CWEA Collection Systems Maintenance Midterm
Exam Questions and Answers 2026
Primary purpose of a wastewater collection system - ANSWERTo transport
wastewater from its source to a treatment facility.
Commonly used pipe for gravity sewer systems - ANSWERPVC (Polyvinyl
Chloride).
Function of a manhole in a collection system - ANSWERTo provide access for
inspection and maintenance.
Common cause of sewer blockages - ANSWERGrease buildup.
Required personal protective equipment (PPE) for confined space entry -
ANSWERHard hat, gloves, eye protection, and a gas monitor.
Infiltration in a sewer system - ANSWERGroundwater entering the system
through defects.
I&I in wastewater collection - ANSWERInfiltration and Inflow.
How flow is typically measured in a sewer pipe - ANSWERUsing a flow meter.
, Main purpose of a lift station - ANSWERTo pump wastewater to a higher
elevation.
Safe oxygen level for confined space entry - ANSWER19.5% to 23.5%.
Tool used to clear tree roots from sewer lines - ANSWERMechanical rodding
machine.
What to do before entering a manhole - ANSWERTest the atmosphere for
toxic and flammable gases.
Force main - ANSWERA pressurized pipe that conveys wastewater from a
pump.
Symptom of sewer gas exposure - ANSWERHeadaches and dizziness.
Type of maintenance that removes grease and sediment buildup -
ANSWERHydrojetting or high-pressure cleaning.
Common sign of a failing sewer lateral - ANSWERFrequent backups or slow
drainage.
SCADA - ANSWERSupervisory Control and Data Acquisition.
Frequency of sewer line inspections - ANSWERAnnually or based on system
criticality.
Exam Questions and Answers 2026
Primary purpose of a wastewater collection system - ANSWERTo transport
wastewater from its source to a treatment facility.
Commonly used pipe for gravity sewer systems - ANSWERPVC (Polyvinyl
Chloride).
Function of a manhole in a collection system - ANSWERTo provide access for
inspection and maintenance.
Common cause of sewer blockages - ANSWERGrease buildup.
Required personal protective equipment (PPE) for confined space entry -
ANSWERHard hat, gloves, eye protection, and a gas monitor.
Infiltration in a sewer system - ANSWERGroundwater entering the system
through defects.
I&I in wastewater collection - ANSWERInfiltration and Inflow.
How flow is typically measured in a sewer pipe - ANSWERUsing a flow meter.
, Main purpose of a lift station - ANSWERTo pump wastewater to a higher
elevation.
Safe oxygen level for confined space entry - ANSWER19.5% to 23.5%.
Tool used to clear tree roots from sewer lines - ANSWERMechanical rodding
machine.
What to do before entering a manhole - ANSWERTest the atmosphere for
toxic and flammable gases.
Force main - ANSWERA pressurized pipe that conveys wastewater from a
pump.
Symptom of sewer gas exposure - ANSWERHeadaches and dizziness.
Type of maintenance that removes grease and sediment buildup -
ANSWERHydrojetting or high-pressure cleaning.
Common sign of a failing sewer lateral - ANSWERFrequent backups or slow
drainage.
SCADA - ANSWERSupervisory Control and Data Acquisition.
Frequency of sewer line inspections - ANSWERAnnually or based on system
criticality.
