Wastewater Practice Test (Florida) English Latest
Update 2025-2026 195 Questions and 100%
Verified Correct Answers Guaranteed A+
A colored dye solution is added into the raw wastewater entering a primary settling tank.
The dye color was noticeable in the effluent in 15 minutes and all of the color had
passed through the tank in 40 minutes. What does this indicate? - CORRECT
ANSWER: Wastewater is passing through the tank too quickly for effective settling
A confined space is defined as having a space large enough to bodily enter and perform
work, has limited entry and egress and is ___________? - CORRECT ANSWER: Not
designed for continuous occupancy
A decrease in temperature will have what effect on disinfection? - CORRECT ANSWER:
Require longer contact time
A fire has started in the maintenance shop due to an ignition of petroleum oil. Which
type of fire extinguisher should NOT be used to fight the fire? - CORRECT ANSWER:
Pressurized water
A fixed sample is: - CORRECT ANSWER: A sample purposely spiked by the lab
technician for QA/QC
A good settling sludge would consist of what type of protozoa? - CORRECT ANSWER:
Free swimmers and stalk ciliates
A low F/M ratio, high MCRT, low SVI, and high MLSS concentrations are all
characteristic of? - CORRECT ANSWER: Old sludge
A plant with a flow of 1 MGD should be monitored - CORRECT ANSWER: Continuously
,A screenings dumpster at the head works of the treatment plant is full at the end of the
day. The dumpster is 6ft tall, 10ft long, and 8ft wide. How many cubic yards of
screenings must be disposed of in a 30 day month? - CORRECT ANSWER: 533 (6 x 10
x 8 = 480) (480 /27 = 17.7) (17.7 x 30 = 533)
A spray field has a total of 80 acres and is divided into four equal zones. Only one zone
may be operated at a time and the permit states that no more than 4 inches of water
can be applied to the zone. How long can a zone be operated at a rate of 0.7 MGD
before it must be rotated to another zone? - CORRECT ANSWER: 3.1 days
A waste treatment pond that is aerobic in the upper portion while the bottom layer is
anaerobic is called? - CORRECT ANSWER: Facultative pond
According to FAC chapter 62-600, Domestic wastewater facilities, your job as an
operator during major process breakdowns is to? - CORRECT ANSWER: Maintain
competent documentation and record keeping
According to FDEP chapter 62-60, FAC, a composite sample shall be used for which
test? - CORRECT ANSWER: Effluent CBOD
According to FDEP chapter 62-600.440 (4) (b) FAC, basic level disinfection is described
as: - CORRECT ANSWER: A chlorine residual of 0.5 mg/L for 15 minutes at peak hourly
flow
According to FDEP chapter 62-601 FAC, Domestic wastewater treatment plant
monitoring, discharge monitoring reports (DMRs) for the previous month must be
submitted to the department by the ____________ day of the current month? -
CORRECT ANSWER: 28th day
According to FDEP chapter 62-602 FAC, an operator could have his license
permanently revoked for: - CORRECT ANSWER: Falsified or misrepresented reports,
logs, or lab sheets
, According to FDEP chapter 62-602, drinking water and wastewater treatment plant
operators, duties of operators includes reporting to the permittee and the department,
as soon as possible, but within 24hrs: - CORRECT ANSWER: Any major interruption of
service
After removing the roof of the chlorinator storage building during the summer, the CL2
stops feeding. What is the cause? - CORRECT ANSWER: The tank got hotter than the
manifold
Amperometric titration is used to measure? - CORRECT ANSWER: Chlorine residual
An anaerobic digester that has become unstable is referred to as "stuck" or "sour". What
might cause this condition? - CORRECT ANSWER: High acid production, Sludge feed
rate too high, Improper Mixing
As an operator, how do you control the anaerobic digestion process? - CORRECT
ANSWER: Temperature and rate of raw sludge feed
As the operator of a primary clarifier, you notice a black and odorous septic wastewater
leaving the clarifier. What is the probable cause? - CORRECT ANSWER: Improper
sludge removal
At what pH would disinfection be at its greatest? - CORRECT ANSWER: 5
Cathodic protection is used for what purpose? - CORRECT ANSWER: The prevention
of corrosion to metals
Chapter 62-601, Domestic wastewater treatment plant monitoring, states that on-site
tests for total residual chlorine, pH, and _______ can be performed under the direction
of a certified operator: - CORRECT ANSWER: Dissolved Oxygen(DO)
Update 2025-2026 195 Questions and 100%
Verified Correct Answers Guaranteed A+
A colored dye solution is added into the raw wastewater entering a primary settling tank.
