The Drinking Water Treatment Plant Operator contains four classes of licensure. Treatment plant classes are A, B, C and D with class A being the highest. Licensure in Florida is a linear process in that an operator must obtain a lower level license prior to becoming eligible to receive a higher level license. For each level of licensure each applicant must also demonstrate the applicable number of years of experience. Licenses are issued for a two-year period with an expiration date of April 30 of every odd numbered year. In order for individuals to renew their license they must complete a specified amount of continuing education (CEU). Without the appropriate CEUs, the license will not be renewed.