Washington Revised Code Title 59. Landlord and Tenant § 59.18.253. Deposit to secure occupancy by tenant--Landlord's duties--Violation

(4)(a) If the prospective tenant does occupy the dwelling unit, then the landlord must credit the amount of the fee or deposit to the tenant's first month's rent or to the tenant's security deposit. If the prospective tenant does not occupy the dwelling unit, then the landlord may keep up to the full amount of any fee or deposit that was paid by the prospective tenant to secure the tenancy, so long as it is in accordance with the written statement of conditions furnished to the prospective tenant at the time the fee or deposit was charged.

(b) A fee or deposit to hold a dwelling unit or secure that the prospective tenant will move into a dwelling unit under this subsection does not include any cost charged by a landlord to use a tenant screening service or obtain background information on a prospective tenant.

(c) A portion of the fee or deposit may not be withheld if the dwelling unit fails a tenant-based rental assistance program inspection by a qualified inspector as defined in RCW 59.18.030. If the inspection does not occur within ten days from the date of collection of the fee or deposit or a longer period of time that the landlord and tenant may agree upon, the landlord may notify the tenant that the dwelling unit will no longer be held. The landlord shall promptly return the fee or deposit to the prospective tenant after the landlord is notified that the dwelling unit failed the inspection or the landlord has notified the tenant that the dwelling unit will no longer be held. The landlord complies with this section by promptly depositing the fee or deposit in the United States mail properly addressed with first-class postage prepaid.