Class C Water Operator License Exam Ques ons and
answers RATED A+ 2025/2026 100% VERIFIED CORRECT
Ammonia mixed with chlorine gas creates a - Correct Answers white smoke
The most difficult part of a water distribu on operator's job. - Correct Answers furnish a
con nuous supply
Physical connec on between a safe and poten ally unsafe water source. - Correct Answers
cross connec on
A distribu on system is a - Correct Answers looped system
Dead end mains should be flushed - Correct Answers every month
Excess nitrate causes a condi on called - Correct Answers blue baby syndrome
Water hardness is caused by - Correct Answers calcium and magnesium
Sewer mains should be __) away from water mains. - Correct Answers 9
Water with a pH less than 7 is considered to be - Correct Answers acidic
Bac records are kept for ____yrs and chemical records are kept for ___yrs. - Correct Answers
5, 10
Bac samples have to be returned to the lab within ___hrs of the collec on me. - Correct
Answers 30
, Color in the water supply should be less than _____ units. - Correct Answers 15
Chlorine is ______ mes heavier than air. - Correct Answers 2.5
90% of underground pipe failures are related to improper - Correct Answers backfill and
bedding
The spoil bank should be located at least ___) away from the ditch. - Correct Answers 2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - Correct Answers .2, .5
Public opinion of the water u lity is _______ at a stands ll. - Correct Answers never
A bac sample should be taken every ____) of pipe. - Correct Answers 1000
The most common collec on point for a bac sample is the water tap _______. - Correct
Answers outside the house
A standpipe is considered ground storage unless it exceeds _____) above the highest
________. - Correct Answers 80, service connec on
________ protec on is the electrochemical method for preven ng ________ of metal tanks. -
Correct Answers cathodic, corrosion
The _____ is the only cross connec on control method approved by _______. - Correct
Answers air gap, tceq
answers RATED A+ 2025/2026 100% VERIFIED CORRECT
Ammonia mixed with chlorine gas creates a - Correct Answers white smoke
The most difficult part of a water distribu on operator's job. - Correct Answers furnish a
con nuous supply
Physical connec on between a safe and poten ally unsafe water source. - Correct Answers
cross connec on
A distribu on system is a - Correct Answers looped system
Dead end mains should be flushed - Correct Answers every month
Excess nitrate causes a condi on called - Correct Answers blue baby syndrome
Water hardness is caused by - Correct Answers calcium and magnesium
Sewer mains should be __) away from water mains. - Correct Answers 9
Water with a pH less than 7 is considered to be - Correct Answers acidic
Bac records are kept for ____yrs and chemical records are kept for ___yrs. - Correct Answers
5, 10
Bac samples have to be returned to the lab within ___hrs of the collec on me. - Correct
Answers 30
, Color in the water supply should be less than _____ units. - Correct Answers 15
Chlorine is ______ mes heavier than air. - Correct Answers 2.5
90% of underground pipe failures are related to improper - Correct Answers backfill and
bedding
The spoil bank should be located at least ___) away from the ditch. - Correct Answers 2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - Correct Answers .2, .5
Public opinion of the water u lity is _______ at a stands ll. - Correct Answers never
A bac sample should be taken every ____) of pipe. - Correct Answers 1000
The most common collec on point for a bac sample is the water tap _______. - Correct
Answers outside the house
A standpipe is considered ground storage unless it exceeds _____) above the highest
________. - Correct Answers 80, service connec on
________ protec on is the electrochemical method for preven ng ________ of metal tanks. -
Correct Answers cathodic, corrosion
The _____ is the only cross connec on control method approved by _______. - Correct
Answers air gap, tceq
