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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: 434

Stable Isotope Concentrations in Native Fish Tissues Sampled on November 19, 2019, from the Santa Ana River, near Colton, California (ver. 1.1, September 2025) Stable Isotope Concentrations in Native Fish Tissues Sampled on November 19, 2019, from the Santa Ana River, near Colton, California (ver. 1.1, September 2025)

This dataset includes carbon-13 (d13C) and nitrogen-15 (d15N) stable isotope analysis from muscle, fin, and eye lens (laminae) tissues from Santa Ana sucker (Pantosteus santaanae) and arroyo chub (Gila orcutti) collected by the Riverside Corona Resource Conservation District (RCRCD) during a fish salvage effort in the Santa Ana River, near Colton, California, USA, on November 19, 2019...
By
California Water Science Center

Geochemical data for selected streams in the Clear Lake basin, Lake County, California Geochemical data for selected streams in the Clear Lake basin, Lake County, California

This dataset includes water-quality data for samples collected at sixteen sites in the Clear Lake Drainage Basin, Lake County, California, between November 2018 and March 2024. Sampling in the reach of the Scotts Creek drainage below the confluence with South Fork Scotts Creek (USGS stations 11448800 and 390236122575901) was done during November 2018 to May 2019 (water year 2019; water...
By
California Water Science Center

Data for assessing the susceptibility of groundwater used for domestic-supply, California Data for assessing the susceptibility of groundwater used for domestic-supply, California

This dataset provides groundwater age estimates for 175 wells used as domestic supply in four selected areas of California. Groundwater ages were estimated by calibration of environmental tracers (tritium, tritiogenic helium-3, sulfur hexafluoride, carbon-14 and radiogenic helium-4) to lumped parameter models (LPMs). Calibrated lumped parameter models provide the optimal mean age and...
By
California Water Science Center

GSFLOW model to extend the San Antonio Creek Integrated Model and simulate future water availability scenarios, San Antonio Creek Valley watershed, Santa Barbara County, California GSFLOW model to extend the San Antonio Creek Integrated Model and simulate future water availability scenarios, San Antonio Creek Valley watershed, Santa Barbara County, California

In the San Antonio Creek Valley Watershed (SACVW) of Santa Barbara County, California, climatic conditions, surface-water diversions, and groundwater withdrawals potentially affect water availability, magnitude of streamflow in San Antonio Creek, and the extent and quality of protected species habitat in the Barka Slough wetland. Future climate in central California may have warmer and...
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California Water Science Center

Development and efficiency of less intrusive survey methodologies for Santa Ana sucker (Pantosteus santaanae) monitoring Development and efficiency of less intrusive survey methodologies for Santa Ana sucker (Pantosteus santaanae) monitoring

The Santa Ana Sucker (Pantosteus santaanae) is a federally threatened species endemic to the Santa Ana, San Gabriel, and Los Angeles Rivers in southern California. Seasonal limitations on conventional sampling and inconsistencies in survey methodologies have led to an incomplete understanding of Santa Ana Sucker population dynamics. Therefore, alternative sampling methods that are not...
By
California Water Science Center

Pesticide Concentrations Measured During In-Situ Active Water Sampler Testing in Solano County, California, 2023 Pesticide Concentrations Measured During In-Situ Active Water Sampler Testing in Solano County, California, 2023

A novel U.S. Geological Survey-developed active water sampler was deployed at Ulatis Creek in Solano County, California for 24 hours from November 15, 2023 to November 16, 2023. Discrete surface water samples were collected at the start and end points of the active water sampler deployment interval for comparison to the active water sampler. Samples from the active water sampler and the...
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California Water Science Center

Pesticide concentrations in multiple stream matrices collected near Mead, Nebraska, 2022 Pesticide concentrations in multiple stream matrices collected near Mead, Nebraska, 2022

The AltEn bioenergy plant (Mead, Nebraska, USA) previously (2015 to 2021) generated ethanol from almost 100% unused/expired treated corn seeds. This use of treated corn seeds as a feedstock for ethanol production resulted in accumulation of large amounts of contaminated wastewater and solid residue at the plant, a portion of which was applied to surrounding farmland. To better understand...
By
California Water Science Center

Water-quality data including mercury and methylmercury at selected sites in the Cache Creek watershed, Yolo County, California Water-quality data including mercury and methylmercury at selected sites in the Cache Creek watershed, Yolo County, California

This dataset includes water-quality and sediment data for 647 environmental samples collected at 53 surface-water sites in Cache Creek (Cache C) watershed, Yolo County, California, between December 2009 and April 2019, and data for 190 associated quality-control samples (replicates and blanks). About 90 percent of the samples were collected at the following six primary sites that were...
By
California Water Science Center

Salinas Valley Integrated Hydrologic and Reservoir Operations Model, Monterey and San Luis Obispo Counties, California Salinas Valley Integrated Hydrologic and Reservoir Operations Model, Monterey and San Luis Obispo Counties, California

The Salinas Valley Groundwater Basin in Monterey and San Luis Obispo Counties of California is a highly productive agricultural area, contributes significantly to the local economy, and provides a substantial portion of vegetables and other agricultural commodities to the Nation. Increases in agricultural development and population have put increasing demand on both surface water and...
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California Water Science Center

Abundance and Distribution of Fishes in Lower Blue Lake, Lake County, California Abundance and Distribution of Fishes in Lower Blue Lake, Lake County, California

Field data for fishes sampled using bottom and surface gill nets during daylight hours on October 22-24, 2024 in Lower Blue Lake, Lake county, California, USA. This data release includes the results of all measured environmental parameters and fish taxa included in the analysis.
By
California Water Science Center

Groundwater-quality data in the Western Central Valley Domestic-Supply Aquifer Study Unit, 2023: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Western Central Valley Domestic-Supply Aquifer Study Unit, 2023: Results from the California GAMA Priority Basin Project

The U.S. Geological Survey collected groundwater samples from 44 wells used for domestic and small system drinking water supplies in the western Central Valley, California in 2023. The wells were sampled for the Western Central Valley domestic-supply aquifer study unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin...
By
California Water Science Center

Santa Ana River Native Fish Population and Habitat Data, Santa Ana River, California, 2024 Santa Ana River Native Fish Population and Habitat Data, Santa Ana River, California, 2024

This dataset includes fish population and habitat data collected in 2024 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.
By
California Water Science Center
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