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