CLASS D WATER LICENSE TEXAS EXAM
2026 LATEST UPDATE QUESTIONS AND
CORRECT VERIFIED ANSWERS ALREADY
GRADED A+
_____ allows uniform pump rates, supplies water for firefighting, and
provides time for disinfection. - ANS-Storage
Ground storage at a surface water treatment plant is called a _____. -
ANS-clear well
The TCEQ requires storage tanks to have covered vents, an airtight cover,
overruns, and _____. - ANS-entry ports
If ground storage is the only storage, capacity must be _____ gallons per
connection. Otherwise, total storage capacity (elevated storage included)
must be _____ gallons per connection. - ANS-200 gallons per
connection
200 gallons per connection
If a 30-inch diameter access opening is not provided in a storage tank, the
primary roof access must not be less than _____ inches. - ANS-30 inches
Storage must be painted, disinfected, and maintained according to OSHA
standards. (true/false) - ANS-false (AWWA standards)
No paint, coating, or wax containing _____ is allowed in storage tanks. -
ANS-lead
,Storage tank coatings for contact with potable water must be approved by
EPA, the National Sanitation Foundation, or the Food and Drug
Administration. (true/false) - ANS-true
_____ is a tank, usually steel, supported aboveground on a tower. - ANS-
Elevated storage
Pressure from an elevated tank is maintained by the _____. - ANS-height
of the water column
In storage tanks, each foot of water column produces _____ psi. - ANS-
0.433 psi
Water stored at least _____ feet above the highest service connection
provides the state's minimum normal operating pressure of _____ psi. -
ANS-80.85 feet above the highest connection
35 psi
A _____ is a tank resting on the ground that is greater in height than
diameter. - ANS-standpipe
Pressure inside a _____ tank is provided by air mechanically compressed
against the water surface. - ANS-hydropneumatic tank
The exterior and interior of ground, elevated, standpipe, and pressure
tanks must be inspected _____. - ANS-yearly
Storage tank inspection results must be kept at least _____ years. - ANS-5
years
_____ is an electrochemical method of preventing corrosion of the interior
of metal tanks. - ANS-Cathodic protection
,Ownership signs must include the utility name and emergency phone
number at each production, treatment, or storage site. (true/false) - ANS-
true
Chain link fence material must leave a gap at the ground to trim grass.
(true/false) - ANS-false
The state requires stored water to have a disinfectant demand. (true/false)
- ANS-false (it requires a disinfectant residual)
After construction or maintenance of a storage tank, a _____ sample must
be taken after filling the tank. - ANS-bacteriological sample
If the bacteriological sample from a storage tank is negative, more
samples must be taken until two consecutive samples are positive.
(true/false) - ANS-false (if negative you're good to go)
Critical safeguards of a distribution system include a chlorine residual,
adequate pressure, bacteriological sampling, and _____ control. - ANS-
cross-connection control
The TCEQ requires that distribution pressure never fall below _____ psi,
even during emergencies, and normal distribution pressure must be at
least _____ psi. - ANS-never fall below 20 psi
35 psi (normal distribution)
Material used in water line construction must meet OSHA specifications
and should not affect the taste, odor, or quality of the water. (true/false) -
ANS-false (AWWA specifications)
Plastic pipe must be NSF approved and have an ASTM pressure rating of at
least _____ psi or a standard dimension ratio of _____. - ANS-150 psi
dimension ratio of 26
, Select pipe on the basis of strength, length carrying capacity, durability,
ease of installation, availability, soil conditions, and cost. (true/false) -
ANS-false (length shouldn't be a consideration)
Prior to January 1, 2014, pipe and fittings containing more than 8.0% lead,
or solders and flux containing more than 0.2% lead, are prohibited in a
public water supply. (true/false) - ANS-true
_____ valves cut off sections of a system. - ANS-Isolating valves
_____ solves problems of taste, odor, red water, or bad samples. - ANS-
Flushing
The _____ meter is the most common design for residential use. - ANS-
positive displacement meter
Mains must be no closer than _____ feet, in all directions, from sewers or
manholes. - ANS-9 feet
Trenches for laying six-inch and larger pipe must be at least _____ inches
wide and ________ inches wider than the pipe diameter. - ANS-18 inches
wide
12 inches wider
The top of a pipe in a trench must have at least ________ inches of cover. -
ANS-24 inches
Do not work in a trench ________ feet or deeper unless it is protected from
cave-in. - ANS-5 feet
Using timber, plywood, or commercial devices to support an excavation is
