There is a newer version of the Maryland Code
Maryland Environment Section 12-301
§ 12-301.
  (a)   Except as otherwise provided in this section, an individual shall be certified by the Board in an appropriate classification before a waterworks, wastewater works, or industrial wastewater works may employ the individual as:
    (1)   A superintendent; or
    (2)   An operator or industrial operator in a job function determined by the Secretary.
  (b)   This section does not prevent a governmental agency or a person from continuing to employ in a waterworks, wastewater works, or industrial wastewater works, until July 2, 1982, an operator or industrial operator who is not certified under this title.
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