The following residential facilities shall be exempt from the operation of this chapter:
(1) Nursing homes licensed under chapter
18.51 RCW;
(2) Assisted living facilities licensed under chapter
18.20 RCW;
(3) Facilities approved and certified under chapter
71A.22 RCW;
(4) Residential treatment centers for individuals with mental illness licensed under chapter
71.24 RCW;
(5) Hospitals licensed under chapter
70.41 RCW;
(6) Homes for individuals with developmental disabilities licensed under chapter
74.15 RCW.