Tequila is regulated by the Consejo Regulador del Tequila (CRT), a council that ensures high quality and consistency throughout the profession. According to the CRT, tequila has to be made from at least 51% blue agave, or agave tequilana, and must be produced in one of the five Mexican regions of Jalisco, Guanajuato, Nayarit, Tamaulipas, and Michoacan.