RCW 59.18.253

(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.