Whenever a majority of the employees employed by the district in a unit appropriate for collective bargaining indicate a desire to be represented by a labor organization and upon determining, as provided in Section 125521, that the labor organization represents at least a majority of the employees in the appropriate unit, the district and the accredited representative of employees shall bargain in good faith and make all reasonable efforts to reach agreement on the terms of a written contract governing wages, hours, pensions, and working conditions.