TCEQ CLASS C WATER LICENSE EXAM LATEST 2026 UPDATED
QUESTIONS AND VERIFIED 100% SOLUTIONS (2026/2027) |A+
GRADED |GUARANTEED PASS
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
State Agency responsince for enforcing the safe drinking water act in Texas
Texas Commission on environmental Quality
1|Page
,What minerals can cause water hardness
Calcium and magnesium
A public water system must at all times provide
Adequate quantity of water, pressure, and disinfection
A source groundwater would be
aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that
Water supply is contaminated, harmful bacteria may be present, possible pathogenic organisms
in the water, water is unsuitable for drinking
A disease that may be spread by inadequately disinfected water
Dysentery
A common chemical used in disinfection of small water supply is
Calcium hypochlorite
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
2|Page
, 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
Water bearing formations beneath the earths surface that are used as a source of water for
public water supplies are
Aquifers
The purpose of an air line on a well is
Determine Water leves in the well
The mesh size is an important feature of a well screen because properly sized openings should
Reduce the amount of Sand pumped
When treating surface Water, the process of coagularon will be most affected by the
pH, alkalinity, temperature, and chemical Dosage
A rapid sand filter should be backwashed When
The loss of head gauge indicated between 6 and 10 feet
Which of the following is an acceptable disinfection residual at the far reaches of the
distribution System
0.2 mg/L free chlorine residual, 0.8 mg/L chloramine residual when using chloramine treatment,
0.5 mg/L chloramine for surface water supply, 0.5 mg/L free chlorine residual for ground water
Supply
What is the approximate total volume of a circular tank in gallons, if it is 30 feet in diameter,
and 15 feet deep
79,300 gallons
You are using a chlorinator to provine a dosage of 4.0 mg/L. If the daily Water usage is
750,000 gallons, the gas chlorinator feed rate should be set at ____________ pounds per day.
3|Page
QUESTIONS AND VERIFIED 100% SOLUTIONS (2026/2027) |A+
GRADED |GUARANTEED PASS
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
State Agency responsince for enforcing the safe drinking water act in Texas
Texas Commission on environmental Quality
1|Page
,What minerals can cause water hardness
Calcium and magnesium
A public water system must at all times provide
Adequate quantity of water, pressure, and disinfection
A source groundwater would be
aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that
Water supply is contaminated, harmful bacteria may be present, possible pathogenic organisms
in the water, water is unsuitable for drinking
A disease that may be spread by inadequately disinfected water
Dysentery
A common chemical used in disinfection of small water supply is
Calcium hypochlorite
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
2|Page
, 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
Water bearing formations beneath the earths surface that are used as a source of water for
public water supplies are
Aquifers
The purpose of an air line on a well is
Determine Water leves in the well
The mesh size is an important feature of a well screen because properly sized openings should
Reduce the amount of Sand pumped
When treating surface Water, the process of coagularon will be most affected by the
pH, alkalinity, temperature, and chemical Dosage
A rapid sand filter should be backwashed When
The loss of head gauge indicated between 6 and 10 feet
Which of the following is an acceptable disinfection residual at the far reaches of the
distribution System
0.2 mg/L free chlorine residual, 0.8 mg/L chloramine residual when using chloramine treatment,
0.5 mg/L chloramine for surface water supply, 0.5 mg/L free chlorine residual for ground water
Supply
What is the approximate total volume of a circular tank in gallons, if it is 30 feet in diameter,
and 15 feet deep
79,300 gallons
You are using a chlorinator to provine a dosage of 4.0 mg/L. If the daily Water usage is
750,000 gallons, the gas chlorinator feed rate should be set at ____________ pounds per day.
3|Page
