You don’t need a permit to be on Washington waters for up to 60 days, as long as your boat:
If you’ll be on Washington waters for more than 60 days, you must apply for a permit on or before the 60th day of your visit.
To apply for a permit, visit a vehicle/boat licensing office and bring along:
You may renew the permit once for an additional 60 days. When the renewed permit expires, you must either register your boat in Washington or remove your boat from Washington waters.
To prevent the spread of aquatic nuisance species, decontaminate your boat, trailer, and gear before entering Washington. For details, see Aquatic invasive species (Department of Fish and Wildlife).