How many unrelated tenants in one home for pierce county, WA

[Eangelic San Agustin]

Hello all, I’m fairly new to BP. I currently have two housemates but I’m looking to add another roommate to the mix. The new roommate would have their own private bedroom space. I’m mainly looking into this so I can put more money aside for my next investment. Another reason being my current tenants are leaving around the same time in the next couple months. Although I can pay my mortgage myself, I’ve really enjoyed how much I’ve been saving with the roommates.

With that being said, does anyone know the Pierce county, wa laws in regards to how many unrelated people can live under one roof? I’ve tried googling but can’t find a clear cut answer. If you also have a link, that would be greatly appreciated. Thanks in advance!