CWEA\Wastewater Operator Certification Study Guide-Grade 2
questions and answers 2026\2027 A+ Grade
General Wastewater Treatment:
What is the pressure head caused by?
- correct answer Water elevation
General Wastewater Treatment:
What color should the piping be that contains reclaimed water?
- correct answer purple
General Wastewater Treatment:
What is the term for the height to which a column of water will rise in a well.
- correct answer piezometric surface
General Wastewater Treatment:
In general, what is the maximum practical lift of pumps
- correct 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
- correct 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
- correct answer transducer
Wastewater Treatment Facilities:
The velocity in sanitary sewers is approximately:
- correct answer 2 ft/s
Wastewater Treatment Facilities:
The distance between manholes ranges from
- correct answer 300-500ft
Wastewater Treatment Facilities:
What should the flow velocity be through a grit channel
- correct 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
- correct answer remove some of the organic matter
Wastewater Treatment Facilities:
The most common flow-measure device for wastewater is a_____
- correct answer parshall flume
Wastewater Treatment Facilities:
The detention time for primary clarifiers usually has a range of_____hr/s
- correct 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
- correct answer activated sludge
Wastewater Treatment Facilities:
, Aerobic ponds usually range in depth from ___-____ft
- correct answer 3-6ft
Wastewater Treatment Facilities:
Anaerobic ponds usually range in depth from___-___ft
- correct answer 8-12ft
Wastewater Treatment Facilities:
Another name for a waste stabilization pond is
- correct answer raw wastewater lagoon
Wastewater sources & characteristics:
Typically what average percent of total solids in a domestic wastewater, both dissolved and suspended,
are inorganics
- correct answer 50%
Wastewater sources & characteristics:
Typically, what average percent of total solids in domestic wastewater, both dissolved and suspended,
are inorganics?
- correct answer 50%
Wastewater sources & characteristics:
Approx. what % of the dissolved solids in wastewater are inorganics
- correct answer 87%
Wastewater sources & characteristics:
questions and answers 2026\2027 A+ Grade
General Wastewater Treatment:
What is the pressure head caused by?
- correct answer Water elevation
General Wastewater Treatment:
What color should the piping be that contains reclaimed water?
- correct answer purple
General Wastewater Treatment:
What is the term for the height to which a column of water will rise in a well.
- correct answer piezometric surface
General Wastewater Treatment:
In general, what is the maximum practical lift of pumps
- correct 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
- correct 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
- correct answer transducer
Wastewater Treatment Facilities:
The velocity in sanitary sewers is approximately:
- correct answer 2 ft/s
Wastewater Treatment Facilities:
The distance between manholes ranges from
- correct answer 300-500ft
Wastewater Treatment Facilities:
What should the flow velocity be through a grit channel
- correct 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
- correct answer remove some of the organic matter
Wastewater Treatment Facilities:
The most common flow-measure device for wastewater is a_____
- correct answer parshall flume
Wastewater Treatment Facilities:
The detention time for primary clarifiers usually has a range of_____hr/s
- correct 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
- correct answer activated sludge
Wastewater Treatment Facilities:
, Aerobic ponds usually range in depth from ___-____ft
- correct answer 3-6ft
Wastewater Treatment Facilities:
Anaerobic ponds usually range in depth from___-___ft
- correct answer 8-12ft
Wastewater Treatment Facilities:
Another name for a waste stabilization pond is
- correct answer raw wastewater lagoon
Wastewater sources & characteristics:
Typically what average percent of total solids in a domestic wastewater, both dissolved and suspended,
are inorganics
- correct answer 50%
Wastewater sources & characteristics:
Typically, what average percent of total solids in domestic wastewater, both dissolved and suspended,
are inorganics?
- correct answer 50%
Wastewater sources & characteristics:
Approx. what % of the dissolved solids in wastewater are inorganics
- correct answer 87%
Wastewater sources & characteristics:
