There is a relatively new web site that captures burn ban status throughout the State, it is called “WA Burn Bans”. Several, but not all, jurisdictions are using it to post their current ban status. The Puget Sound Clean Air Agency and State DNR are also updating their ban status on the site.
Here is a direct link to the Wa Burn Ban web site: https://waburnbans.net/
King County has just updated our information on that web page and is still at stage 1. Our King County Fire Marshal web site now simply states there is a ban and provides a link to the WA Burn Ban site for more details. See the “Current burn ban news” on the King County’s web site: http://www.kingcounty.gov/depts/permitting-environmental-review/fire-marshal/BurnBanInfo.aspx