RCW 70.128.050: License—Required as of July 1, 1990—Limitations.

(1) After July 1, 1990, no person shall operate or maintain an adult family home in this state without a license under this chapter.

(2) Couples legally married or state registered domestic partners:

(a) May not apply for separate licenses; and

(b) May apply jointly to be coproviders if they are both qualified. One person may apply to be a provider without requiring the other person to apply.