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2025 TCEQ CLASS C WATER OPERATOR LICENSE
EXAM ALL QUESTIONS AND CORRECT DETAILED
ANSWERS |ALREADY A GRADED WITH EXPERT
FEEDBACK |NEW AND REVISED
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
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10
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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
2/
10
2025 TCEQ CLASS C WATER OPERATOR LICENSE
EXAM ALL QUESTIONS AND CORRECT DETAILED
ANSWERS |ALREADY A GRADED WITH EXPERT
FEEDBACK |NEW AND REVISED
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
1/
10
,2|Page
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
2/
10
