Provides that a county planning under RCW 36.70A.040 may establish, in consultation with cities, a process for authorizing the siting of new mobile home parks and manufactured housing communities outside of urban growth areas designated under RCW 36.70A.110.

Provides that a county considering an application to site a new mobile home park or manufactured housing community outside of an urban growth area may approve the siting if the following criteria are met: (1) The proposed site is adjacent to or in close proximity to an urban growth area;

(2) Affordable housing will be provided within the mobile home park or manufactured housing community for a range of income levels;

(3) Appropriate infrastructure and services for the site are available or have been provided for;

(4) Environmental protection issues for the site, including air and water quality issues, have been provided for;

(5) Development regulations have been established to ensure that urban growth will not occur in adjacent nonurban areas;

(6) Provisions to mitigate adverse impacts on designated agricultural lands, forest lands, and mineral resource lands have been made; and

(7) The siting of the mobile home park or manufactured housing community does not conflict with development regulations adopted by the county to protect critical areas.