South Carolina Physical/Chemical Wastewater Operator
Class C Exam Practice Questions and correct Answers
[Verified Answers] Plus Rationales Latest 2026/27
Always _____ a piece of equipment before attempting a repair - correct answers Lockout/Tagout
Before entering a confined space, you should check for oxygen levels no less than _ or greater
than _. - correct answers 19.5% & 23.5%
The greatest hazard with the generation and handling of carbon dioxide is __. - correct answers
Asphyxiation
The most hazardous condition associated with storage areas, slurry tanks, or other confined
spaces where activated carbon is present is ---- - correct answers Depletion of oxygen
Ventilation or a blower should be placed at least __ feet from manhole and at a ___ angle to the
wind direction to allow communication and prevent contaminants entering the manhole -
correct answers 6 feet, right angle
___and ___ should be located in an easily accessible place known to all employees - correct
answers Fire extinguishers, first aid kits
A pipet with TD printed on it means ''____" - correct answers To deliver
The jar test is used to establish optimum dosage in the ___ process - correct answers
coagulation/flocculation
Three waterborne diseases are ____ - correct answers typhoid fever, dysentery and cholera
,____ are the most frequent injuries occurring in water operations - correct answers Strains and
Sprains
Methane gas is dangerous because it is ____ - correct answers explosive
___ amperes of electricity is sufficient to injure or kill a person - correct answers 1/3 amps
The most reliable backflow preventor is the ___ - correct answers Air Gap
The ____ device is the most reliable backflow if an air gap is not in
place - correct answers RP (Reduced Pressure)
Public health is the primary concern regarding ___ - correct answers effluent disposal
First aid for first degree bums would be to ____ - correct answers immediately submerge burn
in cold water
The purpose of a backflow preventer is to ___ - correct answers prevent contamination of a
water supply
___ is very effective in cleaning up a polymer spill - correct answers Salt
An example of a Class A fire would be: - correct answers wood burning
An example of a Class B fire would be: - correct answers Chemical Burning
, An example of a Class C fire would be: - correct answers Electrical Fire
An example of a Class D fire would be: - correct answers Flammable Metals
Slipping is a hazard associated with a ___ spill - correct answers polymer
The problems encountered while working around chlorine is that chlorine is ___ - correct
answers very corrosive, toxic and aggressive
Always store incompatible chemicals ___. - correct answers apart from each other
Flush eyes or skin for at least ___ if chlorine gets in your eyes or on your skin - correct answers
15 minutes
___ hours of continuing education is required every two years to maintain a certification -
correct answers 12 hours
___ is the agency responsible for enforcement of regulations for water plants in the State of SC -
correct answers SCDHEC
The Municipality issues ____ for industries that discharge to a treatment plant - correct answers
pretreatment permits
The____ can revoke or suspend an operators certification for certain infractions of the
regulations - correct answers ECB (Environmental Control Board)
Use the facility ___ to troubleshoot operational problems at the treatment plant - correct
answers O & M manual
Class C Exam Practice Questions and correct Answers
[Verified Answers] Plus Rationales Latest 2026/27
Always _____ a piece of equipment before attempting a repair - correct answers Lockout/Tagout
Before entering a confined space, you should check for oxygen levels no less than _ or greater
than _. - correct answers 19.5% & 23.5%
The greatest hazard with the generation and handling of carbon dioxide is __. - correct answers
Asphyxiation
The most hazardous condition associated with storage areas, slurry tanks, or other confined
spaces where activated carbon is present is ---- - correct answers Depletion of oxygen
Ventilation or a blower should be placed at least __ feet from manhole and at a ___ angle to the
wind direction to allow communication and prevent contaminants entering the manhole -
correct answers 6 feet, right angle
___and ___ should be located in an easily accessible place known to all employees - correct
answers Fire extinguishers, first aid kits
A pipet with TD printed on it means ''____" - correct answers To deliver
The jar test is used to establish optimum dosage in the ___ process - correct answers
coagulation/flocculation
Three waterborne diseases are ____ - correct answers typhoid fever, dysentery and cholera
,____ are the most frequent injuries occurring in water operations - correct answers Strains and
Sprains
Methane gas is dangerous because it is ____ - correct answers explosive
___ amperes of electricity is sufficient to injure or kill a person - correct answers 1/3 amps
The most reliable backflow preventor is the ___ - correct answers Air Gap
The ____ device is the most reliable backflow if an air gap is not in
place - correct answers RP (Reduced Pressure)
Public health is the primary concern regarding ___ - correct answers effluent disposal
First aid for first degree bums would be to ____ - correct answers immediately submerge burn
in cold water
The purpose of a backflow preventer is to ___ - correct answers prevent contamination of a
water supply
___ is very effective in cleaning up a polymer spill - correct answers Salt
An example of a Class A fire would be: - correct answers wood burning
An example of a Class B fire would be: - correct answers Chemical Burning
, An example of a Class C fire would be: - correct answers Electrical Fire
An example of a Class D fire would be: - correct answers Flammable Metals
Slipping is a hazard associated with a ___ spill - correct answers polymer
The problems encountered while working around chlorine is that chlorine is ___ - correct
answers very corrosive, toxic and aggressive
Always store incompatible chemicals ___. - correct answers apart from each other
Flush eyes or skin for at least ___ if chlorine gets in your eyes or on your skin - correct answers
15 minutes
___ hours of continuing education is required every two years to maintain a certification -
correct answers 12 hours
___ is the agency responsible for enforcement of regulations for water plants in the State of SC -
correct answers SCDHEC
The Municipality issues ____ for industries that discharge to a treatment plant - correct answers
pretreatment permits
The____ can revoke or suspend an operators certification for certain infractions of the
regulations - correct answers ECB (Environmental Control Board)
Use the facility ___ to troubleshoot operational problems at the treatment plant - correct
answers O & M manual
