Washington state law requires a twenty day notice telling a tenant they have to vacate the premises and a thirty notice to raise the rent. This is the minimum notice; the lease or local ordinance may require more notice. (Notices in Seattle, for instance, are much more complicated.) Notice must be received by the tenant 20 or 30 days before the end of the lease. If a tenant is on a month-to-month rental agreement, think of each monthly period as a lease.
Each signatory to the lease must receive a separate notice, even if they are married.
Nothing found herein should be construed as an attempt to offer or render a legal opinion or otherwise engage in the practice of law. You should obtain the advice of an attorney well versed in these matters.