Suppressors are now legal in Washington State to both own and use (RCW.41.250.1.C).  Generally speaking, if you can legally own a pistol, you can own a suppressor. Acquiring one is a simply paperwork process with a lengthy wait.  Once your paperwork is submitted, it is processed in what is typically a 6-9 month time frame. Once it is returned to us, you can get your newly purchased suppressor.

More information:

How to purchase a suppressor