CDPH Water Distribution Grade 2 Exam
Questions and Answers 100% Accurate
What term is used when a water utility divides its total operating expenses into the
total revenue?
a.) Debt ratio
b.) Operating ratio
c.) Credit ratio
d.) Coverage ratio - ANSWER-b.) Operating ratio
Under the requirements of the Safe Drinking Water Act, it is the duty of the water
purveyor to deliver potable water of proper quality only as far as the:
a.) Entry point of the distribution system
b.) Customer's curb box and service connection
c.) Consumer's tap inside the home
d.) Furthest water main blow-off or sampling point - ANSWER-c.) Consumer's tap
inside the home
According to the USEPA drinking water regulations, the owner or operator of a public
water system which fails to comply with applicable monitoring requirements must
give public notice within:
a.) 45 days of the violation by posting a notice at the town hall
b.) 1 year of the violation by including a letter with the water bill
c.) 3 months of the violation in a daily newspaper in the area served by the system
d.) 1 week of the violation in a letter hand delivered to customers - ANSWER-c.) 3
months of the violation in a daily newspaper in the area served by the system
A mixture of air and gas is considered hazardous when the mixture exceeds what
percentage of the lower explosive limit (LEL)?
a.) 0%
b.) 3%
c.) 7%
d.) 10% - ANSWER-d.) 10%
Which of the following duties should not be performed by a small system operator?
a.) Disinfect water mains
b.) Observe pump motors to detect unusual noises, vibrations, or excessive heat
c.) Repair and overhaul chlorinators
, d.) Wire pump, compressors and electrical components of the water system -
ANSWER-d.) Wire pump, compressors and electrical components of the water
system
Which form of hypochlorite is the most dangerous to handle?
a.) Sodium
b.) Fluoride
c.) Calcium
d.) Chlorine - ANSWER-c.) Calcium
What type of fire extinguisher should be used for fires with live electricity present?
a.) Class A
b.) Class B
c.) Class C
d.) Class D - ANSWER-c.) Class C
To ensure that the water supplied by a public water system meets federal and state
requirements, the water system operator must regularly collect samples and:
a.) Test the water at the nearest water testing laboratory
b.) Determine a sampling schedule based on the lab's recommendations
c.) Send all analysis results to the State periodically
d.) Count the number of active wells in the system - ANSWER-c.) Send all analysis
results to the State periodically
How many coliform samples are required per month for a water system serving a
population between 25 and 100?
a.) 1
b.) 2
c.) 3
d.) 4 - ANSWER-a.) 1
What test method best determines chemical feed/dosage rates?
a.) Jar
b.) Turbidity
c.) Hammer
d.) Hardness - ANSWER-a.) Jar
After a new water mains is installed and pressure tested it should be:
a.) Flushed with clean water for 24 hours and put into service
b.) Filled with a solution of 25ppm to 50ppm free chlorine for at least 24 hours prior
to flushing
c.) Filled with clean water and allowed to sit for 5 days at full pressure before turning
the water into the system
Questions and Answers 100% Accurate
What term is used when a water utility divides its total operating expenses into the
total revenue?
a.) Debt ratio
b.) Operating ratio
c.) Credit ratio
d.) Coverage ratio - ANSWER-b.) Operating ratio
Under the requirements of the Safe Drinking Water Act, it is the duty of the water
purveyor to deliver potable water of proper quality only as far as the:
a.) Entry point of the distribution system
b.) Customer's curb box and service connection
c.) Consumer's tap inside the home
d.) Furthest water main blow-off or sampling point - ANSWER-c.) Consumer's tap
inside the home
According to the USEPA drinking water regulations, the owner or operator of a public
water system which fails to comply with applicable monitoring requirements must
give public notice within:
a.) 45 days of the violation by posting a notice at the town hall
b.) 1 year of the violation by including a letter with the water bill
c.) 3 months of the violation in a daily newspaper in the area served by the system
d.) 1 week of the violation in a letter hand delivered to customers - ANSWER-c.) 3
months of the violation in a daily newspaper in the area served by the system
A mixture of air and gas is considered hazardous when the mixture exceeds what
percentage of the lower explosive limit (LEL)?
a.) 0%
b.) 3%
c.) 7%
d.) 10% - ANSWER-d.) 10%
Which of the following duties should not be performed by a small system operator?
a.) Disinfect water mains
b.) Observe pump motors to detect unusual noises, vibrations, or excessive heat
c.) Repair and overhaul chlorinators
, d.) Wire pump, compressors and electrical components of the water system -
ANSWER-d.) Wire pump, compressors and electrical components of the water
system
Which form of hypochlorite is the most dangerous to handle?
a.) Sodium
b.) Fluoride
c.) Calcium
d.) Chlorine - ANSWER-c.) Calcium
What type of fire extinguisher should be used for fires with live electricity present?
a.) Class A
b.) Class B
c.) Class C
d.) Class D - ANSWER-c.) Class C
To ensure that the water supplied by a public water system meets federal and state
requirements, the water system operator must regularly collect samples and:
a.) Test the water at the nearest water testing laboratory
b.) Determine a sampling schedule based on the lab's recommendations
c.) Send all analysis results to the State periodically
d.) Count the number of active wells in the system - ANSWER-c.) Send all analysis
results to the State periodically
How many coliform samples are required per month for a water system serving a
population between 25 and 100?
a.) 1
b.) 2
c.) 3
d.) 4 - ANSWER-a.) 1
What test method best determines chemical feed/dosage rates?
a.) Jar
b.) Turbidity
c.) Hammer
d.) Hardness - ANSWER-a.) Jar
After a new water mains is installed and pressure tested it should be:
a.) Flushed with clean water for 24 hours and put into service
b.) Filled with a solution of 25ppm to 50ppm free chlorine for at least 24 hours prior
to flushing
c.) Filled with clean water and allowed to sit for 5 days at full pressure before turning
the water into the system
