Pollutants

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  • A hybrid machine learning model to predict and visualize nitrate concentration throughout the Central Valley aquifer, California, USA

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    A hybrid machine learning model to predict and visualize nitrate concentration throughout the Central Valley aquifer, California, USA

    Science of the Total Environment | June 9, 2017...
    Summary

    Intense demand forwater in the Central Valley of California and related increases in groundwater nitrate concentration threaten the sustainability of the groundwater resource....

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  • Bioaccumulation of Pollutants in California Waters: A Review of Historic Data and Assessment of Impacts on Fishing and Aquatic Life

    Bioaccumulation of Pollutants in California Waters: A Review of Historic Data and Assessment of Impacts on Fishing and Aquatic Life

    California State Water Resources Control Board, San Francisco Estuary Institute | October 24, 2007...
    Summary

    This report was written for the State Water Resources Control Board’s Surface Water Ambient Monitoring Program (SWAMP) as a step toward the development...

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  • California’s Groundwater Update 2013: A Compilation of Enhanced Content for California Water Plan Update 2013

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    California’s Groundwater Update 2013: A Compilation of Enhanced Content for California Water Plan Update 2013

    California Department of Water Resources (DWR) | April 1, 2015...
    Summary

    The primary goal of California’s Groundwater Update 2013: A Compilation of Enhanced Content for California Water Plan Update 2013 (California’s Groundwater Update 2013)...

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  • Detections of current-use pesticides at 12 surface water sites in California during a 2-year period beginning in 2015

    Detections of current-use pesticides at 12 surface water sites in California during a 2-year period beginning in 2015

    U.S. Geological Survey (USGS), Central Valley Regional Water Quality Control Board | July 27, 2018...
    Summary

    Surface water samples were collected by the U.S. Geological Survey and multiple cooperators during base flow/irrigation runoff and storm runoff conditions from 12...

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  • DRERIP Ecosystem Conceptual Model: Chemical stressors

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    DRERIP Ecosystem Conceptual Model: Chemical stressors

    California Department of Fish and Wildlife | February 5, 2008...
    Summary

    The Sacramento-San Joaquin Delta ecosystem comprises many different habitat types, and is home to a large number of species. Thousands of chemical contaminants...

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  • Evaluation of Processes Affecting 1,2-Dibromo-3-Chloropropane (DBCP) Concentrations in Ground Water in the Eastern San Joaquin Valley, California: Analysis of Chemical Data and Ground-Water Flow and Transport Simulations

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    Evaluation of Processes Affecting 1,2-Dibromo-3-Chloropropane (DBCP) Concentrations in Ground Water in the Eastern San Joaquin Valley, California: Analysis of Chemical Data and Ground-Water Flow and Transport Simulations

    U.S. Geological Survey, University of California - Davis | December 17, 1999...
    Summary

    Future use of the sole-source aquifer near Fresno in the eastern San Joaquin Valley, California, will depend, in part, on how long 1,2-dibromo-3-chloropropane...

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  • Geohydrologic Framework of Recharge and Seawater Intrusion in the Pajaro Valley

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    Geohydrologic Framework of Recharge and Seawater Intrusion in the Pajaro Valley

    U.S. Geological Survey (USGS), Pajaro Valley Water Management Agency | July 17, 2003...
    Summary

    The Pajaro Valley Water Management Agency (PVWMA) was established in 1984 by the State of California as the agency charged with ground-water management...

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  • Geologic, Hydrologic, and Water-Quality Data From Multiple-Well Monitoring Sites in the Bunker Hill and Yucaipa Groundwater Subbasins, San Bernardino County, California, 1974–2016

    Geologic, Hydrologic, and Water-Quality Data From Multiple-Well Monitoring Sites in the Bunker Hill and Yucaipa Groundwater Subbasins, San Bernardino County, California, 1974–2016

    U.S. Geological Survey (USGS), San Bernardino Valley Municipal Water District | October 31, 2018...
    Summary

    In 1974, the U.S. Geological Survey (USGS), in cooperation with the San Bernardino Valley Municipal Water District, initiated a study to assess the...

