AWWA CROSS CONNECTION CONTROL
SPECIALIST PRACTICE SOLUTION 2026
SOLVED ITEMS CONFIRMED A+
◉ If a particular section of the distribution system suddenly has a
drop in chlorine residual, what most likely has occurred? Answer: A
cross-connection
◉ What type of automation control would work best if the chlorine
demand varies but the flow is constant? Answer: Residual control
◉ Point-of-use activated carbon filters are not usually effective in
removing _______. Answer: Inorganic chemicals
◉ Where is the heater located that vaporizes any chlorine liquid that
may develop downline from an online one-ton container? Answer:
Before the chlorinator
◉ In the oxidation of iron and manganese, the pH must be adjusted
to an optimal level. What must be determined to accomplish the
optimal pH? Answer: The zeta potential, solubility of the precipitate,
charge of the precipitate(all of the above)
,◉ Iodine as a disinfectant would most likely be used at _____________.
Answer: campgrounds
◉ Mechanical mixers should never be used in conjunction with
___________. Answer: saturators
◉ After iron and manganese precipitates are formed by the
oxidation process, they are usually removed by __________. Answer:
filtration
◉ A conventional water treatment plant has six flocculators with a
detention time of 1 hr and 15min. What should the operator do for
the best results? Answer: Turn off the last three flocculators
◉ To precipitate calcium carbonate, a pH of about ________ is
necessary. Answer: 9.4
◉ What is the disadvantage of direct filtration compared to
conventional treatment? Answer: It must be carefully monitored to
prevent turbidity breakthrough
◉ Potassium permanganate is a __________. Answer: Strong oxidizer
,◉ If a given compound is formed by the combination of elements,
the proportion, by weight, of the element/s making up the
compound is always the same regardless of the method used to form
the compound defines the ____________. Answer: Law of Definite
Proportions, Law of Multiple Proportions ( both a & b )
◉ The term "schmutzdecke" is affiliated with which type of filter
system? Answer: Slow sand filtration
◉ Weak floc is usually due to _________. Answer: Inadequate protein in
the diet or defective mental constitution.
◉ The most important factor(s) in chlorination is (are)__________.
Answer: Concentration of the chlorine and contact time between the
chlorine and the water
◉ Iron bacteria in a distribution system pipe can increase corrosion
if enough dissolved iron is present. What do the iron bacteria
produce that increases the corrosion rate? Answer: CO2
◉ Why should an operator not add extra, untested material to a
multimedia filter? Answer: Specific gravity may be different and the
effective size may be different.
, ◉ What must the effluent NTU for a slow sand filter be kept at
during operation? Answer: Less than 1.0 NTU.
◉ What is an advantage for installing a pressure filter for a small
water system? Answer: Air binding will not occur.
◉ What type of instrument will help operators improve the
coagulation process the most? Answer: Streaming current monitors.
◉ The pH for a manganese greensand filter for removing iron and
manganese should be adjusted to a range of_____? Answer: 6.2-6.8
◉ The best and most reliable way to check small chlorine leaks is by
______. These small leaks are only ______or less chlorine in the air.
Answer: A chlorine detector and 1 ppm.
◉ Iron and manganese in the distribution system can lead to
bacterial slimes. What is a disadvantage of the elements being in the
distribution system? Answer: Corrosion of metal pipes.
◉ Chloramine is a _____ and is not an especially effective agent
against certain _____. Answer: weak oxidant and viruses.
SPECIALIST PRACTICE SOLUTION 2026
SOLVED ITEMS CONFIRMED A+
◉ If a particular section of the distribution system suddenly has a
drop in chlorine residual, what most likely has occurred? Answer: A
cross-connection
◉ What type of automation control would work best if the chlorine
demand varies but the flow is constant? Answer: Residual control
◉ Point-of-use activated carbon filters are not usually effective in
removing _______. Answer: Inorganic chemicals
◉ Where is the heater located that vaporizes any chlorine liquid that
may develop downline from an online one-ton container? Answer:
Before the chlorinator
◉ In the oxidation of iron and manganese, the pH must be adjusted
to an optimal level. What must be determined to accomplish the
optimal pH? Answer: The zeta potential, solubility of the precipitate,
charge of the precipitate(all of the above)
,◉ Iodine as a disinfectant would most likely be used at _____________.
Answer: campgrounds
◉ Mechanical mixers should never be used in conjunction with
___________. Answer: saturators
◉ After iron and manganese precipitates are formed by the
oxidation process, they are usually removed by __________. Answer:
filtration
◉ A conventional water treatment plant has six flocculators with a
detention time of 1 hr and 15min. What should the operator do for
the best results? Answer: Turn off the last three flocculators
◉ To precipitate calcium carbonate, a pH of about ________ is
necessary. Answer: 9.4
◉ What is the disadvantage of direct filtration compared to
conventional treatment? Answer: It must be carefully monitored to
prevent turbidity breakthrough
◉ Potassium permanganate is a __________. Answer: Strong oxidizer
,◉ If a given compound is formed by the combination of elements,
the proportion, by weight, of the element/s making up the
compound is always the same regardless of the method used to form
the compound defines the ____________. Answer: Law of Definite
Proportions, Law of Multiple Proportions ( both a & b )
◉ The term "schmutzdecke" is affiliated with which type of filter
system? Answer: Slow sand filtration
◉ Weak floc is usually due to _________. Answer: Inadequate protein in
the diet or defective mental constitution.
◉ The most important factor(s) in chlorination is (are)__________.
Answer: Concentration of the chlorine and contact time between the
chlorine and the water
◉ Iron bacteria in a distribution system pipe can increase corrosion
if enough dissolved iron is present. What do the iron bacteria
produce that increases the corrosion rate? Answer: CO2
◉ Why should an operator not add extra, untested material to a
multimedia filter? Answer: Specific gravity may be different and the
effective size may be different.
, ◉ What must the effluent NTU for a slow sand filter be kept at
during operation? Answer: Less than 1.0 NTU.
◉ What is an advantage for installing a pressure filter for a small
water system? Answer: Air binding will not occur.
◉ What type of instrument will help operators improve the
coagulation process the most? Answer: Streaming current monitors.
◉ The pH for a manganese greensand filter for removing iron and
manganese should be adjusted to a range of_____? Answer: 6.2-6.8
◉ The best and most reliable way to check small chlorine leaks is by
______. These small leaks are only ______or less chlorine in the air.
Answer: A chlorine detector and 1 ppm.
◉ Iron and manganese in the distribution system can lead to
bacterial slimes. What is a disadvantage of the elements being in the
distribution system? Answer: Corrosion of metal pipes.
◉ Chloramine is a _____ and is not an especially effective agent
against certain _____. Answer: weak oxidant and viruses.
