Legal Question in Real Estate Law in California

There is a statewide statutory notice period. A month-to-month tenant, or his/her landlord, needs to give 30 days' notice of termination to the other under Civil Code section 1946, except that the rental agreement can reduce the notice period down to seven days (which in my opinion would be very unusual). Orange County MIGHT have a different requirement under some local rent-control ordinance, and you should inquire locally about that. By the way, a 30-day notice can be given at any time during the month and the last day of a rental does not have to fall on the same day of the month as the rental began or that the rent is due.