AWWA ABC Water Distribution Grades
1 & 2 Questions and Answers
1. Which agency sets legal limits on the concentration levels of
harmful conta- minants in potable water distributed to customers?: US
Environmental Protection Agency
2. The number of monthly distributions system bacteriologiacal
samples re- quired is: Based on the population served
3. What is the maximum contaminant level for total trihalomethanes
(TTHM) in the united States?: 0.080 mg/L
4. Under the Surface Water Treatment Rule, disinfection
residuals must be collected at the same location in the distribution
system as: coliform samples
5. Iron can cause "red water" and thus customer complaints when
its concen- tration is above its secondary maximum contaminant
level of: 0.30 mg/L
6. The goal
of the Surface Drinking Water Act is for each to accept
primary enforcement responsibility (primacy) for the operation of
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,the state's drinking water program.: State
7. What is the objective of Total Coliform Rule?: To promote routine surveillance of
distribution system water quality to search for fecal matter and/or disease-causing bacteria
8. Which agency sets standards on the concentration levels of
harmful contam- inants in drinking water?: EPA
9. Explain the difference between the different tiers of violations.
Which tier is the most serious?: Tier 1 = 24 hours (most severe)
Tier 2= 30 days
Tier 3= 1 year
10. A positive E. Coli test must be reported to the primacy health
agency within what time period?: 24 hours
11. How is the required number of monthly bacteriological
samples deter- mined?: Population served
12. What is the action level for lead in first-draw samples taken
from customer taps?: 0.015 mg/L
13. A water system is designated a community public water
system if it serves how many homes?: 15 or more
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, 14. What authority provides specific water sampling instructions?:
The state primacy agency
15. According to the Lead and Copper Rule, what is the action
level for lead?: 0.015 mg/L
16. Head is measured in: Feet
17. A plat is: a map
18. At which time of the day is the age of the water stored in
the distribution system the highest?: Early morning
19. Water mains should primarily be sized based on: adequate fire flow at
an appropriate pressure
20. The most desirable residential pressure ranges from: 50 to 75 psi
(345 to 517kPa)
21. Domestic water use includes water that is supplied to
residential areas,
, and institutional facilities.: commercial districts
22. Riparian doctrine is sometimes called the "rule of: reasonable
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1 & 2 Questions and Answers
1. Which agency sets legal limits on the concentration levels of
harmful conta- minants in potable water distributed to customers?: US
Environmental Protection Agency
2. The number of monthly distributions system bacteriologiacal
samples re- quired is: Based on the population served
3. What is the maximum contaminant level for total trihalomethanes
(TTHM) in the united States?: 0.080 mg/L
4. Under the Surface Water Treatment Rule, disinfection
residuals must be collected at the same location in the distribution
system as: coliform samples
5. Iron can cause "red water" and thus customer complaints when
its concen- tration is above its secondary maximum contaminant
level of: 0.30 mg/L
6. The goal
of the Surface Drinking Water Act is for each to accept
primary enforcement responsibility (primacy) for the operation of
1/
17
,the state's drinking water program.: State
7. What is the objective of Total Coliform Rule?: To promote routine surveillance of
distribution system water quality to search for fecal matter and/or disease-causing bacteria
8. Which agency sets standards on the concentration levels of
harmful contam- inants in drinking water?: EPA
9. Explain the difference between the different tiers of violations.
Which tier is the most serious?: Tier 1 = 24 hours (most severe)
Tier 2= 30 days
Tier 3= 1 year
10. A positive E. Coli test must be reported to the primacy health
agency within what time period?: 24 hours
11. How is the required number of monthly bacteriological
samples deter- mined?: Population served
12. What is the action level for lead in first-draw samples taken
from customer taps?: 0.015 mg/L
13. A water system is designated a community public water
system if it serves how many homes?: 15 or more
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17
, 14. What authority provides specific water sampling instructions?:
The state primacy agency
15. According to the Lead and Copper Rule, what is the action
level for lead?: 0.015 mg/L
16. Head is measured in: Feet
17. A plat is: a map
18. At which time of the day is the age of the water stored in
the distribution system the highest?: Early morning
19. Water mains should primarily be sized based on: adequate fire flow at
an appropriate pressure
20. The most desirable residential pressure ranges from: 50 to 75 psi
(345 to 517kPa)
21. Domestic water use includes water that is supplied to
residential areas,
, and institutional facilities.: commercial districts
22. Riparian doctrine is sometimes called the "rule of: reasonable
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17
