Wastewater Operator Practice Questions | Operator Master

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Free exam practice for wastewater treatment operators.

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Free Sample Questions by Topic

Approved Level I through IV wastewater operator practice questions, with the answer and an explanation for each.

Level 1 · Entry

Plant Operations53 questions
Math and Calculations10 questions
Pumps and Hydraulics8 questions
Secondary Clarification5 questions
Biological Treatment4 questions
Headworks and Screening4 questions
Grit Removal2 questions
Laboratory2 questions
Primary Treatment2 questions

Level 2 · Intermediate

Plant Operations35 questions
Math and Calculations21 questions
Pumps and Hydraulics18 questions
Biological Treatment11 questions
Laboratory9 questions
Disinfection7 questions
Solids Handling7 questions
Secondary Clarification5 questions
Primary Treatment3 questions
Grit Removal2 questions

Level 3 · Advanced

Math and Calculations40 questions
Plant Operations36 questions
Laboratory9 questions
Biological Treatment7 questions
Solids Handling6 questions
Disinfection5 questions
Safety5 questions
Primary Treatment4 questions
Pumps and Hydraulics4 questions

Level 4 · Expert

Plant Operations37 questions
Solids Handling11 questions
Biological Treatment9 questions
Disinfection9 questions
Laboratory9 questions
Secondary Clarification6 questions
Headworks and Screening5 questions
Math and Calculations5 questions
Pumps and Hydraulics5 questions
Safety4 questions
Primary Treatment3 questions
Grit Removal2 questions
Regulations and Compliance2 questions

All Sample Questions Wastewater Math Formulas