Class C Water Operator License Exam Latest Update
2026-2027 Exam 110 Questions with 100% Verified
Correct Answers Guaranteed A+
_____ all shoring from the top down and _____ from the bottom up. - CORRECT ANSWER:
install, remove
______ is the last barrier between the public and giardia or cryptosporidium. - CORRECT
ANSWER: filtration
______ is used to anchor pipe bends. - CORRECT ANSWER: concrete
_______ on a pipeline depend on the _____ or coefficient of pipe roughness. - CORRECT
ANSWER: friction loss, c factor
________ protection is the electrochemical method for preventing ________ of metal tanks. -
CORRECT ANSWER: cathodic, corrosion
__________ occurs whenever there is a ______ in the velocity or direction of water flow. -
CORRECT ANSWER: water hammer, sudden change
_____% of all the water on earth is saltwater. - CORRECT ANSWER: 97
_____% of the earth's surface is ocean. - CORRECT ANSWER: 75
5/8 meters need to be tested at least every _____ to _______ yrs. - CORRECT ANSWER: 5, 10
90% of underground pipe failures are related to improper - CORRECT ANSWER: backfill and
bedding
, 100, 150, 200 and 250 are approved classes of _____ _____. - CORRECT ANSWER: working
pressure
A 5' deep pipe trench requires exit ladders every ____ feet and it needs to have approved ____. -
CORRECT ANSWER: 25. shoring
A bacti sample should be taken every ____ft of pipe. - CORRECT ANSWER: 1000
A commonly used method to test for chlorine residual in water is called the ____ method. -
CORRECT ANSWER: dpd
A cross-connection is a connection between an _____ and an _______ water supply. -
CORRECT ANSWER: approved, unapproved
A distribution system is a - CORRECT ANSWER: looped system
A general deposit of mineral particles evenly along the inside of the pipe is ________. -
CORRECT ANSWER: tuberculation
A mass of concrete placed at bends and valve structures to prevent pipeline movement is
commonly called a _____. - CORRECT ANSWER: thrust block
A piston meter is a _____ meter. - CORRECT ANSWER: displacement
A standpipe is considered ground storage unless it exceeds _____ft above the highest ________.
- CORRECT ANSWER: 80, service connection
A written sample writing plan is required for _______ monitoring. - CORRECT ANSWER:
coliform
2026-2027 Exam 110 Questions with 100% Verified
Correct Answers Guaranteed A+
_____ all shoring from the top down and _____ from the bottom up. - CORRECT ANSWER:
install, remove
______ is the last barrier between the public and giardia or cryptosporidium. - CORRECT
ANSWER: filtration
______ is used to anchor pipe bends. - CORRECT ANSWER: concrete
_______ on a pipeline depend on the _____ or coefficient of pipe roughness. - CORRECT
ANSWER: friction loss, c factor
________ protection is the electrochemical method for preventing ________ of metal tanks. -
CORRECT ANSWER: cathodic, corrosion
__________ occurs whenever there is a ______ in the velocity or direction of water flow. -
CORRECT ANSWER: water hammer, sudden change
_____% of all the water on earth is saltwater. - CORRECT ANSWER: 97
_____% of the earth's surface is ocean. - CORRECT ANSWER: 75
5/8 meters need to be tested at least every _____ to _______ yrs. - CORRECT ANSWER: 5, 10
90% of underground pipe failures are related to improper - CORRECT ANSWER: backfill and
bedding
, 100, 150, 200 and 250 are approved classes of _____ _____. - CORRECT ANSWER: working
pressure
A 5' deep pipe trench requires exit ladders every ____ feet and it needs to have approved ____. -
CORRECT ANSWER: 25. shoring
A bacti sample should be taken every ____ft of pipe. - CORRECT ANSWER: 1000
A commonly used method to test for chlorine residual in water is called the ____ method. -
CORRECT ANSWER: dpd
A cross-connection is a connection between an _____ and an _______ water supply. -
CORRECT ANSWER: approved, unapproved
A distribution system is a - CORRECT ANSWER: looped system
A general deposit of mineral particles evenly along the inside of the pipe is ________. -
CORRECT ANSWER: tuberculation
A mass of concrete placed at bends and valve structures to prevent pipeline movement is
commonly called a _____. - CORRECT ANSWER: thrust block
A piston meter is a _____ meter. - CORRECT ANSWER: displacement
A standpipe is considered ground storage unless it exceeds _____ft above the highest ________.
- CORRECT ANSWER: 80, service connection
A written sample writing plan is required for _______ monitoring. - CORRECT ANSWER:
coliform
