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Exam information

Ohio EPA has two exam pathways to offer for obtaining certification. The traditional paper and pencil exam is given in Columbus twice a year. The third-party exam is offered year round at various locations in the state. The exam fact sheet provides a comparison of Ohio EPA’s traditional exam format to ABC’s Third-Party exam format.

For both exam pathways, Operator-in-Training (OIT) designation is available for Class A, I or II, should the applicant pass the exam. If designated as OIT, operating experience must be documented within four years of passing the exam. For more information, please go to the Operator tab and then click on the Operator-in-Training section.

For application instructions, please visit the Operator tab and click on the eBusiness Center section.

REQUIRED TRAINING: Starting Aug. 15, 2018, all applicants will need to review the Ohio EPA Professional Operator Certification Training document prior to submitting the Ohio EPA exam, third-party exam certification, reciprocity and renewal applications and Operator-in-Training forms.

Third-Party Exam Providers

As an alternative to Ohio EPA’s paper and pencil examination, Ohio EPA has approved the Water Professionals International (WPI), formerly the Association of Boards of Certification (ABC), as an approved examination provider. Operators may now choose to take WPI examinations and then seek Ohio certification for all levels of certification except Class IV.

Ensure you meet the requirements prior to taking the Class III exam. Operator-in-Training is not available at the Class III level.

Third-party exams can be taken in Ohio or any other location around the country. Ohio testing locations: Cleveland; Cincinnati; Columbus; Akron; Cambridge; Troy; and Toledo. Locations are subject to change, please click here to find current and out-of-state testing locations.

WPI/ABC Need To Know Criteria

Please note that the title on WPI’s Need to Know Criteria may be a different exam level than the Ohio EPA certification you are seeking. When you are applying through WPI’s provider, once you select Ohio EPA certification, you will select the Ohio EPA certificate level you are seeking and the appropriate WPI test is selected.

WPI/ABC Reference Material


Paper and Pencil Exam

Need-to-know Criteria

The following documents provide need-to know criteria that test-takers will be expected to know for each type of certified operator exam.

Formula Sheets

Reference Materials

Class IV

Training and Experience Credit

Exam Results

Date Results High Scorers Pass List
December 2022 View View View
December 2021 View View View
November 2019 View View View
May 2019 View View View
November 2018 View View View
May 2018 View View View
November 2017 View View View
May 2017 View View View
November 2016 View View View
May 2016 View View View
November 2015 View View View
May 2015 View View View
November 2014 View View View
May 2014 View View View
November 2013 View View View
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