Michigan Water Treatment Operator
Level 2 Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
Pdf
1. A water supply receives source water from a moderately productive
aquifer with some potential for nuisance tastes and odors. Which of
the following treatment processes is most appropriate to address
these concerns?
A. Slow sand filtration
B. Activated carbon adsorption
C. Ion exchange softening
D. Reverse osmosis
Activated carbon adsorption is effective at removing nuisance tastes
and odors caused by organic compounds, making it suitable for
moderately productive aquifer sources with such issues.
2. The purpose of fluoride addition in a community water system is to:
A. Improve corrosion control
B. Reduce bacterial contamination
C. Prevent dental caries
D. Remove heavy metals
Fluoride is added at controlled levels to help prevent tooth decay
(dental caries) in the population served.
3. Coliform bacteria are used as an indicator organism because they:
A. Are nonpathogenic in all cases
B. Grow only in treated water
C. Indicate possible fecal contamination
, D. Produce toxins detectable by taste
Coliform bacteria serve as indicators of potential fecal contamination
and the possible presence of pathogens in water.
4. A jar test is performed to determine:
A. Disinfectant demand
B. Turbidity removal efficiency
C. Optimal coagulant dose
D. pH of source water
Jar tests help determine the most effective coagulant type and dose
to achieve turbidity removal under specific conditions.
5. In rapid mix treatment, the primary objective is to:
A. Provide flocculation time
B. Reduce chlorine demand
C. Disperse coagulant quickly and uniformly
D. Increase pH
Rapid mixing ensures the coagulant is quickly and uniformly
dispersed throughout the water for effective coagulation.
6. The breakpoint chlorination curve reveals that free chlorine residual
reappears when:
A. Combined chlorine increases
B. Chlorine demand decreases
C. All ammonia has been oxidized
D. pH falls below 6.5
Breakpoint chlorination occurs when enough chlorine has been
added to oxidize all ammonia and organic nitrogen compounds,
allowing free chlorine residual to form.
7. A turbidity of greater than 5 NTU in finished water indicates:
A. Adequate filtration
B. Proper disinfection
C. Potential treatment malfunction
D. Low coagulant dose
Finished water turbidity over 5 NTU suggests that filtration or
coagulation processes are not functioning properly.
8. Total organic carbon (TOC) in source water is most closely associated
with the formation of:
, A. Lead corrosion
B. Disinfection byproducts
C. Hardness scale
D. Alkalinity increase
TOC reacts with disinfectants such as chlorine to form disinfection
byproducts like trihalomethanes.
9. The most common pathogen of concern in surface water supplies
treated by conventional treatment is:
A. Escherichia coli
B. Legionella
C. Giardia lamblia
D. Staphylococcus aureus
Giardia lamblia, a protozoan parasite, is a common concern in
surface water and is controlled by effective filtration and
disinfection.
10. The primary purpose of a sedimentation basin is to:
A. Remove dissolved solids
B. Disinfect water
C. Settle heavier particles
D. Adjust pH
Sedimentation basins allow heavier suspended solids to settle out by
gravity before filtration.
11. A high alkalinity in source water generally indicates:
A. Low buffering capacity
B. Low pH stability
C. Good resistance to pH changes
D. High chlorine demand
High alkalinity provides buffering capacity, helping the water resist
changes in pH.
12. Corrosion control in distribution systems is primarily designed
to:
A. Increase water hardness
B. Enhance disinfectant taste
C. Minimize metal leaching
D. Reduce turbidity
Level 2 Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A water supply receives source water from a moderately productive
aquifer with some potential for nuisance tastes and odors. Which of
the following treatment processes is most appropriate to address
these concerns?
A. Slow sand filtration
B. Activated carbon adsorption
C. Ion exchange softening
D. Reverse osmosis
Activated carbon adsorption is effective at removing nuisance tastes
and odors caused by organic compounds, making it suitable for
moderately productive aquifer sources with such issues.
2. The purpose of fluoride addition in a community water system is to:
A. Improve corrosion control
B. Reduce bacterial contamination
C. Prevent dental caries
D. Remove heavy metals
Fluoride is added at controlled levels to help prevent tooth decay
(dental caries) in the population served.
3. Coliform bacteria are used as an indicator organism because they:
A. Are nonpathogenic in all cases
B. Grow only in treated water
C. Indicate possible fecal contamination
, D. Produce toxins detectable by taste
Coliform bacteria serve as indicators of potential fecal contamination
and the possible presence of pathogens in water.
4. A jar test is performed to determine:
A. Disinfectant demand
B. Turbidity removal efficiency
C. Optimal coagulant dose
D. pH of source water
Jar tests help determine the most effective coagulant type and dose
to achieve turbidity removal under specific conditions.
5. In rapid mix treatment, the primary objective is to:
A. Provide flocculation time
B. Reduce chlorine demand
C. Disperse coagulant quickly and uniformly
D. Increase pH
Rapid mixing ensures the coagulant is quickly and uniformly
dispersed throughout the water for effective coagulation.
6. The breakpoint chlorination curve reveals that free chlorine residual
reappears when:
A. Combined chlorine increases
B. Chlorine demand decreases
C. All ammonia has been oxidized
D. pH falls below 6.5
Breakpoint chlorination occurs when enough chlorine has been
added to oxidize all ammonia and organic nitrogen compounds,
allowing free chlorine residual to form.
7. A turbidity of greater than 5 NTU in finished water indicates:
A. Adequate filtration
B. Proper disinfection
C. Potential treatment malfunction
D. Low coagulant dose
Finished water turbidity over 5 NTU suggests that filtration or
coagulation processes are not functioning properly.
8. Total organic carbon (TOC) in source water is most closely associated
with the formation of:
, A. Lead corrosion
B. Disinfection byproducts
C. Hardness scale
D. Alkalinity increase
TOC reacts with disinfectants such as chlorine to form disinfection
byproducts like trihalomethanes.
9. The most common pathogen of concern in surface water supplies
treated by conventional treatment is:
A. Escherichia coli
B. Legionella
C. Giardia lamblia
D. Staphylococcus aureus
Giardia lamblia, a protozoan parasite, is a common concern in
surface water and is controlled by effective filtration and
disinfection.
10. The primary purpose of a sedimentation basin is to:
A. Remove dissolved solids
B. Disinfect water
C. Settle heavier particles
D. Adjust pH
Sedimentation basins allow heavier suspended solids to settle out by
gravity before filtration.
11. A high alkalinity in source water generally indicates:
A. Low buffering capacity
B. Low pH stability
C. Good resistance to pH changes
D. High chlorine demand
High alkalinity provides buffering capacity, helping the water resist
changes in pH.
12. Corrosion control in distribution systems is primarily designed
to:
A. Increase water hardness
B. Enhance disinfectant taste
C. Minimize metal leaching
D. Reduce turbidity
