TCEQ CLASS D WATER OPERATOR LICENSE
EXAM PREP QUESTIONS AND ANSWERS
FULL SOLUTION
●● The most difficult part of a water distribution operator's job.
Answer: furnish a continuous supply
●● Physical connection between a safe and potentially unsafe water
source.
Answer: cross connection
●● A distribution system is a
Answer: looped system
●● Dead end mains should be flushed
Answer: every month
●● Excess nitrate causes a condition called
Answer: blue baby syndrome
●● Water hardness is caused by
Answer: calcium and magnesium
,●● Sewer mains should be __ft away from water mains.
Answer: 9
●● Water with a pH less than 7 is considered to be
Answer: acidic
●● Bacti records are kept for ____yrs and chemical records are kept for
___yrs.
Answer: 5, 10
●● Bacti samples have to be returned to the lab within ___hrs of the
collection time.
Answer: 30
●● Color in the water supply should be less than _____ units.
Answer: 15
●● Chlorine is ______ times heavier than air.
Answer: 2.5
●● 90% of underground pipe failures are related to improper
Answer: backfill and bedding
, ●● The spoil bank should be located at least ___ft away from the ditch.
Answer: 2
●● The following minimum residuals is ______mg/L for free chlorine
and ____mg/L for total chlorine.
Answer: .2, .5
●● Public opinion of the water utility is _______ at a standstill.
Answer: never
●● A bacti sample should be taken every ____ft of pipe.
Answer: 1000
●● The most common collection point for a bacti sample is the water tap
_______.
Answer: outside the house
●● A standpipe is considered ground storage unless it exceeds _____ft
above the highest ________.
Answer: 80, service connection
EXAM PREP QUESTIONS AND ANSWERS
FULL SOLUTION
●● The most difficult part of a water distribution operator's job.
Answer: furnish a continuous supply
●● Physical connection between a safe and potentially unsafe water
source.
Answer: cross connection
●● A distribution system is a
Answer: looped system
●● Dead end mains should be flushed
Answer: every month
●● Excess nitrate causes a condition called
Answer: blue baby syndrome
●● Water hardness is caused by
Answer: calcium and magnesium
,●● Sewer mains should be __ft away from water mains.
Answer: 9
●● Water with a pH less than 7 is considered to be
Answer: acidic
●● Bacti records are kept for ____yrs and chemical records are kept for
___yrs.
Answer: 5, 10
●● Bacti samples have to be returned to the lab within ___hrs of the
collection time.
Answer: 30
●● Color in the water supply should be less than _____ units.
Answer: 15
●● Chlorine is ______ times heavier than air.
Answer: 2.5
●● 90% of underground pipe failures are related to improper
Answer: backfill and bedding
, ●● The spoil bank should be located at least ___ft away from the ditch.
Answer: 2
●● The following minimum residuals is ______mg/L for free chlorine
and ____mg/L for total chlorine.
Answer: .2, .5
●● Public opinion of the water utility is _______ at a standstill.
Answer: never
●● A bacti sample should be taken every ____ft of pipe.
Answer: 1000
●● The most common collection point for a bacti sample is the water tap
_______.
Answer: outside the house
●● A standpipe is considered ground storage unless it exceeds _____ft
above the highest ________.
Answer: 80, service connection
