Modifies provisions regarding appropriations for special education programs.

Revises the definition of "funded enrollment percent," to include the actual enrollment percent if above thirteen and five-tenths percent, for school districts with a student enrollment under one thousand students.

Requires the state allocation for the special education safety net to be specified in the omnibus appropriations act which must be at least five percent of the total allocated to school districts under RCW 28A.150.390 (2) (b) (section 1 (2) (b) of this act).

Encourages school districts to participate in the establishment or continuation of existing cooperative programs between or among school districts, or educational service districts and school districts, to provide special education and services to eligible students with disabilities.

Requires each special education cooperative to apply for approval of the program by the superintendent of public instruction before the 2019-2020 school year and every five years thereafter.