Every school district board of directors and educational service district superintendent may, in accordance with RCW
41.04.650 through
41.04.665, establish and administer a leave sharing program for their certificated and classified employees. For employees of school districts and educational service districts, the superintendent of public instruction shall adopt standards: (1) Establishing appropriate parameters for the program which are consistent with the provisions of RCW
41.04.650 through
41.04.665; and (2) establishing procedures to ensure that the program does not significantly increase the cost of providing leave.