The dye color was noticeable in the effluent in 15 minutes and all of the color had
passed through the tank in 40 minutes. What does this indicate? - CORRECT
ANSWER: Wastewater is passing through the tank too quickly for effective settling
A confined space is defined as having a space large enough to bodily enter and perform
work, has limited entry and egress and is ___________? - CORRECT ANSWER: Not
designed for continuous occupancy
A decrease in temperature will have what effect on disinfection? - CORRECT ANSWER:
Require longer contact time
A fire has started in the maintenance shop due to an ignition of petroleum oil. Which
type of fire extinguisher should NOT be used to fight the fire? - CORRECT ANSWER:
Pressurized water
A fixed sample is: - CORRECT ANSWER: A sample purposely spiked by the lab
technician for QA/QC
A good settling sludge would consist of what type of protozoa? - CORRECT ANSWER:
Free swimmers and stalk ciliates
A low F/M ratio, high MCRT, low SVI, and high MLSS concentrations are all
characteristic of? - CORRECT ANSWER: Old sludge
A plant with a flow of 1 MGD should be monitored - CORRECT ANSWER: Continuously
,A screenings dumpster at the head works of the treatment plant is full at the end of the
day. The dumpster is 6ft tall, 10ft long, and 8ft wide. How many cubic yards of
screenings must be disposed of in a 30 day month? - CORRECT ANSWER: 533 (6 x 10
x 8 = 480) (480 /27 = 17.7) (17.7 x 30 = 533)
A spray field has a total of 80 acres and is divided into four equal zones. Only one zone
may be operated at a time and the permit states that no more than 4 inches of water
can be applied to the zone. How long can a zone be operated at a rate of 0.7 MGD
before it must be rotated to another zone? - CORRECT ANSWER: 3.1 days
A waste treatment pond that is aerobic in the upper portion while the bottom layer is
anaerobic is called? - CORRECT ANSWER: Facultative pond
According to FAC chapter 62-600, Domestic wastewater facilities, your job as an
operator during major process breakdowns is to? - CORRECT ANSWER: Maintain
competent documentation and record keeping
According to FDEP chapter 62-60, FAC, a composite sample shall be used for which
test? - CORRECT ANSWER: Effluent CBOD
According to FDEP chapter 62-600.440 (4) (b) FAC, basic level disinfection is described
as: - CORRECT ANSWER: A chlorine residual of 0.5 mg/L for 15 minutes at peak hourly
flow
According to FDEP chapter 62-601 FAC, Domestic wastewater treatment plant
monitoring, discharge monitoring reports (DMRs) for the previous month must be
submitted to the department by the ____________ day of the current month? -
CORRECT ANSWER: 28th day
According to FDEP chapter 62-602 FAC, an operator could have his license
permanently revoked for: - CORRECT ANSWER: Falsified or misrepresented reports,
logs, or lab sheets
, According to FDEP chapter 62-602, drinking water and wastewater treatment plant
operators, duties of operators includes reporting to the permittee and the department,
as soon as possible, but within 24hrs: - CORRECT ANSWER: Any major interruption of
service
After removing the roof of the chlorinator storage building during the summer, the CL2
stops feeding. What is the cause? - CORRECT ANSWER: The tank got hotter than the
manifold
Amperometric titration is used to measure? - CORRECT ANSWER: Chlorine residual
An anaerobic digester that has become unstable is referred to as "stuck" or "sour". What
might cause this condition? - CORRECT ANSWER: High acid production, Sludge feed
rate too high, Improper Mixing
As an operator, how do you control the anaerobic digestion process? - CORRECT
ANSWER: Temperature and rate of raw sludge feed
As the operator of a primary clarifier, you notice a black and odorous septic wastewater
leaving the clarifier. What is the probable cause? - CORRECT ANSWER: Improper
sludge removal
At what pH would disinfection be at its greatest? - CORRECT ANSWER: 5
Cathodic protection is used for what purpose? - CORRECT ANSWER: The prevention
of corrosion to metals
Chapter 62-601, Domestic wastewater treatment plant monitoring, states that on-site
tests for total residual chlorine, pH, and _______ can be performed under the direction
of a certified operator: - CORRECT ANSWER: Dissolved Oxygen(DO)
