CLASS C WATER OPERATOR LICENSE
EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
Ammonia mixed with chlorine gas creates a - ANS white smoke
The most difficult part of a water distribution operator's job. - ANS furnish a continuous
supply
Physical connection between a safe and potentially unsafe water source. - ANS cross
connection
A distribution system is a - ANS looped system
Dead end mains should be flushed - ANS every month
Excess nitrate causes a condition called - ANS blue baby syndrome
Water hardness is caused by - ANS calcium and magnesium
Sewer mains should be __ft away from water mains. - ANS 9
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Water with a pH less than 7 is considered to be - ANS acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - ANS 5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time. - ANS 30
Color in the water supply should be less than _____ units. - ANS 15
Chlorine is ______ times heavier than air. - ANS 2.5
90% of underground pipe failures are related to improper - ANS backfill and bedding
The spoil bank should be located at least ___ft away from the ditch. - ANS 2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - ANS .2, .5
Public opinion of the water utility is _______ at a standstill. - ANS never
A bacti sample should be taken every ____ft of pipe. - ANS 1000
The most common collection point for a bacti sample is the water tap _______. - ANS outside
the house
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
Ammonia mixed with chlorine gas creates a - ANS white smoke
The most difficult part of a water distribution operator's job. - ANS furnish a continuous
supply
Physical connection between a safe and potentially unsafe water source. - ANS cross
connection
A distribution system is a - ANS looped system
Dead end mains should be flushed - ANS every month
Excess nitrate causes a condition called - ANS blue baby syndrome
Water hardness is caused by - ANS calcium and magnesium
Sewer mains should be __ft away from water mains. - ANS 9
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Water with a pH less than 7 is considered to be - ANS acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - ANS 5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time. - ANS 30
Color in the water supply should be less than _____ units. - ANS 15
Chlorine is ______ times heavier than air. - ANS 2.5
90% of underground pipe failures are related to improper - ANS backfill and bedding
The spoil bank should be located at least ___ft away from the ditch. - ANS 2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - ANS .2, .5
Public opinion of the water utility is _______ at a standstill. - ANS never
A bacti sample should be taken every ____ft of pipe. - ANS 1000
The most common collection point for a bacti sample is the water tap _______. - ANS outside
the house
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
