OR Water Wastewater Operator Practice Questions - Oregon Water And Wastewater Operator Certification Exam

What are the certification grades for Oregon wastewater treatment system operators under OAR 340-049?

Classes A, B, C, and D Grades I, II, III, and IV Levels 1-5 Tiers Basic, Intermediate, and Advanced

Correct Answer:

Grades I, II, III, and IV

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