Pub. Resources Code, § 3107

A district deputy in each district, designated by the supervisor, shall collect all necessary information regarding the oil and gas wells in the district, with a view to determining the presence of oil and gas sands and the location and extent of strata bearing water suitable for irrigation or domestic purposes that might be affected. The district deputy shall prepare maps and other accessories necessary to determine the presence of oil and gas sands and the location and extent of strata bearing water suitable for irrigation or domestic purposes or surface water suitable for those purposes. This work shall be done with the view to advising the operators as to the best means of protecting the oil and gas sands and the water-bearing strata and surface water, and with a view to aiding the supervisor in ordering tests or repair work at wells. All this data shall be kept on file in the office of the district deputy of the respective district.