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Water and petroleum well data used for preliminary regional groundwater salinity mapping near selected oil fields in central and southern California This digital data set contains total dissolved solids (either reported or calculated from specific conductance in lieu of reported total dissolved solids data), well construction, and well identifying information for 1,131 petroleum wells and 3,546 water wells used to map salinity in and around 31 southern and central California oil fields. The data set also includes ancillary data in the form of top perforation (petroleum wells), bottom perforation, well depth, or hole depth (water wells), land-surface elevation at the well head, and well location and identifier information. For petroleum wells missing top perforation depth (3 percent), the median top perforation depth for all wells within the field having top... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geochemistry, USGS Science Data Catalog (SDC), Water Quality Water chemistry data for samples collected at groundwater and surface-water sites near the Lost Hills and Belridge oil fields, November 2016–September 2017, Kern County, California (ver. 2.0, December 2021) An investigation was done by the U.S. Geological Survey, in cooperation with the California State Water Resources Control Board's Program of Regional Groundwater Monitoring of Water Quality in Areas of Oil and Gas Production, to assess the effects of oil and gas production activities on nearby groundwater resources. During November 2016–September 2017, 30 samples were collected at groundwater wells and 1 sample was collected at a surface-water site. This dataset contains site information and water chemistry results for samples collected near the Lost Hills and North and South Belridge oil fields, Kern County, California. Samples were analyzed for water-quality indicators, major and minor ions, nutrients, trace elements,... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Bakersfield, Belridge, California, Kern, Lost Hills, All tags... USGS Science Data Catalog (SDC), groundwater, groundwater quality, water chemistry, water quality, water sampling, Fewer tags Data analyzed for the preliminary prioritization of California oil and gas fields for regional groundwater monitoring There are 487 onshore oil and gas fields in California encompassing 3,392 square miles of aggregated area. The California State Water Resources Control Board (State Water Board) initiated a Regional Monitoring Program (RMP) in July 2015, intended to determine where and to what degree groundwater quality may be at potential risk to contamination related to oil and gas development activities including well stimulation, well integrity issues, produced water ponds, and underground injection. The first step in monitoring groundwater in and near oil and gas fields is to prioritize the 487 fields using consistent statewide analysis of available data that indicate potential risk of groundwater to oil and gas development.... Tags: California, USGS Science Data Catalog (SDC), Western United States, environmental resources, freshwater, All tags... groundwater, oil and gas fields, petroleum, prioritization, well perforations, Fewer tags Water chemistry data for samples collected at groundwater and surface-water sites near the Lost Hills and Belridge oil fields, November 2016–September 2017, Kern County, California This data release has been revised and the new version is available here: https://doi.org/10.5066/F7NS0T5M. Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Bakersfield, Belridge, California, Geochemistry, Hydrogeology, All tags... Kern, Lost Hills, USGS Science Data Catalog (SDC), Water Quality, Water Resources, groundwater, groundwater quality, water chemistry, water quality, water sampling, Fewer tags