Can someone help me detirmine if I need to get legal help?

metaphore went on a bit of a rant said
3

If there is anyone around here that is knowledgeable with law stuff, particularly rental/ tenants rights? Extra bonus if it's about Washington/Seattle. If someone is able to chat with me for a bit it would be super helpful.

The short version for anyone that can give any helpful advice is:

My apartment has bed bugs.
The building has 100+ units but management claims this is the first time there has ever been bed bugs in the building and that it is impossible for us to have gotten the bugs from another unit.
I have not traveled, visited anyone's home, or stayed in a hotel in over a year, there have been no guests in the apartment for over 6 months and even then no one stayed or brought anything in.
The management is being really shitty, and offering pretty much no help, and expects me to pay for any treatment.
The internet tells me that in Seattle landlords are supposed to be responsible for pest control, including bed bugs.
With the way the managers have been acting, I'm assuming if we able to get them to take care of the problem it will be a huge fight.
I don't want to live with bed bugs and want to get them dealt with as soon as possible.
After this incident and how management has treated me I don't really want to continue to live here(yes, I know I have to be treated before I move or I will just bring the bugs with me) but I have 9 months on my lease.

I just don't know how to handle this. Help plz :(