Only eight of the 20 California watersheds most critically affected by subsidence have had their groundwater sustainability plans approved by state water officials, according to recent testimony before a state board.

The other 12 – most of which are in the San Joaquin Valley – had their plans marked “incomplete” by state water regulators and face a July deadline to fix their deficiencies, said Paul Gosselin, who oversees the Sustainable Groundwater Management Act office for the state Department of Water Resources.