The USGS is working in partnership with California and federal agencies to answer the following questions about oil and gas development and groundwater resources: Where are protected groundwater resources? How close are oil and gas operations and protected groundwater, and what geologic materials separate them? Where is there evidence of fluids from oil and gas sources in protected groundwater? Where does evidence indicate no connections? When fluids from oil and gas sources are present in protected groundwater, what pathways or processes are responsible for observed transport? Have oil and gas operations as a whole contributed to water-quality changes in groundwater basins?
