Class C Water Operator License Exam Questions and answers Newest RATED A+ 2025/2026

Class C Water Operator License Exam
Questions and answers Newest RATED A+
2025/2026
Ammonia mixed with chlorine gas creates a - Correct Answers white smoke
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II! The most difficult part of a water distribution operator's job. - Correct Answers furnish a
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II! continuous supply II!




II! Physical connection between a safe and potentially unsafe water source. - Correct Answers
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II! cross connection
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II! A distribution system is a - Correct Answers looped system
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II! Dead end mains should be flushed - Correct Answers every month
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II! Excess nitrate causes a condition called - Correct Answers blue baby syndrome
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II! Water hardness is caused by - Correct Answers calcium and magnesium
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II! Sewer mains should be __ft away from water mains. - Correct Answers 9
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II! Water with a pH less than 7 is considered to be - Correct Answers acidic
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II! Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - Correct Answers 5,
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, II! Bacti samples have to be returned to the lab within ___hrs of the collection time. - Correct
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II! Color in the water supply should be less than _____ units. - Correct Answers 15
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II! Chlorine is ______ times heavier than air. - Correct Answers 2.5
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II! 90% of underground pipe failures are related to improper - Correct Answers backfill and
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II! bedding



II! The spoil bank should be located at least ___ft away from the ditch. - Correct Answers 2
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II! The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
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II! chlorine. - Correct Answers .2, .5 II! II! II! II! II! II! II! II! II!




II! Public opinion of the water utility is _______ at a standstill. - Correct Answers never
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II! A bacti sample should be taken every ____ft of pipe. - Correct Answers 1000
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II! The most common collection point for a bacti sample is the water tap _______. - Correct
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II! Answers outside the house II! II! II! II! II! II!




II! A standpipe is considered ground storage unless it exceeds _____ft above the highest ________.
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II! - Correct Answers 80, service connection
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II! ________ protection is the electrochemical method for preventing ________ of metal tanks. -
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II! Correct Answers cathodic, corrosion II! II! II! II! II! II!