Class C Water Operator License Exam
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. Ammonia mixed with chlorine gas creates a - Correct Answer: white smoke
2. The most difficult part of a water distribution operator's job. - Correct Answer:
furnish a continuous supply
3. Physical connection between a safe and potentially unsafe water source. - Correct
Answer: cross connection
4. A distribution system is a - Correct Answer: looped system
5. Dead end mains should be flushed - Correct Answer: every month
6. Excess nitrate causes a condition called - Correct Answer: blue baby syndrome
7. Water hardness is caused by - Correct Answer: calcium and magnesium
8. Sewer mains should be __ft away from water mains. - Correct Answer: 9
,9. Water with a pH less than 7 is considered to be - Correct Answer: acidic
10. Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - Correct
Answer: 5, 10
11. Bacti samples have to be returned to the lab within ___hrs of the collection time. -
Correct Answer: 30
12. Color in the water supply should be less than _____ units. - Correct Answer: 15
13. Chlorine is ______ times heavier than air. - Correct Answer: 2.5
14. 90% of underground pipe failures are related to improper - Correct Answer: backfill
and bedding
15. The spoil bank should be located at least ___ft away from the ditch. - Correct
Answer: 2
16. The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - Correct Answer: .2, .5
17. Public opinion of the water utility is _______ at a standstill. - Correct Answer: never
18. A bacti sample should be taken every ____ft of pipe. - Correct Answer: 1000
, 19. The most common collection point for a bacti sample is the water tap _______. -
Correct Answer: outside the house
20. A standpipe is considered ground storage unless it exceeds _____ft above the highest
________. - Correct Answer: 80, service connection
21. ________ protection is the electrochemical method for preventing ________ of metal
tanks. - Correct Answer: cathodic, corrosion
22. The _____ is the only cross connection control method approved by _______. -
Correct Answer: air gap, tceq
23. _______ on a pipeline depend on the _____ or coefficient of pipe roughness. -
Correct Answer: friction loss, c factor
24. __________ occurs whenever there is a ______ in the velocity or direction of water flow.
- Correct Answer: water hammer, sudden change
25. The ______ water pressure required by the rules and regulations is ____psi under any
and all conditions. - Correct Answer: minimum, 20
26. 100, 150, 200 and 250 are approved classes of _____ _____. - Correct Answer:
working pressure
27. ______ is used to anchor pipe bends. - Correct Answer: concrete
28. A general deposit of mineral particles evenly along the inside of the pipe is ________. -
Correct Answer: tuberculation
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!!
Current Update!!
1. Ammonia mixed with chlorine gas creates a - Correct Answer: white smoke
2. The most difficult part of a water distribution operator's job. - Correct Answer:
furnish a continuous supply
3. Physical connection between a safe and potentially unsafe water source. - Correct
Answer: cross connection
4. A distribution system is a - Correct Answer: looped system
5. Dead end mains should be flushed - Correct Answer: every month
6. Excess nitrate causes a condition called - Correct Answer: blue baby syndrome
7. Water hardness is caused by - Correct Answer: calcium and magnesium
8. Sewer mains should be __ft away from water mains. - Correct Answer: 9
,9. Water with a pH less than 7 is considered to be - Correct Answer: acidic
10. Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - Correct
Answer: 5, 10
11. Bacti samples have to be returned to the lab within ___hrs of the collection time. -
Correct Answer: 30
12. Color in the water supply should be less than _____ units. - Correct Answer: 15
13. Chlorine is ______ times heavier than air. - Correct Answer: 2.5
14. 90% of underground pipe failures are related to improper - Correct Answer: backfill
and bedding
15. The spoil bank should be located at least ___ft away from the ditch. - Correct
Answer: 2
16. The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - Correct Answer: .2, .5
17. Public opinion of the water utility is _______ at a standstill. - Correct Answer: never
18. A bacti sample should be taken every ____ft of pipe. - Correct Answer: 1000
, 19. The most common collection point for a bacti sample is the water tap _______. -
Correct Answer: outside the house
20. A standpipe is considered ground storage unless it exceeds _____ft above the highest
________. - Correct Answer: 80, service connection
21. ________ protection is the electrochemical method for preventing ________ of metal
tanks. - Correct Answer: cathodic, corrosion
22. The _____ is the only cross connection control method approved by _______. -
Correct Answer: air gap, tceq
23. _______ on a pipeline depend on the _____ or coefficient of pipe roughness. -
Correct Answer: friction loss, c factor
24. __________ occurs whenever there is a ______ in the velocity or direction of water flow.
- Correct Answer: water hammer, sudden change
25. The ______ water pressure required by the rules and regulations is ____psi under any
and all conditions. - Correct Answer: minimum, 20
26. 100, 150, 200 and 250 are approved classes of _____ _____. - Correct Answer:
working pressure
27. ______ is used to anchor pipe bends. - Correct Answer: concrete
28. A general deposit of mineral particles evenly along the inside of the pipe is ________. -
Correct Answer: tuberculation
