Basic Wastewater Operator Practice Exam Study Guide Questions And Answers 2025/ 2026 Water Treatment Certification Prep

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Basic Wastewater Operator Practice Exam Study Guide Questions And Answers 2025/ 2026 Water Treatment Certification Prep

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43 pages

2025/2026

Institution Basic Wastewater Operator

Course Basic Wastewater Operator

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Get Basic Wastewater Operator Practice Exam Study Guide Questions and Answers 2025/ 2026 with solution designed to help students and operators strengthen understanding of wastewater treatment processes, improve operational and safety knowledge, and achieve success in water systems certification and licensing exams.

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Basic Wastewater Operator PracticeBasic
ExamWastewater
Study Guide
Operator
Questions
Practice
andBasic
Answers.pdf
ExamWastewater
Study Guide
Operator
Questions
Practice
and Answers.pdf
Exam Study Guide Questions and Answers.pdf

Basic Wastewater
Operator Practice
Exam Study Guide
Questions and
Answers

Basic Wastewater Operator PracticeBasic
ExamWastewater
Study Guide
Operator
Questions
Practice
andBasic
Answers
ExamWastewater
Study Guide
Operator
Questions
Practice
and Answers.pdf
Exam Study Guide Questions and Answers.pdf

,Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf

What is the predominant organism in a healthy A. Stalked Ciliates
activated sludge treatment plant?

A. Stalked ciliates
B. rotifers
C. nematodes
D. amoebas

A composite sample must be? D. representative and sub-samples time spaced over 15 minutes apart

A. sporadically collected in the treatment plant
B. taken at one time
C. analyzed immediately
D. representative and sub-samples time spaced over
15 minutes apart

What is the standard volume for a BOD sample c. 300 mL
bottle?

A. 150 mL
B. 200 mL
C. 300 mL
D. 500 mL

Basic Wastewater Operator Practice Exam Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf

,Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf

If you have a lime slurry feed line, what is the best A. plug valve
valve to use?

A. plug valve
B. butterfly valve
C. RPZ dual check valve
D. gate valve

5. If you notice a predominance of rotifers in your C. old sludge
activated sludge sample while looking at it under a
microscope, what does this indicate?

A. healthy sludge
B. young sludge
C. old sludge
D. middle age sludge

Calculate the BOD using the given information: a. 360 mg/L
Initial DO: 8.3
Final DO: 5.9
Milliliters of sample used: 2

a. 360 mg/L
b. 210 mg/L
c. 856 mg/L
d. 36 mg/L

Basic Wastewater Operator Practice Exam Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf

, Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf

If your activated sludge plant begins to nitrify, what a. settling in the clarifiers
conditions would you expect to decrease?

A. settling in clarifiers
B. chlorine demand
C. BOD effluent
D. TSS in effluent

How do you calibrate a chemical feed pump? A. by measuring the pump output

A. by measuring the pump output
B. using the SWAG method
C. jar test
D. with a microscope

What is the chemical formula for sulfuric acid? d. H2SO4

a. HNO3
b. HCl
c. NaOH
d. H2SO4

Basic Wastewater Operator Practice Exam Basic Wastewater Operator Practice Exam.pdf Basic Wastewater Operator Practice Exam.pdf

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Uploaded on: May 27, 2026
Number of pages: 43
Written in: 2025/2026
Type: Exam (elaborations)
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