I a little north of all that (Woodinville) but I brew organic whenever I can source ingredients. Homebrew Heaven in Everett has a decent selection of organic grains. I have not had success locally sourcing organic hops, however. I've actually talked a friend of mine with a small farm into growing some for me this season but it will be fall before I can harvest anything. I may grow a couple plants myself.
I have an organic amber ale recipe that I've developed that I'm extremely happy with.
I picked up a book on organic brewing but I haven't read it yet.