SB 624 proposes amendments to the Water Code, specifically modifying the criteria that groundwater conservation districts must consider when granting or denying a permit or permit amendment. The bill adds the requirement for districts to evaluate the impact of proposed water use on wells registered with the district that are exempt from obtaining permits, in addition to existing groundwater and surface water resources and other permit holders. It emphasizes alignment with water conservation efforts and management plans while ensuring groundwater quality and proper well closure practices.