known as ________. - ANS-shoring
2026 LATEST UPDATE QUESTIONS AND
CORRECT VERIFIED ANSWERS ALREADY
GRADED A+
_____ allows uniform pump rates, supplies water for firefighting, and
provides time for disinfection. - ANS-Storage
Ground storage at a surface water treatment plant is called a _____. -
ANS-clear well
The TCEQ requires storage tanks to have covered vents, an airtight cover,
overruns, and _____. - ANS-entry ports
If ground storage is the only storage, capacity must be _____ gallons per
connection. Otherwise, total storage capacity (elevated storage included)
must be _____ gallons per connection. - ANS-200 gallons per
connection
200 gallons per connection
If a 30-inch diameter access opening is not provided in a storage tank, the
primary roof access must not be less than _____ inches. - ANS-30 inches
Storage must be painted, disinfected, and maintained according to OSHA
standards. (true/false) - ANS-false (AWWA standards)
No paint, coating, or wax containing _____ is allowed in storage tanks. -
ANS-lead
,Storage tank coatings for contact with potable water must be approved by
EPA, the National Sanitation Foundation, or the Food and Drug
Administration. (true/false) - ANS-true
_____ is a tank, usually steel, supported aboveground on a tower. - ANS-
Elevated storage
Pressure from an elevated tank is maintained by the _____. - ANS-height
of the water column
In storage tanks, each foot of water column produces _____ psi. - ANS-
0.433 psi
Water stored at least _____ feet above the highest service connection
provides the state's minimum normal operating pressure of _____ psi. -
ANS-80.85 feet above the highest connection
35 psi
A _____ is a tank resting on the ground that is greater in height than
diameter. - ANS-standpipe
Pressure inside a _____ tank is provided by air mechanically compressed
against the water surface. - ANS-hydropneumatic tank
The exterior and interior of ground, elevated, standpipe, and pressure
tanks must be inspected _____. - ANS-yearly
Storage tank inspection results must be kept at least _____ years. - ANS-5
years
_____ is an electrochemical method of preventing corrosion of the interior
of metal tanks. - ANS-Cathodic protection
,Ownership signs must include the utility name and emergency phone
number at each production, treatment, or storage site. (true/false) - ANS-
true
Chain link fence material must leave a gap at the ground to trim grass.
(true/false) - ANS-false
The state requires stored water to have a disinfectant demand. (true/false)
- ANS-false (it requires a disinfectant residual)
After construction or maintenance of a storage tank, a _____ sample must
be taken after filling the tank. - ANS-bacteriological sample
If the bacteriological sample from a storage tank is negative, more
samples must be taken until two consecutive samples are positive.
(true/false) - ANS-false (if negative you're good to go)
Critical safeguards of a distribution system include a chlorine residual,
adequate pressure, bacteriological sampling, and _____ control. - ANS-
cross-connection control
The TCEQ requires that distribution pressure never fall below _____ psi,
even during emergencies, and normal distribution pressure must be at
least _____ psi. - ANS-never fall below 20 psi
35 psi (normal distribution)
Material used in water line construction must meet OSHA specifications
and should not affect the taste, odor, or quality of the water. (true/false) -
ANS-false (AWWA specifications)
Plastic pipe must be NSF approved and have an ASTM pressure rating of at
least _____ psi or a standard dimension ratio of _____. - ANS-150 psi
dimension ratio of 26
, Select pipe on the basis of strength, length carrying capacity, durability,
ease of installation, availability, soil conditions, and cost. (true/false) -
ANS-false (length shouldn't be a consideration)
Prior to January 1, 2014, pipe and fittings containing more than 8.0% lead,
or solders and flux containing more than 0.2% lead, are prohibited in a
public water supply. (true/false) - ANS-true
_____ valves cut off sections of a system. - ANS-Isolating valves
_____ solves problems of taste, odor, red water, or bad samples. - ANS-
Flushing
The _____ meter is the most common design for residential use. - ANS-
positive displacement meter
Mains must be no closer than _____ feet, in all directions, from sewers or
manholes. - ANS-9 feet
Trenches for laying six-inch and larger pipe must be at least _____ inches
wide and ________ inches wider than the pipe diameter. - ANS-18 inches
wide
12 inches wider
The top of a pipe in a trench must have at least ________ inches of cover. -
ANS-24 inches
Do not work in a trench ________ feet or deeper unless it is protected from
cave-in. - ANS-5 feet
Using timber, plywood, or commercial devices to support an excavation is
known as ________. - ANS-shoring
