WATER TREATMENT GRADE 2 NEWEST 2025 ACTUAL EXAM COMPLETE 230 QUESTIONS AND ANSWERS
Water being served to the public for a propulation greater than 3,300 must not have a disinfectant
residual entering the distribution system below ____________ for more than 4 hours - (answer) 0.2
mg/L
What is the action level for copper? - (answer) 1.3 mg/L
Where are the sampling points located for required sampling of coliform bacteria in a community water
system? - (answer) At points where water enters the distribution system, including all filter effluents of
surface water treatment plant
Under the Surface Water Treatment Rule, disinfection residuals must be collected at the same location in
the distribution system as? - (answer) coliform samples
What I the MCL for haloacetic acids (HAA5)? - (answer) 0.060 mg/L
An example of _______ is determining the lowest monthly average during 12 month monitoring of
Giardia and virus inactivation - (answer) benchmarking
What is the MCLG for substances that are suspected carcinogens? - (answer) zero
Which regulation is designed to limit huma exposure to harmful organisms, including Cryptosporidium,
by promoting achievement of particle and turbidity removal targets for surface water treatment
systems? - (answer) IESWTR
Which regulation is designed to limit human exposure to fecal contamination that may be present in
public water systems that use ground water sources? - (answer) GWR
Which regulation is designed to promote routine surveillance of distribution system water quality to
search for contamination from fecal matter and/or disease-causing bacteria? - (answer) TCR
what is the optmal pH range for the removal of particulate matter whe using alum as a coagulant? -
(answer) 6.5-7.2
,WATER TREATMENT GRADE 2 NEWEST 2025 ACTUAL EXAM COMPLETE 230 QUESTIONS AND ANSWERS
which forces will pull particles together once they have been destabilized in the coagulation-flocculation
process? - (answer) van der Waals forces
Which of the following is a common mistake that operators make in regard to flocculation units? -
(answer) Allowing excessive flocculation time
Ferric sulfate has which advantage over aluminum sulfate (alum)? - (answer) more dense floc
The lower the _________ the more difficult it is to form a proper floc. - (answer) turbidity
Jar test results are expressed in - (answer) milligrams per liter
List four characteristics of raw water that must be considered in selecting a treatment chemical? -
(answer) any four of the following: type and concentration of contaminants, temperature, alkalinity, pH,
turbidity, color, total organic carbon
Raw water temperature that approaches the freezing t has what effect on coagulation and flocculation
process? - (answer) as the water temperature decreases the viscosity of the water increases, which
slows the rate of floc settling
How much time is required to develop heavy floc particles during the flocculation process? - (answer)
30 minutes
if enteric disease-causing protozoans have been found in the effluent of a pater plant, which of the
following is the most probably solution? - (answer) use a multibarrier approach - coagulation,
flocculation, sedimentation, and filtration
What is the major cause of short-circuiting in a sedimentation basin? - (answer) poor inlet baffling
Conventional sedimentation has a _____________ removal of Cryptospoidium oocysts. - (answer) less
than 0.5-log
, WATER TREATMENT GRADE 2 NEWEST 2025 ACTUAL EXAM COMPLETE 230 QUESTIONS AND ANSWERS
dissolved-air flotation is particularly good for removing ______. - (answer) algae
as solids settle to the bottom of a sedimentation basin, the tank pressure is reduced. - (answer) a
sludge layer develops
What is the maximum weir loaing for light alum floc in solids-contact basins? - (answer) 10 gmp/ft
List four components of a typical rectangular sedimentation basin. - (answer) any four of the following:
sludge pipe, scum trough, flights, collector drive, baffle, effluent adjustable weirs
Which regulation basically requires that surface water systems maintain specified C x T values before the
treated water reaches the first customer? - (answer) SWTR
What is the primary test used to indicate proper sedimentation? - (answer) test for turbidity
Which type of sludge cannot be discharged to a sanitary sewer system because its deposits might build
up and block the sewers? - (answer) lime sludge
If filter run times between backwashes are long (e.g. 1 week) because the high-quality (low-turbidity)
water is being applied to the filters, which problem could still arise? - (answer) floc breakthrough
Gravel displacement in a filter bed from backwash rates with too high of a velocity could eventually
cause
a. compaction of the filter media.
b. loss of media into the backwash troughs.
c. a sand boil.
