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Free Sample Questions by Topic

Operator-reviewed practice questions for Level I through IV wastewater operator exams, with the answer and an explanation for each.

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Level 1 · Entry

Plant Operations54 questions
Math and Calculations50 questions
Pumps and Hydraulics8 questions
Primary Treatment6 questions
Laboratory5 questions
Secondary Clarification5 questions
Biological Treatment4 questions
Disinfection4 questions
Grit Removal4 questions
Headworks and Screening4 questions
Regulations and Compliance2 questions
Solids Handling2 questions

Level 2 · Intermediate

Math and Calculations62 questions
Biological Treatment43 questions
Plant Operations41 questions
Pumps and Hydraulics17 questions
Disinfection10 questions
Laboratory10 questions
Primary Treatment8 questions
Secondary Clarification8 questions
Grit Removal4 questions
Headworks and Screening3 questions
Solids Handling3 questions
Regulations and Compliance2 questions

Level 3 · Advanced

Math and Calculations79 questions
Plant Operations41 questions
Biological Treatment13 questions
Laboratory10 questions
Solids Handling10 questions
Pumps and Hydraulics7 questions
Primary Treatment6 questions
Disinfection5 questions
Safety5 questions
Headworks and Screening3 questions
Grit Removal2 questions

Level 4 · Expert

Math and Calculations55 questions
Plant Operations49 questions
Solids Handling11 questions
Laboratory10 questions
Biological Treatment9 questions
Disinfection9 questions
Secondary Clarification6 questions
Headworks and Screening5 questions
Pumps and Hydraulics5 questions
Regulations and Compliance5 questions
Safety5 questions
Primary Treatment3 questions
Grit Removal2 questions

Wastewater Collections Practice Water Treatment Practice All Sample Questions Wastewater Math Formulas