Any county, municipality, or other political subdivision of the state acting through its principal supervising official or governing body may, whenever funds shall be available for that purpose provide for all or a part of hospitalization and medical aid for its employees and their dependents through contracts with regularly constituted insurance carriers or with health care service contractors as defined in chapter
48.44 RCW or self-insurers as provided for in chapter
48.62 RCW, for group hospitalization and medical aid policies or plans: PROVIDED, That any county, municipality, or other political subdivision of the state acting through its principal supervising official or governing body shall provide the employees thereof a choice of policies or plans through contracts with not less than two regularly constituted insurance carriers or health care service contractors or other health care plans, including but not limited to, trusts of self-insurance as provided for in chapter
48.62 RCW: AND PROVIDED FURTHER, That any county may provide such hospitalization and medical aid to county elected officials and their dependents on the same basis as such hospitalization and medical aid is provided to other county employees and their dependents: PROVIDED FURTHER, That provision for school district personnel shall not be made under this section but shall be as provided for in RCW
28A.400.350.