groundwater contamination

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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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  • A Water Resources Data-Network Evaluation for Monterey County, California, Phase 3: Northern Salinas River Drainage Basin

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    A Water Resources Data-Network Evaluation for Monterey County, California, Phase 3: Northern Salinas River Drainage Basin

    U.S. Geological Survey, Monterey County Flood Control and Water Conservation District | December 15, 1990...
    Summary

    This report presents an evaluation of water resources data collection networks in the northern Salinas River drainage basin, Monterey County, California. The evaluation,...

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  • Californians Without Safe Water and Sanitation

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    Californians Without Safe Water and Sanitation

    Department of Water Resources | October 30, 2014...
    Summary

    While most Californians enjoy access to safe drinking water and adequate sanitation, some residents live in communities or areas that do not have...

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  • Communities that rely on a contaminated groundwater source for drinking water

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    Communities that rely on a contaminated groundwater source for drinking water

    State Water Resources Control Board | January 1, 2013...
    Summary

    AB 2222 (Caballero, Chapter 670, Statutes of 2008) requires the State Water Resources Control Board to submit a report to the Legislature that...

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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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  • Evaluation of the Source and Transport of High Nitrate Concentrations in Ground Water, Warren Subbasin, California

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    Evaluation of the Source and Transport of High Nitrate Concentrations in Ground Water, Warren Subbasin, California

    U.S. Geological Survey, Hi-Desert Water Agency, Mojave Water Agency | December 13, 2003...
    Summary

    From early 1995 through 2001, nitrate (NO3) concentrations in ground water in the Warren subbasin, California, increased from a background concentration of 10...

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  • Factors Affecting Public-Supply-Well Vulnerability to Contamination: Understanding Observed Water Quality and Anticipating Future Water Quality

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    Factors Affecting Public-Supply-Well Vulnerability to Contamination: Understanding Observed Water Quality and Anticipating Future Water Quality

    USGS | May 14, 2013...
    Summary

    As part of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program, a study was conducted from 2001 to 2011 to shed light...

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  • Global aquifers dominated by fossil groundwaters but wells vulnerable to modern contamination

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    Global aquifers dominated by fossil groundwaters but wells vulnerable to modern contamination

    Nature Geoscience | July 25, 2017...
    Summary

    The vulnerability of groundwater to contamination is closely related to its age. Groundwaters that infiltrated prior to the Holocene have been documented in...

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  • Groundwater Contributions of Flow, Nitrate, and Dissolved Organic Carbon to the Lower San Joaquin River, California, 2006–08

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    Groundwater Contributions of Flow, Nitrate, and Dissolved Organic Carbon to the Lower San Joaquin River, California, 2006–08

    U.S. Geological Survey (USGS), University of California at Davis (UCDavis), CalFed | October 8, 2013...
    Summary

    The influence of groundwater on surface-water quality in the San Joaquin River, California, was examined for a 59-mile reach from the confluence with...

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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 Coachella Valley, California

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    Groundwater Quality in Coachella Valley, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | January 9, 2013...
    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 Antelope Valley, California

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    Groundwater Quality in the Antelope Valley, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | January 9, 2013...
    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 Colorado River Basins, California

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    Groundwater Quality in the Colorado River Basins, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | January 9, 2013...
    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 Indian Wells Valley, California

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    Groundwater Quality in the Indian Wells Valley, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | January 9, 2013...
    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 Mojave Area, California

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    Groundwater Quality in the Mojave Area, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | January 9, 2013...
    Summary

    The Mojave study area is approximately 1,500 square miles (3,885 square kilometers) and includes four contiguous groundwater basins: Upper, Middle, and Lower Mojave...

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  • Groundwater Quality in the North San Francisco Bay Shallow Aquifer, California

    Groundwater Quality in the North San Francisco Bay Shallow Aquifer, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | February 23, 2018...
    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 Owens Valley, California

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    Groundwater Quality in the Owens Valley, California

    U.S. Geological Survey (USGS), California State Water Resources Control Board | January 9, 2013...
    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 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 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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