WSO WATER DISTRIBUTION GRADE 3 & 4 TEST WITH
LATEST UPDATED (QUESTIONS AND ANSWERS) ALREADY
PASSED!
If a water system collects at least 40 samples per month for the analyses
of total coliforms, what percentage of total coliform positive samples are
acceptable for the system to remain in compliance with the maximum
contaminant level for total coliforms? Correct Answers No more than
5%
Water systems are required to achieve at least ___ removal and/or
inactivation of viruses between a point where the raw water is not
subject to recontamination by surface water runoff and a point
downstream before or at the first customer. Correct Answers 4 log
Continuous chlorine residual monitoring is required where the water
enters the distribution system under the Surface Water Treatment Rule
when the Correct Answers population served is >3,300 people.
A community water system must post the Consumer Confidence Report
on a publicly accessible website if it serves more than Correct Answers
100,000 people.
Public water systems that cannot meet the required removal of total
organic compounds (TOCs) can comply if the source-water TOC level
is, calculated quarterly as a running annual average. Correct Answers
<2.0 mg/L
,The Surface Water Treatment Rule does not specify which of the
following treatment technology? Correct Answers Chloramine
disinfection
A regulated organic contaminant concentration that exceeds the MCL
Correct Answers is a Tier 2 violation requiring public notification within
30 days.
Operators must balance satisfying regulations on the amount of certain
chlorinated organic compounds with meeting disinfection limits. Correct
Answers
A water system using conventional filtration treatment does not have to
use enhanced coagulation to achieve the total organic carbon (TOC)
removal if Correct Answers the treated water quarterly running average
TOC is less than 2.0 mg/L.
Regulations that govern US water supply and treatment are developed
by the US Environmental Protection Agency under what act? Correct
Answers Safe Drinking Water Act (SDWA)
According to the US Environmental Protection Agency's primary
drinking water standards, what is the maximum contaminant level goal
for copper? Correct Answers 1.3 mg/L
, According to the US Environmental Protection Agency's primary
drinking water standards, what is the maximum contaminant level for
alpha particles? Correct Answers 15 pCi/L
What term refers to the highest level of a disinfectant allowed in
drinking water? Correct Answers Maximum residual disinfectant level
(MRDL)
What is the maximum contaminant level for arsenic? Correct Answers
10 µg/L
What is plotted on the horizontal scale (x-axis) of a pump curve? Correct
Answers Capacity (flow rate)
The ___ is the outlet, or high-pressure, side of a pump. Correct Answers
discharge side
What is the term for the amount of energy used by water in moving from
one location to another? Correct Answers Head loss
What is the formula for calculating chlorine demand? Correct Answers
Chlorine dosage = chlorine demand + chlorine residual
How is the wire-to-water efficiency obtained? Correct Answers By
calculating the ratio of electrical power input to hydraulic power output
LATEST UPDATED (QUESTIONS AND ANSWERS) ALREADY
PASSED!
If a water system collects at least 40 samples per month for the analyses
of total coliforms, what percentage of total coliform positive samples are
acceptable for the system to remain in compliance with the maximum
contaminant level for total coliforms? Correct Answers No more than
5%
Water systems are required to achieve at least ___ removal and/or
inactivation of viruses between a point where the raw water is not
subject to recontamination by surface water runoff and a point
downstream before or at the first customer. Correct Answers 4 log
Continuous chlorine residual monitoring is required where the water
enters the distribution system under the Surface Water Treatment Rule
when the Correct Answers population served is >3,300 people.
A community water system must post the Consumer Confidence Report
on a publicly accessible website if it serves more than Correct Answers
100,000 people.
Public water systems that cannot meet the required removal of total
organic compounds (TOCs) can comply if the source-water TOC level
is, calculated quarterly as a running annual average. Correct Answers
<2.0 mg/L
,The Surface Water Treatment Rule does not specify which of the
following treatment technology? Correct Answers Chloramine
disinfection
A regulated organic contaminant concentration that exceeds the MCL
Correct Answers is a Tier 2 violation requiring public notification within
30 days.
Operators must balance satisfying regulations on the amount of certain
chlorinated organic compounds with meeting disinfection limits. Correct
Answers
A water system using conventional filtration treatment does not have to
use enhanced coagulation to achieve the total organic carbon (TOC)
removal if Correct Answers the treated water quarterly running average
TOC is less than 2.0 mg/L.
Regulations that govern US water supply and treatment are developed
by the US Environmental Protection Agency under what act? Correct
Answers Safe Drinking Water Act (SDWA)
According to the US Environmental Protection Agency's primary
drinking water standards, what is the maximum contaminant level goal
for copper? Correct Answers 1.3 mg/L
, According to the US Environmental Protection Agency's primary
drinking water standards, what is the maximum contaminant level for
alpha particles? Correct Answers 15 pCi/L
What term refers to the highest level of a disinfectant allowed in
drinking water? Correct Answers Maximum residual disinfectant level
(MRDL)
What is the maximum contaminant level for arsenic? Correct Answers
10 µg/L
What is plotted on the horizontal scale (x-axis) of a pump curve? Correct
Answers Capacity (flow rate)
The ___ is the outlet, or high-pressure, side of a pump. Correct Answers
discharge side
What is the term for the amount of energy used by water in moving from
one location to another? Correct Answers Head loss
What is the formula for calculating chlorine demand? Correct Answers
Chlorine dosage = chlorine demand + chlorine residual
How is the wire-to-water efficiency obtained? Correct Answers By
calculating the ratio of electrical power input to hydraulic power output
