The Division of Oil, Gas, and Geothermal Resources (DOGGR), is part of the Department of Conservation, and was formed in 1915,
and currently supervises the drilling, operation, maintenance, and plugging and abandonment of onshore and offshore oil, gas, and geothermal wells.
Their job is to prevent damage to: (1) life, health, property, and natural resources;(2) underground and surface waters suitable for irrigation or domestic use; and (3) oil, gas, and geothermal reservoirs.
Another valuable reference is the California Independent Petroleum Association website
California Independent Petroleum Association
Founded in 1976, CIPA is a non-profit, non-partisan trade association representing some 450 independent crude oil and natural gas producers, royalty owners, and service and supply companies operation in California.
The association keeps the political, regulatory and public policy interests of independent oil and gas producers at the forefront of its agenda.
They regularly represent the diverse interests of its membership before the California State Legislature, the United States Congress and numerous federal, state and local regulatory agencies.