WASTEWATER OPERATOR CLASS C TEST
BANK 2026 COMPLETE QUESTIONS AND
ANSWERS WITH ACCURATE SOLUTIONS
●● EPA.
Answer: Environmental Protection Agency is an agency of the federal
government of the United States charged with protecting human health
and the environment by writing and enforcing regulations based on laws
passed by Congress
●● NPDES.
Answer: National Pollutant Discharge Elimination System is a permit
issued by state or federal government regulating amount of pollutants
wastewater treatment plants can discharge
●● CFR.
Answer: Code of Federal Regulations is the codification of the general
and permanent rules and regulations published in the 'Federal Register'
by the executive departments and agencies (like EPA) of the Federal
Government of the United States
●● Wastewater.
Answer: The spent water of a community from homes, businesses, and
industries
,●● Domestic Wastewater.
Answer: Wastewater from homes and businesses with little to no
industrial components
●● Wastewater Physical Characteristics.
Answer: temperature, color (gray), odor (musty), turbidity
●● Sewer Use Ordinance.
Answer: Local ordinance that addresses what is prohibited from being
discharged and sets limits for particular pollutants
●● POTW.
Answer: Publicly Owned Treatment Works. A treatment works, as
defined by Section 212 of the CWA, that is owned by the state or
municipality. Includes the treatment plant and the collection system.
●● Industrial Pretreatment Program.
Answer: A program run by a permitting authority requiring industries to
pretreat wastes and establishing discharge limits for the water sent to the
POTW
●● Sanitary Sewer.
,Answer: Sewer system that transports spent water from homes, business,
and industries to the wastewater treatment plant
●● SSO.
Answer: Sanitary Sewer Overflow. Untreated of partiality treated
sewage overflows from a sanitary sewer collection system
●● Storm Sewer.
Answer: Sewer system that transports stormwater runoff to a water body
●● Combined Sewer System.
Answer: A sewer system that transports both sanitary sewage and
stormwater typically found in older municipalities
●● CSO.
Answer: Combined Sewer Overflow. A discharge of untreated
wastewater from a combined sewer system at a point prior to the
headworks of a POTW. CSOs generally occur during wet weather
(rainfall or snowmelt)
●● Sewer Main.
Answer: Pipe that collects the wastewater from the system laterals and
branch sewers and conveys it to larger trunk sewers
, ●● Trunk Sewers.
Answer: The main arteries of a collections system that convey water to
treatment plants or interceptors
●● Manhole.
Answer: Opening to a sewer line for the purpose of permitting operators
or equipment to enter or leave a sewer
●● Lift Station.
Answer: A wastewater pumping station that lifts the wastewater to a
higher elevation; usually the next gravity sewer or the treatment plant
●● The Collection System.
Answer: A network of pipes equipment, and appurtenances that collect,
pump, and transport wastewater to the wastewater treatment plant
●● Slope.
Answer: The ratio of the vertical distance over the horizontal distance.
Rise over run
●● Velocity.
Answer: Ratio of distance over time (miles per hour) Minimum 2 ft/sec
prevents solids from dropping out. Maximum 10 ft/sec because more
than that causes scouring
BANK 2026 COMPLETE QUESTIONS AND
ANSWERS WITH ACCURATE SOLUTIONS
●● EPA.
Answer: Environmental Protection Agency is an agency of the federal
government of the United States charged with protecting human health
and the environment by writing and enforcing regulations based on laws
passed by Congress
●● NPDES.
Answer: National Pollutant Discharge Elimination System is a permit
issued by state or federal government regulating amount of pollutants
wastewater treatment plants can discharge
●● CFR.
Answer: Code of Federal Regulations is the codification of the general
and permanent rules and regulations published in the 'Federal Register'
by the executive departments and agencies (like EPA) of the Federal
Government of the United States
●● Wastewater.
Answer: The spent water of a community from homes, businesses, and
industries
,●● Domestic Wastewater.
Answer: Wastewater from homes and businesses with little to no
industrial components
●● Wastewater Physical Characteristics.
Answer: temperature, color (gray), odor (musty), turbidity
●● Sewer Use Ordinance.
Answer: Local ordinance that addresses what is prohibited from being
discharged and sets limits for particular pollutants
●● POTW.
Answer: Publicly Owned Treatment Works. A treatment works, as
defined by Section 212 of the CWA, that is owned by the state or
municipality. Includes the treatment plant and the collection system.
●● Industrial Pretreatment Program.
Answer: A program run by a permitting authority requiring industries to
pretreat wastes and establishing discharge limits for the water sent to the
POTW
●● Sanitary Sewer.
,Answer: Sewer system that transports spent water from homes, business,
and industries to the wastewater treatment plant
●● SSO.
Answer: Sanitary Sewer Overflow. Untreated of partiality treated
sewage overflows from a sanitary sewer collection system
●● Storm Sewer.
Answer: Sewer system that transports stormwater runoff to a water body
●● Combined Sewer System.
Answer: A sewer system that transports both sanitary sewage and
stormwater typically found in older municipalities
●● CSO.
Answer: Combined Sewer Overflow. A discharge of untreated
wastewater from a combined sewer system at a point prior to the
headworks of a POTW. CSOs generally occur during wet weather
(rainfall or snowmelt)
●● Sewer Main.
Answer: Pipe that collects the wastewater from the system laterals and
branch sewers and conveys it to larger trunk sewers
, ●● Trunk Sewers.
Answer: The main arteries of a collections system that convey water to
treatment plants or interceptors
●● Manhole.
Answer: Opening to a sewer line for the purpose of permitting operators
or equipment to enter or leave a sewer
●● Lift Station.
Answer: A wastewater pumping station that lifts the wastewater to a
higher elevation; usually the next gravity sewer or the treatment plant
●● The Collection System.
Answer: A network of pipes equipment, and appurtenances that collect,
pump, and transport wastewater to the wastewater treatment plant
●● Slope.
Answer: The ratio of the vertical distance over the horizontal distance.
Rise over run
●● Velocity.
Answer: Ratio of distance over time (miles per hour) Minimum 2 ft/sec
prevents solids from dropping out. Maximum 10 ft/sec because more
than that causes scouring
