Gavin Newsom would give water agencies more leeway in how they comply with water rules. of California Water Agencies, which represents about 470 public agencies. The new update of the Delta water plan, formally called the Bay-Delta Water Quality Control Plan , has been years in the making. In 2018, the state water board released new rules intended to increase flows in the San Joaquin River. “Excessive water diversions are killing California’s key salmon runs,” said Barry Nelson, an advisor to the Golden State Salmon Assn., a nonprofit group.