It’s not entirely clear how bad it is yet, but this is far more widespread than just Washington.

911 has been down today in major cities in various states across the US, including Arizona, Idaho, Texas, Missouri, Oregon... and maybe more.

I only realized this because I used to live in northern Arizona and received an emergency alert earlier today about 911 service being down in that area... then a couple hours later received the local one for King County, WA. After looking around a bit it turned out to be all over the US.