Page 1 of 23
AWWA ABC Water Distribution Grades 1 & 2 exam
ALL QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR NEW!!
QUESTION: At which time of the day is the age of the water stored in the distribution system
the highest? - ANSWER-Early morning
QUESTION: Water mains should primarily be sized based on - ANSWER-adequate fire flow at an
appropriate pressure
QUESTION: The most desirable residential pressure ranges from - ANSWER-50 to 75 psi (345 to
517kPa)
QUESTION: Domestic water use includes water that is supplied to residential areas,
____________, and institutional facilities. - ANSWER-commercial districts
QUESTION: Riparian doctrine is sometimes called the "rule of - ANSWER-reasonable sharing."
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,Page 2 of 23
QUESTION: During which season is water typically the highest? - ANSWER-summer
QUESTION: Of the common types of distribution system, which type is considered least
desirable? - ANSWER-Tree system
QUESTION: The velocity of water is calculated as the quantity of water that flows through a
pipe - ANSWER-divided by the cross-sectional area of pipe
QUESTION: What is the term for water pressure in a main or in a container that is measured by
a gauge? - ANSWER-Gage pressure
Which agency sets legal limits on the concentration levels of harmful contaminants in potable
water distributed to customers? - ANSWER-US Environmental Protection Agency
QUESTION: The number of monthly distributions system bacteriologiacal samples required is -
ANSWER-Based on the population served
QUESTION: What is the maximum contaminant level for total trihalomethanes (TTHM) in the
united States? - ANSWER-0.080 mg/L
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, Page 3 of 23
QUESTION: Under the Surface Water Treatment Rule, disinfection residuals must be collected
at the same location in the distribution system as - ANSWER-coliform samples
QUESTION: Iron can cause "red water" and thus customer complaints when its concentration is
above its secondary maximum contaminant level of - ANSWER-0.30 mg/L
QUESTION: The goal of the Surface Drinking Water Act is for each ________ to accept primary
enforcement responsibility (primacy) for the operation of the state's drinking water program. -
ANSWER-State
QUESTION: What is the objective of Total Coliform Rule? - ANSWER-To promote routine
surveillance of distribution system water quality to search for fecal matter and/or disease-
causing bacteria
QUESTION: Which agency sets standards on the concentration levels of harmful contaminants
in drinking water? - ANSWER-EPA
3
AWWA ABC Water Distribution Grades 1 & 2 exam
ALL QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR NEW!!
QUESTION: At which time of the day is the age of the water stored in the distribution system
the highest? - ANSWER-Early morning
QUESTION: Water mains should primarily be sized based on - ANSWER-adequate fire flow at an
appropriate pressure
QUESTION: The most desirable residential pressure ranges from - ANSWER-50 to 75 psi (345 to
517kPa)
QUESTION: Domestic water use includes water that is supplied to residential areas,
____________, and institutional facilities. - ANSWER-commercial districts
QUESTION: Riparian doctrine is sometimes called the "rule of - ANSWER-reasonable sharing."
1
,Page 2 of 23
QUESTION: During which season is water typically the highest? - ANSWER-summer
QUESTION: Of the common types of distribution system, which type is considered least
desirable? - ANSWER-Tree system
QUESTION: The velocity of water is calculated as the quantity of water that flows through a
pipe - ANSWER-divided by the cross-sectional area of pipe
QUESTION: What is the term for water pressure in a main or in a container that is measured by
a gauge? - ANSWER-Gage pressure
Which agency sets legal limits on the concentration levels of harmful contaminants in potable
water distributed to customers? - ANSWER-US Environmental Protection Agency
QUESTION: The number of monthly distributions system bacteriologiacal samples required is -
ANSWER-Based on the population served
QUESTION: What is the maximum contaminant level for total trihalomethanes (TTHM) in the
united States? - ANSWER-0.080 mg/L
2
, Page 3 of 23
QUESTION: Under the Surface Water Treatment Rule, disinfection residuals must be collected
at the same location in the distribution system as - ANSWER-coliform samples
QUESTION: Iron can cause "red water" and thus customer complaints when its concentration is
above its secondary maximum contaminant level of - ANSWER-0.30 mg/L
QUESTION: The goal of the Surface Drinking Water Act is for each ________ to accept primary
enforcement responsibility (primacy) for the operation of the state's drinking water program. -
ANSWER-State
QUESTION: What is the objective of Total Coliform Rule? - ANSWER-To promote routine
surveillance of distribution system water quality to search for fecal matter and/or disease-
causing bacteria
QUESTION: Which agency sets standards on the concentration levels of harmful contaminants
in drinking water? - ANSWER-EPA
3
