Wash. Rev. Code § 59.18 § 59.18.550

(1) For the purpose of this section, "drug and alcohol free housing" requires a rental agreement and means a dwelling in which:
(a) Each of the dwelling units on the premises is occupied or held for occupancy by at least one tenant who is a recovering alcoholic or drug addict and is participating in a program of recovery;
(b) The landlord is a nonprofit corporation incorporated under Title 24 RCW, a corporation for profit incorporated under Title 23B RCW, or a housing authority created under chapter 35.82 RCW, and is providing federally assisted housing as defined in chapter 59.28 RCW;
(c) The landlord provides:
(i) A drug and alcohol free environment, covering all tenants, employees, staff, agents of the landlord, and guests;
(ii) An employee who monitors the tenants for compliance with the requirements of (d) of this subsection;
(iii) Individual and group support for recovery; and
(iv) Access to a specified program of recovery; and
(d) The rental agreement is in writing and includes the following provisions:
(i) The tenant may not use, possess, or share alcohol, illegal drugs, controlled substances, or prescription drugs without a medical prescription, either on or off the premises;
(ii) The tenant may not allow the tenant's guests to use, possess, or share alcohol, illegal drugs, controlled substances, or prescription drugs without a medical prescription, on the premises;
(iii) The tenant must participate in a program of recovery, which specific program is described in the rental agreement;
(iv) On at least a quarterly basis the tenant must provide written verification from the tenant's program of recovery that the tenant is participating in the program of recovery and the tenant has not used alcohol or illegal drugs;
(v) The landlord has the right to require the tenant to take a urine analysis test regarding drug or alcohol usage, at the landlord's discretion and expense; and
(vi) The landlord has the right to terminate the tenant's tenancy by delivering a three-day notice to terminate with one day to comply, if a tenant living in drug and alcohol free housing uses, possesses, or shares alcohol, illegal drugs, controlled substances, or prescription drugs without a medical prescription.
(2) For the purpose of this section, "program of recovery" means a verifiable program of counseling and rehabilitation treatment services, including a written plan, to assist recovering alcoholics or drug addicts to recover from their addiction to alcohol or illegal drugs while living in drug and alcohol free housing. A "program of recovery" includes Alcoholics Anonymous, Narcotics Anonymous, and similar programs.
(3) If a tenant living for less than two years in drug and alcohol free housing uses, possesses, or shares alcohol, illegal drugs, controlled substances, or prescription drugs without a medical prescription, the landlord may deliver a written notice to the tenant terminating the tenancy for cause as provided in this subsection. The notice must specify the acts constituting the drug or alcohol violation and must state that the rental agreement terminates in not less than three days after delivery of the notice, at a specified date and time. The notice must also state that the tenant can cure the drug or alcohol violation by a change in conduct or otherwise within one day after delivery of the notice. If the tenant cures the violation within the one-day period, the rental agreement does not terminate. If the tenant does not cure the violation within the one-day period, the rental agreement terminates as provided in the notice. If substantially the same act that constituted a prior drug or alcohol violation of which notice was given reoccurs within six months, the landlord may terminate the rental agreement upon at least three days' written notice specifying the violation and the date and time of termination of the rental agreement. The tenant does not have a right to cure this subsequent violation.
(4) Notwithstanding subsections (1), (2), and (3) of this section, federally assisted housing that is occupied on other than a transient basis by persons who are required to abstain from possession or use of alcohol or drugs as a condition of occupancy and who pay for the use of the housing on a periodic basis, without regard to whether the payment is characterized as rent, program fees, or other fees, costs, or charges, are covered by this chapter unless the living arrangement is exempt under RCW 59.18.040 .