CLASS C WATER LICENSE ACTUAL EXAM QUESTIONS WITH
ANSWERS 2025/2026 GRADED
the major responsibility of a certified waterworks operator is to - insure that a safe and
adequate supply of drinking water is delivered to the customers tap
according to the TCEQ, a public water system is defined as any water system that
provides piped water for human consumption to at least _ service connections on a
year-round basis or regularly serves _ individuals daily at least_ days out of the year -
15 25 60
most of the surface water in texas comes from - precipitation that falls within the state
the most important factor in preventing accidents Is - the attitude of the employee
organics in surface water will combine with halogen to form - trihaolmethanes
according to the average annual water budget for Texas, the majority of surface water
leaves the state by - evaporation and transpiration
the term water stabilization refers to - pH adjustments
which pH measurement would indicate that water is basic (6.0;6.9;7.0;8.3) - 8.3
the safe water drinking act has set water quality standards for which category - physical
and chemical, radiological, and bacteriological
when a coagulant reacts with finely divided and suspended material in raw water, a -
floc is formed
the rules and regulations for public water systems require straight flow rectangular
sedimentation basins to be designed to provide detention time of at least - 6 hours
which of the following statements regarding the sedimentation process is true - the 4
traditional zones of a rectangular sedimentation basin are the inlet zone, settling zone,
and the sludge zone
tastes and odors caused by decaying vegetation can often be removed in the treatment
process by the use of - activated carbon
What chemical is used for softening water - lime (soda ash)
the process of coagulation includes - A chemical reaction, a physical reaction, an
agglomeration reaction, and neutralization of charged particles
, If sludge is allowed to remain too long on the bottom of a sedimentation basin, a
problem could develop with - taste and odor problems,reduction of detention time in
basin, resuspension of solids, and creation of septic conditions
coagulation is affected by - turbidity, pH, and temperature
in raw water reservoirs, the most common effect of aeration is - removal of taste and
odors
sedimentation is improved by - uniform, horizontal, low velocity flow across the basin
the most important water quality change in filter effluent is - turbidity
soda ash is used in water treatment process to - adjust pH
A sand filter will not remove - dissolved oxygen
the occurrence of mud balls in the beds of filters may be prevented by - proper
sedimentation
the loss-of head through a sand filter bed is influenced by - sand particles size, filtration
rate, water temperature, and the concentration of dissolved gasses
the term floc refers to - the flecks of coagulant containing trapped suspended matter
the maximum flow rate trough a sand filter should be 2-4 gpm per square foot -
baffles are used to prevent short-circuiting in - sedimentation basin
filter underdrains or bottom serve several important purposes including - deliver the
back wash water uniformly underneath the filter media
jar tests are used to determine the correct chemical dosage -
the rules and regulations for public water systems states the minimum pressures in all
water distribution systems must not be less than 20 psi and that normal operating
pressure must not be less than - 35psi
the state board of insurance recommended capacity for ground storage includes - 4-6
hour supply, 130 gallons per capita, 200 gallons per connection
an altitude valve is used to - control the water elevation in an elevated storage tank
two pressure gauges at the foot of two storage tanks are at the same elevation. the
water levels in the two tanks are the same, but tank x holds 1,000,000 gallons of water
ANSWERS 2025/2026 GRADED
the major responsibility of a certified waterworks operator is to - insure that a safe and
adequate supply of drinking water is delivered to the customers tap
according to the TCEQ, a public water system is defined as any water system that
provides piped water for human consumption to at least _ service connections on a
year-round basis or regularly serves _ individuals daily at least_ days out of the year -
15 25 60
most of the surface water in texas comes from - precipitation that falls within the state
the most important factor in preventing accidents Is - the attitude of the employee
organics in surface water will combine with halogen to form - trihaolmethanes
according to the average annual water budget for Texas, the majority of surface water
leaves the state by - evaporation and transpiration
the term water stabilization refers to - pH adjustments
which pH measurement would indicate that water is basic (6.0;6.9;7.0;8.3) - 8.3
the safe water drinking act has set water quality standards for which category - physical
and chemical, radiological, and bacteriological
when a coagulant reacts with finely divided and suspended material in raw water, a -
floc is formed
the rules and regulations for public water systems require straight flow rectangular
sedimentation basins to be designed to provide detention time of at least - 6 hours
which of the following statements regarding the sedimentation process is true - the 4
traditional zones of a rectangular sedimentation basin are the inlet zone, settling zone,
and the sludge zone
tastes and odors caused by decaying vegetation can often be removed in the treatment
process by the use of - activated carbon
What chemical is used for softening water - lime (soda ash)
the process of coagulation includes - A chemical reaction, a physical reaction, an
agglomeration reaction, and neutralization of charged particles
, If sludge is allowed to remain too long on the bottom of a sedimentation basin, a
problem could develop with - taste and odor problems,reduction of detention time in
basin, resuspension of solids, and creation of septic conditions
coagulation is affected by - turbidity, pH, and temperature
in raw water reservoirs, the most common effect of aeration is - removal of taste and
odors
sedimentation is improved by - uniform, horizontal, low velocity flow across the basin
the most important water quality change in filter effluent is - turbidity
soda ash is used in water treatment process to - adjust pH
A sand filter will not remove - dissolved oxygen
the occurrence of mud balls in the beds of filters may be prevented by - proper
sedimentation
the loss-of head through a sand filter bed is influenced by - sand particles size, filtration
rate, water temperature, and the concentration of dissolved gasses
the term floc refers to - the flecks of coagulant containing trapped suspended matter
the maximum flow rate trough a sand filter should be 2-4 gpm per square foot -
baffles are used to prevent short-circuiting in - sedimentation basin
filter underdrains or bottom serve several important purposes including - deliver the
back wash water uniformly underneath the filter media
jar tests are used to determine the correct chemical dosage -
the rules and regulations for public water systems states the minimum pressures in all
water distribution systems must not be less than 20 psi and that normal operating
pressure must not be less than - 35psi
the state board of insurance recommended capacity for ground storage includes - 4-6
hour supply, 130 gallons per capita, 200 gallons per connection
an altitude valve is used to - control the water elevation in an elevated storage tank
two pressure gauges at the foot of two storage tanks are at the same elevation. the
water levels in the two tanks are the same, but tank x holds 1,000,000 gallons of water
