I only have gluten sensitivity but I always mention celiac when I go somewhere new. The staff behind the counter looked at me like I was speaking French. I would say unsafe for celiacs. When I asked for no cheese on my tacos I got two tacos with a dusting of cheese on them. Really should only rate two stars but they were super nice about it.
When I am driving on i80 and need fast food, I stop here and get a burrito bowl. Basically all the burrito contents in a bowl. Quick and gluten free.
They had a decent build-it burrito I could have, but it was just a bowl with lots of different ingredients, because the online menu didn't mention that I couldn't have the shell. Frankly, I was disappointed.