I'm in S. Kitsap County, here in WA. I've had a home water-birth with both children, one in s.snohomish co. and over here in Kitsap. Both were fully covered by dshs. It was fairly easy. I applied and then chose a provider, i chose chpw both times and I've never had a problem with them in the least. After that i just presented my card and didn't worry about a thing.
If you think there's going to be a problem with anything I'd talk to your care provider first and ask them questions and then go from there.
I had to pay for my birthkit (about 40$) for both births, provide the pool, and supposed to pay for the birth assistant with the second birth.
The first birth my MW had a student MWs for assistants. I was fine with that. The one who actually attended my birth (first) is now a partner in their group of 3 MWs. :) which I think is pretty cool. For the second birth It was through a different group (different location) so her assistant is NOT a student. Which is fine, it was 150 I think. However, since I ended up delivering before anyone got here, including the assistant, I didn't have to pay for her. Sweet!
clear as mud, yeah?