater is treated locally at Fort Irwin National Training Center using tertiary treatment methods and the treated wastewater effluent is discharged into percolation ponds and allowed to percolate into the local groundwater system. Specific conductance, total dissolved solids...
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California Water Science Center

Electrical resistivity tomography (ERT) geophysical survey at Brookside West, Beaumont, California, December 2024 Electrical resistivity tomography (ERT) geophysical survey at Brookside West, Beaumont, California, December 2024

Surface electrical resistivity tomography (ERT) data were acquired December 2 - 5, 2024 by the U.S. Geological Survey (USGS) at the San Gorgonio Pass Water Agency's Brookside West site in Beaumont, California. The purpose of this survey was to map near surface geologic structure in an area that the San Gorgonio Pass Water Agency plans to develop as a managed aquifer recharge site. Three...
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California Water Science Center

Total Applied Surface Water and Groundwater Irrigation Data from Four Areas to Support Analysis for Estimating Irrigation Consumptive Use for the Conterminous United States Total Applied Surface Water and Groundwater Irrigation Data from Four Areas to Support Analysis for Estimating Irrigation Consumptive Use for the Conterminous United States

This digital dataset contains irrigation applications and consumptive use at the agricultural-field scale (average 173 acres) and twelve-digit watershed scale (HUC12) for four regions in the conterminous United States representing calendar years 2000-2020. Agricultural field-scale irrigation depths of applied groundwater and surface water for selected agricultural fields were compiled...
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California Water Science Center

Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025) Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025)

This dataset contains multiple types of data characterizing phytoplankton in the Sacramento-San Joaquin Delta (California, USA). 1) Bright field microscopy was used to identify and enumerate phytoplankton community composition; 2) Epifluorescent microscopy was used to enumerate picophytoplankton (phytoplankton cells less than 2 microns in diameter) and, 3) a categorical visual index...
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California Water Science Center

Laboratory optical measurements for selected streams in the Clear Lake basin, Lake County, California Laboratory optical measurements for selected streams in the Clear Lake basin, Lake County, California

Clear Lake, situated in the Coast Range west of California's Central Valley, is the largest natural freshwater lake entirely within the state. It consists of three distinct arms: the Upper Arm-a large, open-water area to the northwest; the Lower Arm-a smaller, narrower section to the southeast; and the Oaks Arm-the smallest and narrowest region, located to the east. Water quality in...
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California Water Science Center

Concurrent Occurrence of Pesticides and Per- and Polyfluoroalkyl Substances (PFAS) in Agricultural Streams in California, USA Concurrent Occurrence of Pesticides and Per- and Polyfluoroalkyl Substances (PFAS) in Agricultural Streams in California, USA

Per-and polyfluoroalkyl substances (PFAS) are frequently found in streams, with most research focusing on urban sources of PFAS to surface water (e.g., firefighting foams, industrial releases, and wastewater treatment plant discharges). Pesticide applications are an under-investigated source of PFAS to streams in both agricultural and urban areas. There are few studies that analyze the...
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California Water Science Center

Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025 Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025

Broad-area, high-resolution, boat-based water quality mapping surveys of the Sacramento-San Joaquin Delta (Delta) were conducted in June and September of 2024. Each survey was comprised of one day of high-resolution mapping. The regions covered included Discovery Bay and Old and Middle Rivers in the South Delta Tidal Transition Zone. On each day, the route of the mapping survey was...
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California Water Science Center

Integrated Hydrological Model for Simulating the Impacts of Spring Diversions on Streamflow in the Strawberry Creek Watershed, San Bernardino County, California Integrated Hydrological Model for Simulating the Impacts of Spring Diversions on Streamflow in the Strawberry Creek Watershed, San Bernardino County, California

The Strawberry Creek watershed, situated in the San Bernardino Mountains of southern California, features a group of natural springs known as Arrowhead Springs that have been augmented with diversions in the form of sub-horizontal borings and tunnels. Understanding the impact of these structures on streamflow through groundwater capture is crucial for understanding the impacts of spring...
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California Water Science Center

Domestic self-supplied household locations, counts, and withdrawal estimates in the conterminous United States: model and dataset for decadal year 2020 Domestic self-supplied household locations, counts, and withdrawal estimates in the conterminous United States: model and dataset for decadal year 2020

The U.S. Geological Survey is developing national water-use estimates as part of a project to support water resources management in the United States. Models support a nationally consistent approach to estimating water-use, are repeatable and reusable for their stated purpose which supports efficient updates to the results and have capabilities that allow users to generate forecasts of...
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California Water Science Center

Basin-fill thickness of the Arroyos and Northeast Air Force Research Laboratory areas, Edwards Air Force Base, California Basin-fill thickness of the Arroyos and Northeast Air Force Research Laboratory areas, Edwards Air Force Base, California

This data release contains a gridded shapefile of basin-fill thickness constructed from geologic maps, gravity-derived depth to bedrock, and a digital elevation model. The data were generated by the U.S. Geological Survey under cooperative agreement with the U.S. Air Force Civil Engineer Center to characterize the hydrogeology of the Arroyos and Northeast Air Force Research Laboratory...
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California Water Science Center

Select Borehole Data for the Salton Sea area and vicinity, Imperial-Riverside-San Diego-San Bernardino Counties, CA Select Borehole Data for the Salton Sea area and vicinity, Imperial-Riverside-San Diego-San Bernardino Counties, CA

Borehole lithology data from drillers' log descriptions were compiled for the Salton Sea area and vicinity. This data will be utilized to support hydrogeologic and hydrologic investigations. Data for some parts of the Salton Sea Watershed were already compiled for other USGS reports. These included Borrego Valley (Faunt and others, 2015), and the East Mesa (Shepherd and Rosenberg, 2024)...
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California Water Science Center

Cyanotoxins in the California Sacramento-San Joaquin Delta: Whole Water Cyanotoxin Samples Cyanotoxins in the California Sacramento-San Joaquin Delta: Whole Water Cyanotoxin Samples

This dataset is comprised of cyanotoxin concentrations from whole water cyanotoxin samples collected at water quality stations in the Sacramento-San Joaquin Delta, beginning in 2020. Cyanotoxin congeners were measured from whole water cyanotoxin samples within the cyanotoxin classes: microcystins, anatoxins, cylindrospermopsins, saxitoxins, anabaenopeptins, and nodularin. Concentrations...
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California Water Science Center
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