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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: 438

Three-Dimensional Chronostratigraphic Model and supporting well data for the Los Angeles Coastal Plain, Los Angeles and Orange Counties, California Three-Dimensional Chronostratigraphic Model and supporting well data for the Los Angeles Coastal Plain, Los Angeles and Orange Counties, California

This data release contains a digital geospatial dataset generated by the U.S. Geological Survey under a cooperative agreement with the Water Replenishment District of Southern California to characterize the three-dimensional hydrogeology of the Los Angeles Coastal Plain. The geospatial dataset covers about 580 square miles of the largest coastal plain of southern California and contains...
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California Water Science Center

Data for decadal shifts in groundwater age detected by environmental tracers across California, USA Data for decadal shifts in groundwater age detected by environmental tracers across California, USA

This data release documents seven tables containing environmental tracer data and lumped parameter model results used to evaluate temporal changes in groundwater age at 268 sites across California from 2004 to 2021. These sites are spatially distributed throughout the state and represent groundwater at depths used for public supply. Each site was sampled at least twice, with paired...
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California Water Science Center

Synthesized Domestic Well Database for the Conterminous United States Synthesized Domestic Well Database for the Conterminous United States

Self-supplied domestic water sources play a significant role in the United States' water landscape, serving approximately 13 percent of the nation's population as of 2015 (Dieter and others, 2018). However, these sources present unique challenges for water resource management and research due to the lack of monitoring, withdrawal location, and place-of-use data. To address this data gap...
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California Water Science Center

Geophysical, geological, hydrological, and geochemical data for aquifer salinity mapping in the Midway Valley, Kern County, California Geophysical, geological, hydrological, and geochemical data for aquifer salinity mapping in the Midway Valley, Kern County, California

The U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board (State Water Board) compiled and analyzed data for mapping groundwater salinity, characterizing aquifer systems, and documenting the effects of oil-field water disposal and well integrity issues in the Midway Valley area of San Joaquin Valley, California, associated with the Midway...
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California Water Science Center

Post-Optimization Scenarios for the Santa Barbara Groundwater Model, California Post-Optimization Scenarios for the Santa Barbara Groundwater Model, California

The city of Santa Barbara, in cooperation with the U.S. Geological Survey (USGS) California Water Science Center, developed a three-dimensional density-dependent groundwater-flow and solute-transport model (the Santa Barbara Flow and Transport Model; Paulinski and others, 2018; Nishikawa and others, 2018). The Santa Barbara Flow and Transport Model met the objectives of estimating the
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California Water Science Center

Santa Ana River Native Fish Population and Habitat Data, Santa Ana River, California, 2025 Santa Ana River Native Fish Population and Habitat Data, Santa Ana River, California, 2025

This dataset includes fish population and habitat data collected in 2025 to support development of the upper Santa Ana River Habitat Conservation Plan for the Santa Ana Sucker (Catostomus santaanae) and the Arroyo Chub (Gila orcuttii) in the Santa Ana River, California.
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California Water Science Center

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
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