TCEQ Class C Water Operator License Exam
2026/2027 Questions And Correct Answers
Graded A+
A physical connection between a potable water supply and house well would be
A cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of
bacteria is called
Demand
Which of the following is a physical characteristic of chlorine gas
Greenish-Yellow Color, heavier than air, pungent penetrating odor, corrosive
Which of the following would be considered a part of a hypo-chlorinator system
Solution feed pump
According to state requirements, all public water Supply wells should be provided
with a raised concrete sealing block, screened vents, and-
A flow measuring device
,Drawdown of a water well is determined by
Difference in static and pumping levels
pH of water indicates
If it's acidic or basic
The pH of water is expressed on a pH scale of
0-14
Water that is considered neutral is expressed on the pH scale at
7.0
Which of the following is a required Step in collecting a routine distribution
sample for bacteriological testing?
Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water
Turbidity
, Activated carbon is used in a surface water plant primarily for
Taste and odor control
Which or the following chemicals are commonly used as coagulants in surface
water treatment
Alum and ferric chloride
Ground storage tanks are required to provided with which of the following
Screened vents, an approved locking roof hatch, an overflow pipe with hinged flap
device, annual inspection and maintenance as needed
An elevated storage tank should be protected against corrosion by
Painting, cathodic protection, water stabilization, and only using galvanized and
lead based primed components
A public water supply system should maintain residual pressure of 20 psi and a
minimum of normal operating pressure of
35 psi
Before a new or repaired water line is placed into service, it must be properly
disinfected by providing a chlorine dosage of _________ and proper detention time
50 mg/L
2026/2027 Questions And Correct Answers
Graded A+
A physical connection between a potable water supply and house well would be
A cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of
bacteria is called
Demand
Which of the following is a physical characteristic of chlorine gas
Greenish-Yellow Color, heavier than air, pungent penetrating odor, corrosive
Which of the following would be considered a part of a hypo-chlorinator system
Solution feed pump
According to state requirements, all public water Supply wells should be provided
with a raised concrete sealing block, screened vents, and-
A flow measuring device
,Drawdown of a water well is determined by
Difference in static and pumping levels
pH of water indicates
If it's acidic or basic
The pH of water is expressed on a pH scale of
0-14
Water that is considered neutral is expressed on the pH scale at
7.0
Which of the following is a required Step in collecting a routine distribution
sample for bacteriological testing?
Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water
Turbidity
, Activated carbon is used in a surface water plant primarily for
Taste and odor control
Which or the following chemicals are commonly used as coagulants in surface
water treatment
Alum and ferric chloride
Ground storage tanks are required to provided with which of the following
Screened vents, an approved locking roof hatch, an overflow pipe with hinged flap
device, annual inspection and maintenance as needed
An elevated storage tank should be protected against corrosion by
Painting, cathodic protection, water stabilization, and only using galvanized and
lead based primed components
A public water supply system should maintain residual pressure of 20 psi and a
minimum of normal operating pressure of
35 psi
Before a new or repaired water line is placed into service, it must be properly
disinfected by providing a chlorine dosage of _________ and proper detention time
50 mg/L
