Yep! We sure do have fish farms in WA. Here's a few locations that have farms:
Port Angeles Ediz Hook
South Bainbridge Island
Rochester by Scatter Creek

There's more out there but I can't think of them off the top of my head. These mentioned are all Atlantic Salmon Farms.
You could run an internet search for Omega, Cypress Is., news of bainbridge island escape. Some of the businesses have been closed down, others bought out, at least one is now a broodstock company.