TCEQ CLASS C WATER LICENCE
EXAM WITH CORRECT QUESTIONS
AND VERIFIED ANSWERS
What minerals can cause water hardness - answer✔✔✨-Calcium and magnesium
A public water system must at all times provide - answer✔✔✨-Adequate quantity of water,
pressure, and disinfection
A source groundwater would be - answer✔✔✨-aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that - 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 - answer✔✔✨-Dysentery
A common chemical used in disinfection of small water supply is - answer✔✔✨-Calcium
hypochlorite
A physical connection between a potable water supply and house well would be - answer✔✔✨-A
cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is called -
answer✔✔✨-Demand
,Which of the following is a physical characteristic of chlorine gas - 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 - answer✔✔✨-
Solution feed pump
According to state requirements, all public water Supply wells should be provided with a raised concrete
sealing block, screened vents, and- - answer✔✔✨-A flow measuring device
Drawdown of a water well is determined by - answer✔✔✨-Difference in static and pumping levels
pH of water indicates - answer✔✔✨-If it's acidic or basic
The pH of water is expressed on a pH scale of - answer✔✔✨-0-14
Water that is considered neutral is expressed on the pH scale at - answer✔✔✨-7.0
Which of the following is a required Step in collecting a routine distribution sample for bacteriological
testing? - answer✔✔✨-Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water - answer✔✔✨-Turbidity
Activated carbon is used in a surface water plant primarily for - answer✔✔✨-Taste and odor control
Which or the following chemicals are commonly used as coagulants in surface water treatment -
answer✔✔✨-Alum and ferric chloride
Ground storage tanks are required to provided with which of the following - 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 - 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 - 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 - answer✔✔✨-50 mg/L
Water bearing formations beneath the earths surface that are used as a source of water for public water
supplies are - answer✔✔✨-Aquifers
The purpose of an air line on a well is - answer✔✔✨-Determine Water leves in the well
The mesh size is an important feature of a well screen because properly sized openings should -
answer✔✔✨-Reduce the amount of Sand pumped
When treating surface Water, the process of coagularon will be most affected by the - answer✔✔✨-
pH, alkalinity, temperature, and chemical Dosage
A rapid sand filter should be backwashed When - 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
- 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 is the approximate total volume of a circular tank in gallons, if it is 30 feet in diameter, and 15 feet
deep - answer✔✔✨-79,300 gallons
EXAM WITH CORRECT QUESTIONS
AND VERIFIED ANSWERS
What minerals can cause water hardness - answer✔✔✨-Calcium and magnesium
A public water system must at all times provide - answer✔✔✨-Adequate quantity of water,
pressure, and disinfection
A source groundwater would be - answer✔✔✨-aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that - 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 - answer✔✔✨-Dysentery
A common chemical used in disinfection of small water supply is - answer✔✔✨-Calcium
hypochlorite
A physical connection between a potable water supply and house well would be - answer✔✔✨-A
cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is called -
answer✔✔✨-Demand
,Which of the following is a physical characteristic of chlorine gas - 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 - answer✔✔✨-
Solution feed pump
According to state requirements, all public water Supply wells should be provided with a raised concrete
sealing block, screened vents, and- - answer✔✔✨-A flow measuring device
Drawdown of a water well is determined by - answer✔✔✨-Difference in static and pumping levels
pH of water indicates - answer✔✔✨-If it's acidic or basic
The pH of water is expressed on a pH scale of - answer✔✔✨-0-14
Water that is considered neutral is expressed on the pH scale at - answer✔✔✨-7.0
Which of the following is a required Step in collecting a routine distribution sample for bacteriological
testing? - answer✔✔✨-Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water - answer✔✔✨-Turbidity
Activated carbon is used in a surface water plant primarily for - answer✔✔✨-Taste and odor control
Which or the following chemicals are commonly used as coagulants in surface water treatment -
answer✔✔✨-Alum and ferric chloride
Ground storage tanks are required to provided with which of the following - 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 - 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 - 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 - answer✔✔✨-50 mg/L
Water bearing formations beneath the earths surface that are used as a source of water for public water
supplies are - answer✔✔✨-Aquifers
The purpose of an air line on a well is - answer✔✔✨-Determine Water leves in the well
The mesh size is an important feature of a well screen because properly sized openings should -
answer✔✔✨-Reduce the amount of Sand pumped
When treating surface Water, the process of coagularon will be most affected by the - answer✔✔✨-
pH, alkalinity, temperature, and chemical Dosage
A rapid sand filter should be backwashed When - 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
- 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 is the approximate total volume of a circular tank in gallons, if it is 30 feet in diameter, and 15 feet
deep - answer✔✔✨-79,300 gallons
