TCEQ Class C Water License Exam Questions and Answers
Rated A+
1. State Agency responsince for enforcing the safe drinking water act in
Texas: Texas Commission on environmental Quality
2. What minerals can cause water hardness: Calcium and magnesium
3. A public water system must at all times provide: Adequate quantity of water,
pressure, and disinfection
4. A source groundwater would be: aquifer
5. Fecal coliform organisms sometimes found in water supplies are an indica-
tion that: Water supply is contaminated, harmful bacteria may be present, possible
pathogenic organisms in the water, water is unsuitable for drinking
6. A disease that may be spread by inadequately disinfected water: Dysentery
7. A common chemical used in disinfection of small water supply is: Calcium
hypochlorite
8. A physical connection between a potable water supply and house well
would be: A cross connection
9. The amount of chlorine in mg/L that is used up by reacting with iron organics
of bacteria is called: Demand
10. Which of the following is a physical characteristic of chlorine gas: Green-
ish-Yellow Color, heavier than air, pungent penetrating odor, corrosive
11. Which of the following would be considered a part of a hypo-chlorinator
system: Solution feed pump
12. 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
13. Drawdown of a water well is determined by: Difference in static and pumping
levels
14. pH of water indicates: If it's acidic or basic
15. The pH of water is expressed on a pH scale of: 0-14
16. Water that is considered neutral is expressed on the pH scale at: 7.0
17. Which of the following is a required Step in collecting a routine distribution
sample for bacteriological testing?: Use of an approved, sterile sample container
18. Sand filtration will remove which of the following from surface water: Tur-
bidity
19. Activated carbon is used in a surface water plant primarily for: Taste and
odor control
20. Which or the following chemicals are commonly used as coagulants in
surface water treatment: Alum and ferric chloride
21. 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
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, TCEQ Class C Water License Exam Questions and Answers
Rated A+
22. An elevated storage tank should be protected against corrosion by: Paint-
ing, cathodic protection, water stabilization, and only using galvanized and lead
based primed components
23. A public water supply system should maintain residual pressure of 20 psi
and a minimum of normal operating pressure of: 35 psi
24. 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
25. Water bearing formations beneath the earths surface that are used as a
source of water for public water supplies are: Aquifers
26. The purpose of an air line on a well is: Determine Water leves in the well
27. The mesh size is an important feature of a well screen because properly
sized openings should: Reduce the amount of Sand pumped
28. When treating surface Water, the process of coagularon will be most affect-
ed by the: pH, alkalinity, temperature, and chemical Dosage
29. A rapid sand filter should be backwashed When: The loss of head gauge
indicated between 6 and 10 feet
30. 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
31. 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
32. 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.: 25
33. One gallon of water weighs: 8.34 lbs.
34. One foot of water inside a storage vessel will raise a pressure gauge at the
bottom of the vessel by: 0.433 lbs. (1 ft. Water creates 0.433 psi of pressure)
35. A raw water intake structure may not be constructed with feet
of a boat ramp, dock, or marina: 1,000 feet
36. Common types of pumps for use in water wells are: Vertical turbine and
submersible
37. is the natural exchange of water between the earth and air: The
hydraulic cycle
38. If and when a health hazard contamination event occurs in a public wa-
ter System, the operator must contact the state regulatory authority within
hours by telephone: 24 hours
2/9
Rated A+
1. State Agency responsince for enforcing the safe drinking water act in
Texas: Texas Commission on environmental Quality
2. What minerals can cause water hardness: Calcium and magnesium
3. A public water system must at all times provide: Adequate quantity of water,
pressure, and disinfection
4. A source groundwater would be: aquifer
5. Fecal coliform organisms sometimes found in water supplies are an indica-
tion that: Water supply is contaminated, harmful bacteria may be present, possible
pathogenic organisms in the water, water is unsuitable for drinking
6. A disease that may be spread by inadequately disinfected water: Dysentery
7. A common chemical used in disinfection of small water supply is: Calcium
hypochlorite
8. A physical connection between a potable water supply and house well
would be: A cross connection
9. The amount of chlorine in mg/L that is used up by reacting with iron organics
of bacteria is called: Demand
10. Which of the following is a physical characteristic of chlorine gas: Green-
ish-Yellow Color, heavier than air, pungent penetrating odor, corrosive
11. Which of the following would be considered a part of a hypo-chlorinator
system: Solution feed pump
12. 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
13. Drawdown of a water well is determined by: Difference in static and pumping
levels
14. pH of water indicates: If it's acidic or basic
15. The pH of water is expressed on a pH scale of: 0-14
16. Water that is considered neutral is expressed on the pH scale at: 7.0
17. Which of the following is a required Step in collecting a routine distribution
sample for bacteriological testing?: Use of an approved, sterile sample container
18. Sand filtration will remove which of the following from surface water: Tur-
bidity
19. Activated carbon is used in a surface water plant primarily for: Taste and
odor control
20. Which or the following chemicals are commonly used as coagulants in
surface water treatment: Alum and ferric chloride
21. 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
1/9
, TCEQ Class C Water License Exam Questions and Answers
Rated A+
22. An elevated storage tank should be protected against corrosion by: Paint-
ing, cathodic protection, water stabilization, and only using galvanized and lead
based primed components
23. A public water supply system should maintain residual pressure of 20 psi
and a minimum of normal operating pressure of: 35 psi
24. 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
25. Water bearing formations beneath the earths surface that are used as a
source of water for public water supplies are: Aquifers
26. The purpose of an air line on a well is: Determine Water leves in the well
27. The mesh size is an important feature of a well screen because properly
sized openings should: Reduce the amount of Sand pumped
28. When treating surface Water, the process of coagularon will be most affect-
ed by the: pH, alkalinity, temperature, and chemical Dosage
29. A rapid sand filter should be backwashed When: The loss of head gauge
indicated between 6 and 10 feet
30. 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
31. 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
32. 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.: 25
33. One gallon of water weighs: 8.34 lbs.
34. One foot of water inside a storage vessel will raise a pressure gauge at the
bottom of the vessel by: 0.433 lbs. (1 ft. Water creates 0.433 psi of pressure)
35. A raw water intake structure may not be constructed with feet
of a boat ramp, dock, or marina: 1,000 feet
36. Common types of pumps for use in water wells are: Vertical turbine and
submersible
37. is the natural exchange of water between the earth and air: The
hydraulic cycle
38. If and when a health hazard contamination event occurs in a public wa-
ter System, the operator must contact the state regulatory authority within
hours by telephone: 24 hours
2/9
