AWWA ABC Water Distribution Grades
1 & 2 Exam Questions and Answers
Which agency sets legal limits on the concentration levels of harmful contaminants in
potable water distributed to customers? - ANSWER-US Environmental Protection
Agency
The number of monthly distributions system bacteriologiacal samples required is -
ANSWER-Based on the population served
What is the maximum contaminant level for total trihalomethanes (TTHM) in the
united States? - ANSWER-0.080 mg/L
Under the Surface Water Treatment Rule, disinfection residuals must be collected at
the same location in the distribution system as - ANSWER-coliform samples
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
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
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
Which agency sets standards on the concentration levels of harmful contaminants in
drinking water? - ANSWER-EPA
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
A positive E. Coli test must be reported to the primacy health agency within what
time period? - ANSWER-24 hours
How is the required number of monthly bacteriological samples determined? -
ANSWER-Population served
What is the action level for lead in first-draw samples taken from customer taps? -
ANSWER-0.015 mg/L
, A water system is designated a community public water system if it serves how
many homes? - ANSWER-15 or more
What authority provides specific water sampling instructions? - ANSWER-The state
primacy agency
According to the Lead and Copper Rule, what is the action level for lead? -
ANSWER-0.015 mg/L
Head is measured in - ANSWER-Feet
A plat is - ANSWER-a map
At which time of the day is the age of the water stored in the distribution system the
highest? - ANSWER-Early morning
Water mains should primarily be sized based on - ANSWER-adequate fire flow at an
appropriate pressure
The most desirable residential pressure ranges from - ANSWER-50 to 75 psi (345 to
517kPa)
Domestic water use includes water that is supplied to residential areas,
____________, and institutional facilities. - ANSWER-commercial districts
Riparian doctrine is sometimes called the "rule of - ANSWER-reasonable sharing."
During which season is water typically the highest? - ANSWER-summer
Of the common types of distribution system, which type is considered least
desirable? - ANSWER-Tree system
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
What is the term for water pressure in a main or in a container that is measured by a
gauge? - ANSWER-Gage pressure
In hydraulics, how is head expressed? - ANSWER-ft-pounds per pound
What is the term for pressure measured in terms of the height of water ( in meters or
feet)? - ANSWER-Head
What are three types of head? - ANSWER-Elevation head
velocity head
pressure head
The highest degree of protection for the exterior of a coating steel pipe is -
ANSWER-Cathodic protection
1 & 2 Exam Questions and Answers
Which agency sets legal limits on the concentration levels of harmful contaminants in
potable water distributed to customers? - ANSWER-US Environmental Protection
Agency
The number of monthly distributions system bacteriologiacal samples required is -
ANSWER-Based on the population served
What is the maximum contaminant level for total trihalomethanes (TTHM) in the
united States? - ANSWER-0.080 mg/L
Under the Surface Water Treatment Rule, disinfection residuals must be collected at
the same location in the distribution system as - ANSWER-coliform samples
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
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
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
Which agency sets standards on the concentration levels of harmful contaminants in
drinking water? - ANSWER-EPA
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
A positive E. Coli test must be reported to the primacy health agency within what
time period? - ANSWER-24 hours
How is the required number of monthly bacteriological samples determined? -
ANSWER-Population served
What is the action level for lead in first-draw samples taken from customer taps? -
ANSWER-0.015 mg/L
, A water system is designated a community public water system if it serves how
many homes? - ANSWER-15 or more
What authority provides specific water sampling instructions? - ANSWER-The state
primacy agency
According to the Lead and Copper Rule, what is the action level for lead? -
ANSWER-0.015 mg/L
Head is measured in - ANSWER-Feet
A plat is - ANSWER-a map
At which time of the day is the age of the water stored in the distribution system the
highest? - ANSWER-Early morning
Water mains should primarily be sized based on - ANSWER-adequate fire flow at an
appropriate pressure
The most desirable residential pressure ranges from - ANSWER-50 to 75 psi (345 to
517kPa)
Domestic water use includes water that is supplied to residential areas,
____________, and institutional facilities. - ANSWER-commercial districts
Riparian doctrine is sometimes called the "rule of - ANSWER-reasonable sharing."
During which season is water typically the highest? - ANSWER-summer
Of the common types of distribution system, which type is considered least
desirable? - ANSWER-Tree system
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
What is the term for water pressure in a main or in a container that is measured by a
gauge? - ANSWER-Gage pressure
In hydraulics, how is head expressed? - ANSWER-ft-pounds per pound
What is the term for pressure measured in terms of the height of water ( in meters or
feet)? - ANSWER-Head
What are three types of head? - ANSWER-Elevation head
velocity head
pressure head
The highest degree of protection for the exterior of a coating steel pipe is -
ANSWER-Cathodic protection
