Page 1 of 24
AWWA ABC Water Distribution Grade 1 &
Grade 2 Exam ALL QUESTIONS AND
VERIFIED SOLUTIONS LATEST UPDATE
THIS YEAR
QUESTION: Explain the difference between the different tiers of violations. Which tier is the
most serious? - ANSWER-Tier 1 = 24 hours (most severe)
Tier 2= 30 days
Tier 3= 1 year
QUESTION: A positive E. Coli test must be reported to the primacy health agency within what
time period? - ANSWER-24 hours
QUESTION: How is the required number of monthly bacteriological samples determined? -
ANSWER-Population served
QUESTION: What is the action level for lead in first-draw samples taken from customer taps? -
ANSWER-0.015 mg/L
1
, Page 2 of 24
QUESTION: A water system is designated a community public water system if it serves how
many homes? - ANSWER-15 or more
QUESTION: What authority provides specific water sampling instructions? - ANSWER-The state
primacy agency
QUESTION: According to the Lead and Copper Rule, what is the action level for lead? - ANSWER-
0.015 mg/L
QUESTION: Head is measured in - ANSWER-Feet
QUESTION: A plat is - ANSWER-a map
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
2
, Page 3 of 24
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."
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
Which agency sets legal limits on the concentration levels of harmful contaminants in potable
water distributed to customers? - ANSWER-US Environmental Protection Agency
3
AWWA ABC Water Distribution Grade 1 &
Grade 2 Exam ALL QUESTIONS AND
VERIFIED SOLUTIONS LATEST UPDATE
THIS YEAR
QUESTION: Explain the difference between the different tiers of violations. Which tier is the
most serious? - ANSWER-Tier 1 = 24 hours (most severe)
Tier 2= 30 days
Tier 3= 1 year
QUESTION: A positive E. Coli test must be reported to the primacy health agency within what
time period? - ANSWER-24 hours
QUESTION: How is the required number of monthly bacteriological samples determined? -
ANSWER-Population served
QUESTION: What is the action level for lead in first-draw samples taken from customer taps? -
ANSWER-0.015 mg/L
1
, Page 2 of 24
QUESTION: A water system is designated a community public water system if it serves how
many homes? - ANSWER-15 or more
QUESTION: What authority provides specific water sampling instructions? - ANSWER-The state
primacy agency
QUESTION: According to the Lead and Copper Rule, what is the action level for lead? - ANSWER-
0.015 mg/L
QUESTION: Head is measured in - ANSWER-Feet
QUESTION: A plat is - ANSWER-a map
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
2
, Page 3 of 24
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."
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
Which agency sets legal limits on the concentration levels of harmful contaminants in potable
water distributed to customers? - ANSWER-US Environmental Protection Agency
3
