legal requirements legal requirements http://ttb.gov/kombucha/kombucha-general.shtml trace amounts of alcohol http://ttb.gov/kombucha/kombucha-general.shtml http://ttb.gov/kombucha/kombucha-general.shtml TTB FAQ on Kombucha Tea http://ttb.gov/kombucha/kombucha-general.shtml .5% ABV or more is legally considered alcohol .5% ABV or more is legally considered alcohol Alcohol and Tobacco Tax and Trade Bureau do more research TTB