All of Utz's manufacturing facilities are both peanut and tree nut free. ... (Utz brands include Bachman, Zappo, Dirty, and, of course, Utz. Zappo and Dirty do use peanut oil, but it's a highly-refined, processed peanut oil that doesn't have any peanut protein left in it, so it's supposedly safe for the peanut-allergic.