WASTEWATER OPERATOR CERTIFICATION
EXAM SCRIPT 2026 COMPLETE QUESTIONS
AND SOLUTIONS 100% CORRECT
◉ General Wastewater Treatment:
What color should the piping be that contains reclaimed water? Answer:
purple
◉ General Wastewater Treatment:
What is the term for the height to which a column of water will rise in a
well. Answer: piezometric surface
◉ General Wastewater Treatment:
In general, what is the maximum practical lift of pumps Answer: 15-25ft
◉ General Wastewater Treatment:
,Which one of the following valves is the best to use in throttling a flow
situation?
a. gate
b. butterfly
c. globe
d. ball Answer: globe
◉ General Wastewater Treatment:
Which one of the following devices is used to measure water depths in
storage facilities?
a. transducer
b. Venturi meter
c. magnetic sensor
d. thermistor Answer: transducer
◉ Wastewater Treatment Facilities:
The velocity in sanitary sewers is approximately: Answer: 2 ft/s
◉ Wastewater Treatment Facilities:
,The distance between manholes ranges from Answer: 300-500ft
◉ Wastewater Treatment Facilities:
What should the flow velocity be through a grit channel Answer: 1.0 ft/s
◉ Wastewater Treatment Facilities:
Grit washers are used to______
a. remove some of the organic matter
b. remove large pieces of wood
c. remove rags and eggshells
d. remove the odors Answer: remove some of the organic matter
◉ Wastewater Treatment Facilities:
The most common flow-measure device for wastewater is a_____
Answer: parshall flume
◉ Wastewater Treatment Facilities:
, The detention time for primary clarifiers usually has a range of_____hr/s
Answer: 1.5-2hr
◉ Wastewater Treatment Facilities:
The effluent from which process is called mixed liquor
a.secondary clarification
b. primary clarification
c. sludge drying bed or pond
d. activated sludge Answer: activated sludge
◉ Wastewater Treatment Facilities:
Aerobic ponds usually range in depth from ___-____ft Answer: 3-6ft
◉ Wastewater Treatment Facilities:
Anaerobic ponds usually range in depth from___-___ft Answer: 8-12ft
◉ Wastewater Treatment Facilities:
EXAM SCRIPT 2026 COMPLETE QUESTIONS
AND SOLUTIONS 100% CORRECT
◉ General Wastewater Treatment:
What color should the piping be that contains reclaimed water? Answer:
purple
◉ General Wastewater Treatment:
What is the term for the height to which a column of water will rise in a
well. Answer: piezometric surface
◉ General Wastewater Treatment:
In general, what is the maximum practical lift of pumps Answer: 15-25ft
◉ General Wastewater Treatment:
,Which one of the following valves is the best to use in throttling a flow
situation?
a. gate
b. butterfly
c. globe
d. ball Answer: globe
◉ General Wastewater Treatment:
Which one of the following devices is used to measure water depths in
storage facilities?
a. transducer
b. Venturi meter
c. magnetic sensor
d. thermistor Answer: transducer
◉ Wastewater Treatment Facilities:
The velocity in sanitary sewers is approximately: Answer: 2 ft/s
◉ Wastewater Treatment Facilities:
,The distance between manholes ranges from Answer: 300-500ft
◉ Wastewater Treatment Facilities:
What should the flow velocity be through a grit channel Answer: 1.0 ft/s
◉ Wastewater Treatment Facilities:
Grit washers are used to______
a. remove some of the organic matter
b. remove large pieces of wood
c. remove rags and eggshells
d. remove the odors Answer: remove some of the organic matter
◉ Wastewater Treatment Facilities:
The most common flow-measure device for wastewater is a_____
Answer: parshall flume
◉ Wastewater Treatment Facilities:
, The detention time for primary clarifiers usually has a range of_____hr/s
Answer: 1.5-2hr
◉ Wastewater Treatment Facilities:
The effluent from which process is called mixed liquor
a.secondary clarification
b. primary clarification
c. sludge drying bed or pond
d. activated sludge Answer: activated sludge
◉ Wastewater Treatment Facilities:
Aerobic ponds usually range in depth from ___-____ft Answer: 3-6ft
◉ Wastewater Treatment Facilities:
Anaerobic ponds usually range in depth from___-___ft Answer: 8-12ft
◉ Wastewater Treatment Facilities:
