AWWA Water Operator Certification Prep Course | Latest
Update 2026 | Graded A+
A watercourse that flows continuously at all times of the year is known as what? -
correct answerPerennial stream
What is defined as 'the killing or inactivation of pathogenic organisms in water'? - correct
answerDisinfection
Free chlorine residual values are based on a contact time of how long? - correct
answer10 mins
What time of day does algae cause the pH of the water decrease? - correct
answerNight time
What contributes to the creation of algae blooms? - correct answerIncreased nutrients
What is found mainly in groundwater sources and forms a precipitate when oxidized? -
correct answerIron
The riparian doctrine is also known as what? - correct answerRule of reasonable
sharing
What is the typical strength of calcium hypochlorite, i.e. available chlorine range? -
correct answer65-70%
Which chemicals will raise pH? - correct answerSoda ash,
Lime,
Caustic soda
What should be used by an operator to test for residual chlorine? - correct answerDPD
(N, N-diethyl-p-phenylenediamine)
pH is a measure of? - correct answerHydrogen ion concentration
After chlorination, what is included in free chlorine residuals? - correct answerOCL- and
HOCL
After initial full service operation, grease lubricated bearings should be re-greased at
what frequency? - correct answer3 to 6 months
If only two rings of packing are used in the stuffing box, how should the joints should
be? - correct answerStaggered
, Opening the discharge valve one full turn on a chlorine cylinder will? - correct
answerPermit maximum discharge
What defines the term "C value"? - correct answerNumber that describes the
smoothness of the interior of a pipe
Tubercles can form on which type of pipe? - correct answerDuctile iron
Which disease is capable of being transmitted by water? - correct answerTyphoid
Which act directly impacts the treatment of drinking water? - correct answerSafe water
drinking act
Corrosive water acting on a customers plumbing may cause which metal to enter their
drinking water? - correct answerLead
What is the most common water complaint? - correct answerObjectionable taste and/or
odor
According to the Surface Water Treatment Rule, water systems serving a population
greater than 500 Persons must sample the filtered water for turbidity how often? -
correct answerEvery 4 hours
For surface water systems without filtration, the SWTR requires public water systems
to? - correct answerMaintain a C x T value above the minimum value
At a minimum, surface water treatment systems must treat for? - correct
answerColiform bacteria and turbidity
What US agency establishes drinking water standards? - correct answerUSEPA
What is the ratio of lime to copper sulfate for controlling algae growth on basin walls? -
correct answer1 part lime to 1 part copper sulfate
What is copper sulfate used for in surface water reservoirs? - correct answerTo control
algae
Of the following microorganisms, which is the correct order from smallest to largest?
Bacteria, Giardia cysts, Viruses - correct answerViruses, bacteria, Giardia cysts
What is the usual strength of sodium hypochlorite, i.e. available chlorine? - correct
answer5 to 15%
What are Trihalomethanes usually associated with? - correct answerWater with
organics that has been chlorinated
Update 2026 | Graded A+
A watercourse that flows continuously at all times of the year is known as what? -
correct answerPerennial stream
What is defined as 'the killing or inactivation of pathogenic organisms in water'? - correct
answerDisinfection
Free chlorine residual values are based on a contact time of how long? - correct
answer10 mins
What time of day does algae cause the pH of the water decrease? - correct
answerNight time
What contributes to the creation of algae blooms? - correct answerIncreased nutrients
What is found mainly in groundwater sources and forms a precipitate when oxidized? -
correct answerIron
The riparian doctrine is also known as what? - correct answerRule of reasonable
sharing
What is the typical strength of calcium hypochlorite, i.e. available chlorine range? -
correct answer65-70%
Which chemicals will raise pH? - correct answerSoda ash,
Lime,
Caustic soda
What should be used by an operator to test for residual chlorine? - correct answerDPD
(N, N-diethyl-p-phenylenediamine)
pH is a measure of? - correct answerHydrogen ion concentration
After chlorination, what is included in free chlorine residuals? - correct answerOCL- and
HOCL
After initial full service operation, grease lubricated bearings should be re-greased at
what frequency? - correct answer3 to 6 months
If only two rings of packing are used in the stuffing box, how should the joints should
be? - correct answerStaggered
, Opening the discharge valve one full turn on a chlorine cylinder will? - correct
answerPermit maximum discharge
What defines the term "C value"? - correct answerNumber that describes the
smoothness of the interior of a pipe
Tubercles can form on which type of pipe? - correct answerDuctile iron
Which disease is capable of being transmitted by water? - correct answerTyphoid
Which act directly impacts the treatment of drinking water? - correct answerSafe water
drinking act
Corrosive water acting on a customers plumbing may cause which metal to enter their
drinking water? - correct answerLead
What is the most common water complaint? - correct answerObjectionable taste and/or
odor
According to the Surface Water Treatment Rule, water systems serving a population
greater than 500 Persons must sample the filtered water for turbidity how often? -
correct answerEvery 4 hours
For surface water systems without filtration, the SWTR requires public water systems
to? - correct answerMaintain a C x T value above the minimum value
At a minimum, surface water treatment systems must treat for? - correct
answerColiform bacteria and turbidity
What US agency establishes drinking water standards? - correct answerUSEPA
What is the ratio of lime to copper sulfate for controlling algae growth on basin walls? -
correct answer1 part lime to 1 part copper sulfate
What is copper sulfate used for in surface water reservoirs? - correct answerTo control
algae
Of the following microorganisms, which is the correct order from smallest to largest?
Bacteria, Giardia cysts, Viruses - correct answerViruses, bacteria, Giardia cysts
What is the usual strength of sodium hypochlorite, i.e. available chlorine? - correct
answer5 to 15%
What are Trihalomethanes usually associated with? - correct answerWater with
organics that has been chlorinated
