Class C Water Operator License Exam
(2026/2027) Questions and Verified Answers,
100% Guarantee Pass
Ammonia mixed with chlorine gas creates a - CORRECT ANSWER -white smoke
The most difficult part of a water distribution operator's job. - CORRECT ANSWER -furnish a
continuous supply
Physical connection between a safe and potentially unsafe water source. - CORRECT ANSWER
-cross connection
A distribution system is a - CORRECT ANSWER -looped system
Dead end mains should be flushed - CORRECT ANSWER -every month
Excess nitrate causes a condition called - CORRECT ANSWER -blue baby syndrome
Water hardness is caused by - CORRECT ANSWER -calcium and magnesium
Sewer mains should be __ft away from water mains. - CORRECT ANSWER -9
Water with a pH less than 7 is considered to be - CORRECT ANSWER -acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - CORRECT
ANSWER -5, 10
, Bacti samples have to be returned to the lab within ___hrs of the collection time. - CORRECT
ANSWER -30
Color in the water supply should be less than _____ units. - CORRECT ANSWER -15
Chlorine is ______ times heavier than air. - CORRECT ANSWER -2.5
90% of underground pipe failures are related to improper - CORRECT ANSWER -backfill and
bedding
The spoil bank should be located at least ___ft away from the ditch. - CORRECT ANSWER -2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - CORRECT ANSWER -.2, .5
Public opinion of the water utility is _______ at a standstill. - CORRECT ANSWER -never
A bacti sample should be taken every ____ft of pipe. - CORRECT ANSWER -1000
The most common collection point for a bacti sample is the water tap _______. - CORRECT
ANSWER -outside the house
A standpipe is considered ground storage unless it exceeds _____ft above the highest ________.
- CORRECT ANSWER -80, service connection
________ protection is the electrochemical method for preventing ________ of metal tanks. -
CORRECT ANSWER -cathodic, corrosion
(2026/2027) Questions and Verified Answers,
100% Guarantee Pass
Ammonia mixed with chlorine gas creates a - CORRECT ANSWER -white smoke
The most difficult part of a water distribution operator's job. - CORRECT ANSWER -furnish a
continuous supply
Physical connection between a safe and potentially unsafe water source. - CORRECT ANSWER
-cross connection
A distribution system is a - CORRECT ANSWER -looped system
Dead end mains should be flushed - CORRECT ANSWER -every month
Excess nitrate causes a condition called - CORRECT ANSWER -blue baby syndrome
Water hardness is caused by - CORRECT ANSWER -calcium and magnesium
Sewer mains should be __ft away from water mains. - CORRECT ANSWER -9
Water with a pH less than 7 is considered to be - CORRECT ANSWER -acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - CORRECT
ANSWER -5, 10
, Bacti samples have to be returned to the lab within ___hrs of the collection time. - CORRECT
ANSWER -30
Color in the water supply should be less than _____ units. - CORRECT ANSWER -15
Chlorine is ______ times heavier than air. - CORRECT ANSWER -2.5
90% of underground pipe failures are related to improper - CORRECT ANSWER -backfill and
bedding
The spoil bank should be located at least ___ft away from the ditch. - CORRECT ANSWER -2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - CORRECT ANSWER -.2, .5
Public opinion of the water utility is _______ at a standstill. - CORRECT ANSWER -never
A bacti sample should be taken every ____ft of pipe. - CORRECT ANSWER -1000
The most common collection point for a bacti sample is the water tap _______. - CORRECT
ANSWER -outside the house
A standpipe is considered ground storage unless it exceeds _____ft above the highest ________.
- CORRECT ANSWER -80, service connection
________ protection is the electrochemical method for preventing ________ of metal tanks. -
CORRECT ANSWER -cathodic, corrosion
