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State-Specific RegulationsBeginner 15 min read

Ohio Water Treatment Operator Certification: Program Structure & Lake Erie Water Quality

An overview of Ohio's professional operator certification structure for water supply systems and the state's unique Lake Erie harmful algal bloom challenge.

Ohio Water Treatment Operator Certification: Program Structure & Lake Erie Water Quality
Certification Structure
Ohio EPA's Division of Drinking and Ground Waters administers professional operator certification under Ohio Administrative Code (OAC) Chapter 3745-7. Water supply operators are certified into five classes, from entry-level to most complex:
  • Class A — entry-level; 1,040 hours of operating experience or 3 years of qualifying work experience
  • Class I — small/simple systems
  • Class II — moderate complexity systems
  • Class III — larger, more complex treatment facilities
  • Class IV — the most complex treatment plants in the state
Ohio's certification classes are cumulative: a person holding a higher class certificate (e.g. Class III) is automatically qualified to serve as operator of record for any lower class (Class II, Class I, Class A) within t

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