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Certification Level
  
Certificate Duration
Limited (only available for operators working for a school water treatment plant or for a semipublic water supply; or for operators working for a school wastewater treatment plant and collection system.
12 hours
Certificates shall terminate if not renewed on or before Dec. 31 of the year the certification expired.
Class I and Class II
12 hours
Certificates shall terminate if not renewed on or before Dec. 31 of the year the certification expired.
Class III and Class IV
24 hours
Certificates shall terminate if not renewed on or before Dec. 31 of the year the certification expired.
Class I-OIT and Class II-OIT
12 hours
Certificates shall terminate if not renewed on or before June 30 of the year the certification expired.
Class III-OIT and Class IV-OIT
24 hours
Certificates shall terminate if not renewed on or before June 30 of the year the certification expired.