HAWAII Water Treatment Operator Practice
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. A common chemical added to boost alkalinity is?
A. Alum
B. Calcium Hydroxide
C. Copper Sulfate
D. Nitrites
B
2. Coagulation occurs during the first
A. 10-15 mins
B. 45-55 sec
C. 1 to 5 sec
D. 2-3 minutes
C
3. What does not pose a threat to human health in the drinking water?
A. Nitrates
B. Iron
C. THMs
D. All of the above
B
4. What will neutralize chlorine?
A. Calcium Carbonate
B. Chloramines
C. Sodium Thiosulfate
D. Ammonia Oxide
, C
5. Detention time in flocculation basins are usually designed to provide for?
A. 1-5 seconds
B. 15-45 seconds
C. 15-45 mins
D. 1-5 mins
C
6. What is the most troublesome operating problem for a sedimentation basin?
A. Short Circuiting
B. Sludge Collection Removal
C. Density Currents
D. Algae and Slime Growths
B
7. What test is used to determine the presence of coliform bacteria?
A. DPD
B. Physical
C. Presumptive
D. Multiple Choice
C
8. What is a similar process to reverse osmosis that uses lower pressures without
removing all mineral content?
A. Ninafiltration
B. Ninofiltratin
C. Nitrification
D. Nanofiltration
D
9. Every 0.1 mg/L of alum consumes what amount of alkalinity during the formation of
floc particles?
A. 0.5 mg/L
B. 1.0 mg/L
C. 2.0 mg/L
D. 2.5 mg/L
A
,10. Potassium Permanganate should be?
A. Frozen
B. Fed before chlorine
C. Heated
D. Used with powered activated carbon
B
11. What is the minimum angle that self cleaning tube settlers must be placed?
A. 10
B. 45
C. 50
D. 90
C
12. Under the Surface Water Treatment Rule a multiple barrier treatment consists of
A. Removal by filtration and inactivation by disinfection
B. Coagulation, Flocculation, Sedimentation
C. CT Value, Residual, Filter
D. Bar Screens, Filters, Ozone
A
13. An increase in filter media head loss could be an indicator of?
A. Carryover from the Sedimentation Basin
B. Filter is Ripening
C. Filter run is short
D. Flux Capacitor is clogged
A
14. For alum coagulation of color, what is the correct pH?
A. 0.0-3.0
B. 1.1-3.2
C. 4.0-6.0
D. 7.2-9.4
C
15. What is the principle form of alkalinity found in raw water from both surface and
ground sources?
A. Fluoride
, B. Alum
C. Calcium Bicarbonate
D. Hydrochloric Acid
C
16. The proper emergency kit for a chlorine tanker is?
A. Kit A
B. Kit B
C. Kit C
D. Kit from Knight Rider
C
17. CTs are based on?
A. Concentration of CL2 and Time
B. pH
C. Temperature
D. All of the above
D
18. Shellfish grown in polluted waters have been known to contain the organism that
causes infectious hepatitis.
True of False
True
19. What would be best to use for corrosion inhibition if the water is very low in alkalinity
and calcium concentration?
A. Chlorine
B. Chloramines
C. Sodium Hydroxide
D. Polyphosphates
D
Manganese is rarely found in surface waters above a concentration of?
A. 1.0 mg/L
B. 2.0 mg/L
C. 3.0 mg/L
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. A common chemical added to boost alkalinity is?
A. Alum
B. Calcium Hydroxide
C. Copper Sulfate
D. Nitrites
B
2. Coagulation occurs during the first
A. 10-15 mins
B. 45-55 sec
C. 1 to 5 sec
D. 2-3 minutes
C
3. What does not pose a threat to human health in the drinking water?
A. Nitrates
B. Iron
C. THMs
D. All of the above
B
4. What will neutralize chlorine?
A. Calcium Carbonate
B. Chloramines
C. Sodium Thiosulfate
D. Ammonia Oxide
, C
5. Detention time in flocculation basins are usually designed to provide for?
A. 1-5 seconds
B. 15-45 seconds
C. 15-45 mins
D. 1-5 mins
C
6. What is the most troublesome operating problem for a sedimentation basin?
A. Short Circuiting
B. Sludge Collection Removal
C. Density Currents
D. Algae and Slime Growths
B
7. What test is used to determine the presence of coliform bacteria?
A. DPD
B. Physical
C. Presumptive
D. Multiple Choice
C
8. What is a similar process to reverse osmosis that uses lower pressures without
removing all mineral content?
A. Ninafiltration
B. Ninofiltratin
C. Nitrification
D. Nanofiltration
D
9. Every 0.1 mg/L of alum consumes what amount of alkalinity during the formation of
floc particles?
A. 0.5 mg/L
B. 1.0 mg/L
C. 2.0 mg/L
D. 2.5 mg/L
A
,10. Potassium Permanganate should be?
A. Frozen
B. Fed before chlorine
C. Heated
D. Used with powered activated carbon
B
11. What is the minimum angle that self cleaning tube settlers must be placed?
A. 10
B. 45
C. 50
D. 90
C
12. Under the Surface Water Treatment Rule a multiple barrier treatment consists of
A. Removal by filtration and inactivation by disinfection
B. Coagulation, Flocculation, Sedimentation
C. CT Value, Residual, Filter
D. Bar Screens, Filters, Ozone
A
13. An increase in filter media head loss could be an indicator of?
A. Carryover from the Sedimentation Basin
B. Filter is Ripening
C. Filter run is short
D. Flux Capacitor is clogged
A
14. For alum coagulation of color, what is the correct pH?
A. 0.0-3.0
B. 1.1-3.2
C. 4.0-6.0
D. 7.2-9.4
C
15. What is the principle form of alkalinity found in raw water from both surface and
ground sources?
A. Fluoride
, B. Alum
C. Calcium Bicarbonate
D. Hydrochloric Acid
C
16. The proper emergency kit for a chlorine tanker is?
A. Kit A
B. Kit B
C. Kit C
D. Kit from Knight Rider
C
17. CTs are based on?
A. Concentration of CL2 and Time
B. pH
C. Temperature
D. All of the above
D
18. Shellfish grown in polluted waters have been known to contain the organism that
causes infectious hepatitis.
True of False
True
19. What would be best to use for corrosion inhibition if the water is very low in alkalinity
and calcium concentration?
A. Chlorine
B. Chloramines
C. Sodium Hydroxide
D. Polyphosphates
D
Manganese is rarely found in surface waters above a concentration of?
A. 1.0 mg/L
B. 2.0 mg/L
C. 3.0 mg/L
