AWWA ABC WATER DISTRIBUTION GRADES
1&2
1. Which agency sets legal limits on the concentration levels of harmful conta-
minants in potable water distributed to customers?
Answer US Environmental Protection Agency
2. The number of monthly distributions system bacteriologiacal samples re-
quired is
Answer Based on the population served
3. What is the maximum contaminant level for total trihalomethanes (TTHM) in
the united States?
Answer 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
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,Answer coliform samples
5. Iron can cause "red water" and thus customer complaints when its concen-
tration is above its secondary maximum contaminant level of
Answer 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 the state's
drinking water program.
Answer State
7. 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
8. Which agency sets standards on the concentration levels of harmful contam-
inants in drinking water?
Answer EPA
9. Explain the difference between the different tiers of violations. Which tier is
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31
,the most serious?
Answer 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?
Answer 24 hours
11. How is the required number of monthly bacteriological samples deter-
mined?
Answer Population served
12. What is the action level for lead in first-draw samples taken from customer
taps?
Answer 0.015 mg/L
13. A water system is designated a community public water system if it serves
how many homes?
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, Answer 15 or more
14. What authority provides specific water sampling instructions?
Answer The state primacy agency
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1&2
1. Which agency sets legal limits on the concentration levels of harmful conta-
minants in potable water distributed to customers?
Answer US Environmental Protection Agency
2. The number of monthly distributions system bacteriologiacal samples re-
quired is
Answer Based on the population served
3. What is the maximum contaminant level for total trihalomethanes (TTHM) in
the united States?
Answer 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
1/
31
,Answer coliform samples
5. Iron can cause "red water" and thus customer complaints when its concen-
tration is above its secondary maximum contaminant level of
Answer 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 the state's
drinking water program.
Answer State
7. 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
8. Which agency sets standards on the concentration levels of harmful contam-
inants in drinking water?
Answer EPA
9. Explain the difference between the different tiers of violations. Which tier is
2/
31
,the most serious?
Answer 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?
Answer 24 hours
11. How is the required number of monthly bacteriological samples deter-
mined?
Answer Population served
12. What is the action level for lead in first-draw samples taken from customer
taps?
Answer 0.015 mg/L
13. A water system is designated a community public water system if it serves
how many homes?
3/
31
, Answer 15 or more
14. What authority provides specific water sampling instructions?
Answer The state primacy agency
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31
