TCEQ CLASS C WATER LICENSE 2024 COMPREHENSIVE
QUESTIONS WITH VERIFIED ANSWERS(100% CORRECT)
A common chemical used in disinfection of small water supply is - (correct answer) Calcium
hypochlorite
A physical connection between a potable water supply and house well would be - (correct
answer) A cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is called -
(correct answer) Demand
Which of the following is a physical characteristic of chlorine gas - (correct answer) Greenish-
Yellow Color, heavier than air, pungent penetrating odor, corrosive
Which of the following would be considered a part of a hypo-chlorinator system - (correct
answer) Solution feed pump
State Agency responsince for enforcing the safe drinking water act in Texas - (correct answer)
Texas Commission on environmental Quality
When treating surface Water, the process of coagularon will be most affected by the - (correct
answer) pH, alkalinity, temperature, and chemical Dosage
A rapid sand filter should be backwashed When - (correct answer) 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 - (correct answer) 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 minerals can cause water hardness - (correct answer) Calcium and magnesium
A public water system must at all times provide - (correct answer) Adequate quantity of water,
pressure, and disinfection
A source groundwater would be - (correct answer) aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that - (correct
answer) 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 - (correct answer) Dysentery
According to state requirements, all public water Supply wells should be provided with a raised
concrete sealing block, screened vents, and- - (correct answer) A flow measuring device
Drawdown of a water well is determined by - (correct answer) Difference in static and pumping
levels
pH of water indicates - (correct answer) If it's acidic or basic
The pH of water is expressed on a pH scale of - (correct answer) 0-14
Water that is considered neutral is expressed on the pH scale at - (correct answer) 7.0
Which of the following is a required Step in collecting a routine distribution sample for
bacteriological testing? - (correct answer) Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water - (correct answer) Turbidity
Activated carbon is used in a surface water plant primarily for - (correct answer) Taste and odor
control
Which or the following chemicals are commonly used as coagulants in surface water treatment -
(correct answer) Alum and ferric chloride
Ground storage tanks are required to provided with which of the following - (correct answer)
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 - (correct answer) 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 - (correct answer) 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 - (correct answer) 50 mg/L
Water bearing formations beneath the earths surface that are used as a source of water for public
water supplies are - (correct answer) Aquifers
The purpose of an air line on a well is - (correct answer) Determine Water leves in the well
QUESTIONS WITH VERIFIED ANSWERS(100% CORRECT)
A common chemical used in disinfection of small water supply is - (correct answer) Calcium
hypochlorite
A physical connection between a potable water supply and house well would be - (correct
answer) A cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is called -
(correct answer) Demand
Which of the following is a physical characteristic of chlorine gas - (correct answer) Greenish-
Yellow Color, heavier than air, pungent penetrating odor, corrosive
Which of the following would be considered a part of a hypo-chlorinator system - (correct
answer) Solution feed pump
State Agency responsince for enforcing the safe drinking water act in Texas - (correct answer)
Texas Commission on environmental Quality
When treating surface Water, the process of coagularon will be most affected by the - (correct
answer) pH, alkalinity, temperature, and chemical Dosage
A rapid sand filter should be backwashed When - (correct answer) 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 - (correct answer) 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 minerals can cause water hardness - (correct answer) Calcium and magnesium
A public water system must at all times provide - (correct answer) Adequate quantity of water,
pressure, and disinfection
A source groundwater would be - (correct answer) aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that - (correct
answer) 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 - (correct answer) Dysentery
According to state requirements, all public water Supply wells should be provided with a raised
concrete sealing block, screened vents, and- - (correct answer) A flow measuring device
Drawdown of a water well is determined by - (correct answer) Difference in static and pumping
levels
pH of water indicates - (correct answer) If it's acidic or basic
The pH of water is expressed on a pH scale of - (correct answer) 0-14
Water that is considered neutral is expressed on the pH scale at - (correct answer) 7.0
Which of the following is a required Step in collecting a routine distribution sample for
bacteriological testing? - (correct answer) Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water - (correct answer) Turbidity
Activated carbon is used in a surface water plant primarily for - (correct answer) Taste and odor
control
Which or the following chemicals are commonly used as coagulants in surface water treatment -
(correct answer) Alum and ferric chloride
Ground storage tanks are required to provided with which of the following - (correct answer)
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 - (correct answer) 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 - (correct answer) 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 - (correct answer) 50 mg/L
Water bearing formations beneath the earths surface that are used as a source of water for public
water supplies are - (correct answer) Aquifers
The purpose of an air line on a well is - (correct answer) Determine Water leves in the well
