1|Page
CLASS C WATER OPERATOR LICENSE
EXAM 2026|COMPLETE EXAM WITH
ACTUAL QUESTIONS AND VERIFIED
SOLUTIONS
The most common valve is the _______. - correct-answer -gate valve
The most commonly used fire hydrants used in distribution systems are the
_________. - correct-answer -dry barrel
Hydrants have a _____ point in case the hydrant is struck by a vehicle. - correct-
answer -breakaway
Controlling valves regulate pressure flow ____ and flow _______. - correct-
answer -rates, direction
Electricity is the preferred power source for most distribution systems because of
______, reliability and relatively low _______. - correct-answer -availability, cost
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5/8 meters need to be tested at least every _____ to _______ yrs. - correct-
answer -5, 10
When disinfecting a water line, use ____mg/L of chlorine in the main and let
stand for ____hrs. - correct-answer -50, 24
When pressure testing the water main, the test pressure should be ___times as
great as the ________ operating pressure. - correct-answer -1.5, normal
Distribution systems are usually laid out in ____ and/or circular designs. - correct-
answer -loops
Dead ends in a system are usually located on ____ shaped or ____ designs. -
correct-answer -tree, grid
An operator may refer to Piezometric elevation, static head, or pressure head as
____ height - correct-answer -vertical water column
The main purpose of the water storage facility is to provide ____ amount of water
to average or equalize the ______ demands plus provide ______ pressures to
fight fires. - correct-answer -sufficient, daily, minimum
, 3|Page
Electrical demand in a wiring system is determined by the amount of ____
consumed. - correct-answer -watts
Baffling inside a storage facility may be needed to prevent "hot spots" and ____
flows. - correct-answer -straight through
A mass of concrete placed at bends and valve structures to prevent pipeline
movement is commonly called a _____. - correct-answer -thrust block
What is the main difference between surface water and groundwater
contamination? - correct-answer -groundwater takes longer to recover after
contamination
A cross-connection is a connection between an _____ and an _______ water
supply. - correct-answer -approved, unapproved
According to the CDC, which mechanism or problem has caused more waterborne
disease outbreaks in the US than any other reported factor? - correct-answer -
leaking backflows
CLASS C WATER OPERATOR LICENSE
EXAM 2026|COMPLETE EXAM WITH
ACTUAL QUESTIONS AND VERIFIED
SOLUTIONS
The most common valve is the _______. - correct-answer -gate valve
The most commonly used fire hydrants used in distribution systems are the
_________. - correct-answer -dry barrel
Hydrants have a _____ point in case the hydrant is struck by a vehicle. - correct-
answer -breakaway
Controlling valves regulate pressure flow ____ and flow _______. - correct-
answer -rates, direction
Electricity is the preferred power source for most distribution systems because of
______, reliability and relatively low _______. - correct-answer -availability, cost
,2|Page
5/8 meters need to be tested at least every _____ to _______ yrs. - correct-
answer -5, 10
When disinfecting a water line, use ____mg/L of chlorine in the main and let
stand for ____hrs. - correct-answer -50, 24
When pressure testing the water main, the test pressure should be ___times as
great as the ________ operating pressure. - correct-answer -1.5, normal
Distribution systems are usually laid out in ____ and/or circular designs. - correct-
answer -loops
Dead ends in a system are usually located on ____ shaped or ____ designs. -
correct-answer -tree, grid
An operator may refer to Piezometric elevation, static head, or pressure head as
____ height - correct-answer -vertical water column
The main purpose of the water storage facility is to provide ____ amount of water
to average or equalize the ______ demands plus provide ______ pressures to
fight fires. - correct-answer -sufficient, daily, minimum
, 3|Page
Electrical demand in a wiring system is determined by the amount of ____
consumed. - correct-answer -watts
Baffling inside a storage facility may be needed to prevent "hot spots" and ____
flows. - correct-answer -straight through
A mass of concrete placed at bends and valve structures to prevent pipeline
movement is commonly called a _____. - correct-answer -thrust block
What is the main difference between surface water and groundwater
contamination? - correct-answer -groundwater takes longer to recover after
contamination
A cross-connection is a connection between an _____ and an _______ water
supply. - correct-answer -approved, unapproved
According to the CDC, which mechanism or problem has caused more waterborne
disease outbreaks in the US than any other reported factor? - correct-answer -
leaking backflows
