TCEQ CLASS C WATER LICENSE EXAM WITH 158
QUESTIONS & CORRECT ANSWERS LATEST 2025
State Agency responsince for enforcing the safe drinking water act in Texas -
ANSWER-Texas Commission on environmental Quality
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
QUESTIONS & CORRECT ANSWERS LATEST 2025
State Agency responsince for enforcing the safe drinking water act in Texas -
ANSWER-Texas Commission on environmental Quality
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
