AWWA WATER REUSE OPERATOR CERTFICATION
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2026 |INSTANT
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1. What is the primary purpose of water reuse in utility
operations?
A. Increase water hardness
B. Reduce potable water demand
C. Increase chemical usage
D. Eliminate all treatment processes
Rationale: Water reuse reduces pressure on freshwater sources
by recycling treated wastewater for beneficial uses.
Correct answer: B. Reduce potable water demand
2. Which process is most commonly used for disinfection in
water reuse systems?
A. Sedimentation
B. Chlorination
C. Screening
D. Aeration
,Rationale: Chlorination is widely used to kill pathogens in
reclaimed water.
Correct answer: B. Chlorination
3. What does “non-potable reuse” mean?
A. Water safe for drinking
B. Water reused without treatment
C. Water not intended for drinking
D. Water used only in hospitals
Rationale: Non-potable reuse refers to treated water used for
irrigation, industrial, or other non-drinking purposes.
Correct answer: C. Water not intended for drinking
4. Which parameter is most important in monitoring
reclaimed water safety?
A. Turbidity
B. Color
C. Taste
D. Odor only
Rationale: Turbidity indicates suspended particles that may
harbor pathogens.
Correct answer: A. Turbidity
,5. What is the main purpose of filtration in water reuse
treatment?
A. Increase pH
B. Remove suspended solids
C. Add oxygen
D. Increase hardness
Rationale: Filtration removes fine particles and improves water
clarity.
Correct answer: B. Remove suspended solids
6. Which microorganism is commonly used as an indicator of
fecal contamination?
A. Algae
B. E. coli
C. Protozoa
D. Virus particles only
Rationale: E. coli presence indicates possible fecal
contamination.
Correct answer: B. E. coli
7. What is the purpose of secondary treatment in wastewater
reuse?
A. Remove large debris
B. Remove dissolved and suspended organic matter
, C. Add disinfectant
D. Increase salinity
Rationale: Secondary treatment uses biological processes to
reduce organic load.
Correct answer: B. Remove dissolved and suspended organic
matter
8. Which chemical is commonly used for pH adjustment in
reuse systems?
A. Sodium hydroxide
B. Oxygen
C. Nitrogen
D. Chloride gas only
Rationale: Sodium hydroxide is used to raise pH levels.
Correct answer: A. Sodium hydroxide
9. What is the function of a clarifier in water reuse treatment?
A. Add chemicals
B. Remove solids by settling
C. Increase flow velocity
D. Heat water
Rationale: Clarifiers allow solids to settle out of water by
gravity.
Correct answer: B. Remove solids by settling
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2026 |INSTANT
DOWNLOAD PDF
1. What is the primary purpose of water reuse in utility
operations?
A. Increase water hardness
B. Reduce potable water demand
C. Increase chemical usage
D. Eliminate all treatment processes
Rationale: Water reuse reduces pressure on freshwater sources
by recycling treated wastewater for beneficial uses.
Correct answer: B. Reduce potable water demand
2. Which process is most commonly used for disinfection in
water reuse systems?
A. Sedimentation
B. Chlorination
C. Screening
D. Aeration
,Rationale: Chlorination is widely used to kill pathogens in
reclaimed water.
Correct answer: B. Chlorination
3. What does “non-potable reuse” mean?
A. Water safe for drinking
B. Water reused without treatment
C. Water not intended for drinking
D. Water used only in hospitals
Rationale: Non-potable reuse refers to treated water used for
irrigation, industrial, or other non-drinking purposes.
Correct answer: C. Water not intended for drinking
4. Which parameter is most important in monitoring
reclaimed water safety?
A. Turbidity
B. Color
C. Taste
D. Odor only
Rationale: Turbidity indicates suspended particles that may
harbor pathogens.
Correct answer: A. Turbidity
,5. What is the main purpose of filtration in water reuse
treatment?
A. Increase pH
B. Remove suspended solids
C. Add oxygen
D. Increase hardness
Rationale: Filtration removes fine particles and improves water
clarity.
Correct answer: B. Remove suspended solids
6. Which microorganism is commonly used as an indicator of
fecal contamination?
A. Algae
B. E. coli
C. Protozoa
D. Virus particles only
Rationale: E. coli presence indicates possible fecal
contamination.
Correct answer: B. E. coli
7. What is the purpose of secondary treatment in wastewater
reuse?
A. Remove large debris
B. Remove dissolved and suspended organic matter
, C. Add disinfectant
D. Increase salinity
Rationale: Secondary treatment uses biological processes to
reduce organic load.
Correct answer: B. Remove dissolved and suspended organic
matter
8. Which chemical is commonly used for pH adjustment in
reuse systems?
A. Sodium hydroxide
B. Oxygen
C. Nitrogen
D. Chloride gas only
Rationale: Sodium hydroxide is used to raise pH levels.
Correct answer: A. Sodium hydroxide
9. What is the function of a clarifier in water reuse treatment?
A. Add chemicals
B. Remove solids by settling
C. Increase flow velocity
D. Heat water
Rationale: Clarifiers allow solids to settle out of water by
gravity.
Correct answer: B. Remove solids by settling