d. bed shrinkage. - (answer) sand boil
Which conventional treatment step is eliminated by direct filtration? - (answer) sedimentation
Water being served to the public for a propulation greater than 3,300 must not have a disinfectant
residual entering the distribution system below ____________ for more than 4 hours - (answer) 0.2
mg/L
What is the action level for copper? - (answer) 1.3 mg/L
Where are the sampling points located for required sampling of coliform bacteria in a community water
system? - (answer) At points where water enters the distribution system, including all filter effluents of
surface water treatment plant
Under the Surface Water Treatment Rule, disinfection residuals must be collected at the same location in
the distribution system as? - (answer) coliform samples
What I the MCL for haloacetic acids (HAA5)? - (answer) 0.060 mg/L
An example of _______ is determining the lowest monthly average during 12 month monitoring of
Giardia and virus inactivation - (answer) benchmarking
What is the MCLG for substances that are suspected carcinogens? - (answer) zero
Which regulation is designed to limit huma exposure to harmful organisms, including Cryptosporidium,
by promoting achievement of particle and turbidity removal targets for surface water treatment
systems? - (answer) IESWTR
Which regulation is designed to limit human exposure to fecal contamination that may be present in
public water systems that use ground water sources? - (answer) GWR
Which regulation is designed to promote routine surveillance of distribution system water quality to
search for contamination from fecal matter and/or disease-causing bacteria? - (answer) TCR
what is the optmal pH range for the removal of particulate matter whe using alum as a coagulant? -
(answer) 6.5-7.2
,WATER TREATMENT GRADE 2 NEWEST 2025 ACTUAL EXAM COMPLETE 230 QUESTIONS AND ANSWERS
which forces will pull particles together once they have been destabilized in the coagulation-flocculation
process? - (answer) van der Waals forces
Which of the following is a common mistake that operators make in regard to flocculation units? -
(answer) Allowing excessive flocculation time
Ferric sulfate has which advantage over aluminum sulfate (alum)? - (answer) more dense floc
The lower the _________ the more difficult it is to form a proper floc. - (answer) turbidity
Jar test results are expressed in - (answer) milligrams per liter
List four characteristics of raw water that must be considered in selecting a treatment chemical? -
(answer) any four of the following: type and concentration of contaminants, temperature, alkalinity, pH,
turbidity, color, total organic carbon
Raw water temperature that approaches the freezing t has what effect on coagulation and flocculation
process? - (answer) as the water temperature decreases the viscosity of the water increases, which
slows the rate of floc settling
How much time is required to develop heavy floc particles during the flocculation process? - (answer)
30 minutes
if enteric disease-causing protozoans have been found in the effluent of a pater plant, which of the
following is the most probably solution? - (answer) use a multibarrier approach - coagulation,
flocculation, sedimentation, and filtration
What is the major cause of short-circuiting in a sedimentation basin? - (answer) poor inlet baffling
Conventional sedimentation has a _____________ removal of Cryptospoidium oocysts. - (answer) less
than 0.5-log
, WATER TREATMENT GRADE 2 NEWEST 2025 ACTUAL EXAM COMPLETE 230 QUESTIONS AND ANSWERS
dissolved-air flotation is particularly good for removing ______. - (answer) algae
as solids settle to the bottom of a sedimentation basin, the tank pressure is reduced. - (answer) a
sludge layer develops
What is the maximum weir loaing for light alum floc in solids-contact basins? - (answer) 10 gmp/ft
List four components of a typical rectangular sedimentation basin. - (answer) any four of the following:
sludge pipe, scum trough, flights, collector drive, baffle, effluent adjustable weirs
Which regulation basically requires that surface water systems maintain specified C x T values before the
treated water reaches the first customer? - (answer) SWTR
What is the primary test used to indicate proper sedimentation? - (answer) test for turbidity
Which type of sludge cannot be discharged to a sanitary sewer system because its deposits might build
up and block the sewers? - (answer) lime sludge
If filter run times between backwashes are long (e.g. 1 week) because the high-quality (low-turbidity)
water is being applied to the filters, which problem could still arise? - (answer) floc breakthrough
Gravel displacement in a filter bed from backwash rates with too high of a velocity could eventually
cause
a. compaction of the filter media.
b. loss of media into the backwash troughs.
c. a sand boil.
d. bed shrinkage. - (answer) sand boil
Which conventional treatment step is eliminated by direct filtration? - (answer) sedimentation
