2026 Class C Water Operator License Exam verified with
correct answers
Bacti records are kept for ____yrs and chemical records are kept for ___yrs.-
answer>>> >>>5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time.-
answer>>> >>>30
Color in the water supply should be less than _____ units.- answer>>> >>>15
Chlorine is ______ times heavier than air.- answer>>> >>>2.5
90% of underground pipe failures are related to improper- answer>>> >>>backfill and
bedding
The spoil bank should be located at least ___ft away from the ditch.- answer>>> >>>2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine.- answer>>> >>>.2, .5
Public opinion of the water utility is _______ at a standstill.- answer>>> >>>never
A bacti sample should be taken every ____ft of pipe.- answer>>> >>>1000
The most common collection point for a bacti sample is the water tap _______.-
answer>>> >>>outside the house
A standpipe is considered ground storage unless it exceeds _____ft above the highest
________.- answer>>> >>>80, service connection
________ protection is the electrochemical method for preventing ________ of metal
tanks.- answer>>> >>>cathodic, corrosion
The _____ is the only cross connection control method approved by _______.-
answer>>> >>>air gap, tceq
_______ on a pipeline depend on the _____ or coefficient of pipe roughness.-
answer>>> >>>friction loss, c factor
__________ occurs whenever there is a ______ in the velocity or direction of water
flow.- answer>>> >>>water hammer, sudden change
The ______ water pressure required by the rules and regulations is ____psi under any
and all conditions.- answer>>> >>>minimum, 20
, 100, 150, 200 and 250 are approved classes of _____ _____.- answer>>> >>>working
pressure
______ is used to anchor pipe bends.- answer>>> >>>concrete
A general deposit of mineral particles evenly along the inside of the pipe is ________.-
answer>>> >>>tuberculation
Shoring should be used if a ditch is ___ft or deeper.- answer>>> >>>5
A written sample writing plan is required for _______ monitoring.- answer>>>
>>>coliform
Ladders should be placed every ___ft in a ditch.- answer>>> >>>25
An oxygen deficient atmosphere is defined as one which contains _____ than ______
% oxygen.- answer>>> >>>less, 19.5
Characteristics of a Centrifugal Pump:
as the head _____ the discharge ________.- answer>>> >>>increases, decreases
The operator should leave a ________ of slack in flexible tubing.- answer>>>
>>>gooseneck
The most common type of water meter is the ____ ____ meter.- answer>>> >>>positive
displacement
Ammonia mixed with chlorine gas creates a- answer>>> >>>white smoke
The most difficult part of a water distribution operator's job.- answer>>> >>>furnish a
continuous supply
Physical connection between a safe and potentially unsafe water source.- answer>>>
>>>cross connection
A distribution system is a- answer>>> >>>looped system
Dead end mains should be flushed- answer>>> >>>every month
Excess nitrate causes a condition called- answer>>> >>>blue baby syndrome
Water hardness is caused by- answer>>> >>>calcium and magnesium
Sewer mains should be __ft away from water mains.- answer>>> >>>9
Water with a pH less than 7 is considered to be- answer>>> >>>acidic
correct answers
Bacti records are kept for ____yrs and chemical records are kept for ___yrs.-
answer>>> >>>5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time.-
answer>>> >>>30
Color in the water supply should be less than _____ units.- answer>>> >>>15
Chlorine is ______ times heavier than air.- answer>>> >>>2.5
90% of underground pipe failures are related to improper- answer>>> >>>backfill and
bedding
The spoil bank should be located at least ___ft away from the ditch.- answer>>> >>>2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine.- answer>>> >>>.2, .5
Public opinion of the water utility is _______ at a standstill.- answer>>> >>>never
A bacti sample should be taken every ____ft of pipe.- answer>>> >>>1000
The most common collection point for a bacti sample is the water tap _______.-
answer>>> >>>outside the house
A standpipe is considered ground storage unless it exceeds _____ft above the highest
________.- answer>>> >>>80, service connection
________ protection is the electrochemical method for preventing ________ of metal
tanks.- answer>>> >>>cathodic, corrosion
The _____ is the only cross connection control method approved by _______.-
answer>>> >>>air gap, tceq
_______ on a pipeline depend on the _____ or coefficient of pipe roughness.-
answer>>> >>>friction loss, c factor
__________ occurs whenever there is a ______ in the velocity or direction of water
flow.- answer>>> >>>water hammer, sudden change
The ______ water pressure required by the rules and regulations is ____psi under any
and all conditions.- answer>>> >>>minimum, 20
, 100, 150, 200 and 250 are approved classes of _____ _____.- answer>>> >>>working
pressure
______ is used to anchor pipe bends.- answer>>> >>>concrete
A general deposit of mineral particles evenly along the inside of the pipe is ________.-
answer>>> >>>tuberculation
Shoring should be used if a ditch is ___ft or deeper.- answer>>> >>>5
A written sample writing plan is required for _______ monitoring.- answer>>>
>>>coliform
Ladders should be placed every ___ft in a ditch.- answer>>> >>>25
An oxygen deficient atmosphere is defined as one which contains _____ than ______
% oxygen.- answer>>> >>>less, 19.5
Characteristics of a Centrifugal Pump:
as the head _____ the discharge ________.- answer>>> >>>increases, decreases
The operator should leave a ________ of slack in flexible tubing.- answer>>>
>>>gooseneck
The most common type of water meter is the ____ ____ meter.- answer>>> >>>positive
displacement
Ammonia mixed with chlorine gas creates a- answer>>> >>>white smoke
The most difficult part of a water distribution operator's job.- answer>>> >>>furnish a
continuous supply
Physical connection between a safe and potentially unsafe water source.- answer>>>
>>>cross connection
A distribution system is a- answer>>> >>>looped system
Dead end mains should be flushed- answer>>> >>>every month
Excess nitrate causes a condition called- answer>>> >>>blue baby syndrome
Water hardness is caused by- answer>>> >>>calcium and magnesium
Sewer mains should be __ft away from water mains.- answer>>> >>>9
Water with a pH less than 7 is considered to be- answer>>> >>>acidic
