It shall be the intent and purpose of this chapter to establish educational service districts as regional agencies which are intended to:
(1) Provide cooperative and informational services to local school districts;
(2) Assist the superintendent of public instruction and the state board of education in the performance of their respective statutory or constitutional duties; and
(3) Provide services to school districts and to the Washington center for deaf and hard of hearing youth and the school for the blind to assure equal educational opportunities.