Who issues water and wastewater operator certifications in Ohio?

In Ohio, operator certifications are issued by Ohio Environmental Protection Agency (Ohio EPA).

Who administers the Ohio operator certification exam?

Ohio exams are administered by Association of Boards of Certification (ABC), administered for Ohio EPA.

How often do I have to renew my Ohio operator certification?

Ohio certifications renew on a 3 years cycle. Contact hours required per 3-year cycle, scaled by class (roughly 6–30 hours).

State certification hub

Ohio Water & Wastewater Operator Certification

Everything you need to get certified as an operator in Ohio — the certifying agency, exam logistics, grade levels, and renewal rules.

Photo: U.S. EPA (public domain)

Applied math is a significant part of the Ohio operator exam.

Practicing calculations like dosage, detention time, and loading before test day is one of the most effective ways to prepare, alongside reviewing your state’s official exam content outline.

Certification at a glance

Certifying agency	Ohio Environmental Protection Agency (Ohio EPA)
Exam administered by	Association of Boards of Certification (ABC), administered for Ohio EPA
Renewal cycle	3 years
Continuing education	Contact hours required per 3-year cycle, scaled by class (roughly 6–30 hours).
Official program	Visit the OH agency site →

How certification works in Ohio

Ohio EPA uses the ABC standardized exams and Roman-numeral classes (I–IV) across all disciplines, making it a clean match to the national 1–4 grade model.

Grade nomenclature in Ohio

How Ohio's levels map to the national Grade 1–4 model.

Discipline	Grade 1	Grade 2	Grade 3	Grade 4
Water Treatment	Class I	Class II	Class III	Class IV
Water Distribution	Class I	Class II	Class III	Class IV
Wastewater Treatment	Class I	Class II	Class III	Class IV
Collection Systems	Class I	Class II	Class III	Class IV

Certifications in Ohio

Water TreatmentCertification for operators who treat drinking water at surface or groundwater plants.Ohio treatment exam →

Water DistributionCertification for operators who maintain the pipes, pumps, and storage that deliver drinking water.Ohio distribution exam →

Wastewater TreatmentCertification for operators who treat municipal and industrial wastewater before discharge.Ohio wastewater exam →

Collection SystemsCertification for operators who maintain sewers and lift stations that convey wastewater.Ohio collection exam →

Frequently asked questions

Who issues water and wastewater operator certifications in Ohio?: In Ohio, operator certifications are issued by Ohio Environmental Protection Agency (Ohio EPA).
Who administers the Ohio operator certification exam?: Ohio exams are administered by Association of Boards of Certification (ABC), administered for Ohio EPA.
How often do I have to renew my Ohio operator certification?: Ohio certifications renew on a 3 years cycle. Contact hours required per 3-year cycle, scaled by class (roughly 6–30 hours).