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Data analyzed for the preliminary prioritization of California oil and gas fields for regional groundwater monitoring


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Davis, T.A., Bennett, G.L., Metzger, L.F., Kjos, A.R., Peterson, M.F., Johnson, J., Johnson, T.D., Brilmyer, C.A., and Dillon, D.B., 2018, Data analyzed for the preliminary prioritization of California oil and gas fields for regional groundwater monitoring: U.S. Geological Survey data release,


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. There were limited [...]

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Point of Contact :
Tracy Davis
Distributor :
U.S. Geological Survey - ScienceBase
USGS Mission Area :
Water Resources
SDC Data Owner :
California Water Science Center

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Data were used to evaluate four factors related to the intensity of petroleum resource development and proximity to groundwater resources: petroleum-well density, volume of water injected in oil and gas fields, vertical proximity of oil and gas resource development to groundwater resources, and density of water wells overlying and adjacent to the fields. In the larger work associated with this data release, California oil and gas fields were prioritized for regional monitoring based on the statewide reconnaissance assessment of the fields' physical characteristics. Additional data sources and methods for evaluating each of the factors are described in the larger work.


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ScienceBase WMS


  • California Oil, Gas, and Groundwater
  • USGS California Water Science Center
  • USGS Data Release Products



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DOI doi:10.5066/F7FJ2DV3

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