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Yes. Here's the WA law:
Month-to-Month Agreements. If the landlord wants to change the provisions of a month-to-month rental agreement, such as raising the rent or changing rules, the tenant must be given at least 30 days notice in writing. (Less notice is not allowed under the law.) These changes can only become effective at the beginning of a rental period (the day the rent is due).
The Landlord-Tenant Act does not limit how much rent can be raised, or how often. However, the landlord cannot raise the rent to retaliate against a tenant.
http://www.nwapartmentsales.com/washington_state_landlord_tenant_law.htm#If%20the%20Landlord%20Wants%20to%20Make%20Changes
rich
Lawyer (JD)
NYC Trial Atty. 30 yrs.- pers. inj., contracts, real estate, criminal, estates, matrimonial.