They have gluten free burger options, but they are not careful, and I have dealt with issues after eating there. If you are a Celiac, I do not recommend eating at Burgerville. However, their fries have a designated fryer, so they are safe, and they have extraordinary milkshakes. The GF burgers are awesome if you are willing to take the risk, just not a good idea for Celiacs disease.
Edit: I have learned through a bit more experimenting, and watching, that this problem is only in Woodland. I travel to Longview, or Vancouver if I want a GF burger, now. DO NOT eat at the Woodland Burgerville. In the other locations, though, if you ask them to, they change gloves, or many of them have a designated place for preparing the GF burgers. If you go inside, you can watch them prepare it, as well. Also, you will want to always tell them not to toast it, as most of them don't have designated places to toast the buns. I am confident in the people there to be careful, just NOT at this Woodland location.
— Not at all
— Gluten-free items are marked on the main menu
— Some
— Excellent