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  • Groundwater Quality Data for the Madera/Chowchilla–Kings Shallow Aquifer Study Unit, 2013–14: Results from the California GAMA Program

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    Groundwater Quality Data for the Madera/Chowchilla–Kings Shallow Aquifer Study Unit, 2013–14: Results from the California GAMA Program

    U.S. Geological Survey (USGS), California State Water Resources Control Board | February 2, 2017...
    Summary

    Groundwater quality in the 2,390-square-mile Madera/Chowchilla–Kings Shallow Aquifer study unit was investigated by the U.S. Geological Survey from August 2013 to April 2014...

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  • Groundwater quality in the Cascade Range and Modoc Plateau, California

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    Groundwater quality in the Cascade Range and Modoc Plateau, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | April 1, 2015...
    Summary

    Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient...

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  • Groundwater Quality in the Klamath Mountains, California

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    Groundwater Quality in the Klamath Mountains, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | August 14, 2014...
    Summary

    The Klamath Mountains study unit covers more than 8,800 square miles and consists primarily of hard rock terranes characterized by high peaks and...

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  • Groundwater Quality in the Santa Barbara Coastal Plain, California

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    Groundwater Quality in the Santa Barbara Coastal Plain, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | August 1, 2016...
    Summary

    Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California established the Groundwater Ambient...

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  • Groundwater Quality in the Shallow Aquifers of the Tulare, Kaweah, and Tule Groundwater Basins and Adjacent Highlands areas, Southern San Joaquin Valley, California

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    Groundwater Quality in the Shallow Aquifers of the Tulare, Kaweah, and Tule Groundwater Basins and Adjacent Highlands areas, Southern San Joaquin Valley, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | January 11, 2017...
    Summary

    The Tulare Shallow Aquifer study unit covers approximately 2,320 square miles and consists of the Tulare, Kaweah, and Tule groundwater basins of the...

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  • Groundwater Quality in the Sierra Nevada, California

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    Groundwater Quality in the Sierra Nevada, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | December 23, 2014...
    Summary

    Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient...

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  • Groundwater Quality in the South Coast Interior Basins, California

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    Groundwater Quality in the South Coast Interior Basins, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | May 14, 2014...
    Summary

    The South Coast Interior Basins (SCI) study unit covers approximately 653 square miles and consists of the Livermore, Gilroy-Hollister, Cuyama Valley, Castac Lake...

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  • Groundwater Quality in the Western San Joaquin Valley, California

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    Groundwater Quality in the Western San Joaquin Valley, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | June 9, 2017...
    Summary

    Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient...

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  • Groundwater-Quality Data in the North San Francisco Bay Shallow Aquifer Study Unit, 2012: Results from the California GAMA Program

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    Groundwater-Quality Data in the North San Francisco Bay Shallow Aquifer Study Unit, 2012: Results from the California GAMA Program

    U.S. Geological Survey (USGS), California State Water Resources Control Board | October 23, 2014...
    Summary

    Groundwater quality in the 1,850-square-mile North San Francisco Bay Shallow Aquifer (NSF-SA) study unit was investigated by the U.S. Geological Survey (USGS) from...

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  • Hydraulic fracturing near domestic groundwater wells

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    Hydraulic fracturing near domestic groundwater wells

    Proceedings of the National Academy of Sciences of the United States of America (PNAS) | December 12, 2017...
    Summary

    Hydraulic fracturing operations are generating considerable discussion about their potential to contaminate aquifers tapped by domestic groundwater wells. Groundwater wells located closer to...

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  • Initial Trends in Chemical Contamination, Toxicity and Land Use in California Watersheds: Stream Pollution Trends (SPoT) Monitoring Program

    Initial Trends in Chemical Contamination, Toxicity and Land Use in California Watersheds: Stream Pollution Trends (SPoT) Monitoring Program

    California State Water Resources Control Board | April 1, 2013...
    Summary

    The State Water Resources Control Board’s Surface Water Ambient Monitoring Program (SWAMP) has released the second report on results from a continuing statewide...

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  • Land Use, Pollutants, and Water Quality in California Streams

    Land Use, Pollutants, and Water Quality in California Streams

    California State Water Resources Control Board | April 12, 2012...
    Summary

    A number of spatial patterns were evident in this survey of watersheds from throughout California. Stream sediment concentrations of heavy metals, such as...

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