Fire blight is common east of the Cascades but far less common on this side of the Cascades. It is most commonly found on this side in Asian pears.   With apples, some rootstocks are very resistant, others, not. Also, some apple varieties are more susceptible. Often, the problem is at the base of the trunk with little to no limb and twig symptoms. Also, it needs a unique combination of temperatures above 65 degrees F and high humidity for at least 24 hours. 

What are the symptoms you are seeing? 

Here is a link to a discussion of the disease: 

https://pnwhandbooks.org/plantdisease/host-disease/apple-malus-spp-fire-blight 

Chip Bubl, OSU Extension Agent/Columbia County (retired) <personal data hidden>