The department of ecology, the department of natural resources, the department of health, and the *oil and gas conservation committee are authorized to participate fully in and are empowered to administer all programs of Part C of the federal Safe Drinking Water Act (42 U.S.C. Sec. 300h et seq.), as it exists on June 19, 1986, contemplated for state participation in administration under the act.
The department of ecology, in the implementation of powers provided herein shall enter into agreements of administration with the departments of health and natural resources and the *oil and gas conservation committee to administer those portions of the state program, approved under the federal act, over which the said departments and committee have primary subject-matter authority under existing state law. The departments of health and natural resources and the *oil and gas conservation committee are empowered to enter into such agreements and perform the administration contained therein.