CDPH Water Distribution Grade 2 Latest(2024/2025) Questions and Answers 100% Correct.
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Course
CDPH Water Distribution Grade 2
Institution
CDPH Water Distribution Grade 2
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 - a.) 1
Which is pipe strength expressed in?
a.) Hydrostatic potential
b.) Psi and durability
c.) Tensile and flexural strength
d.) Baud units - c.) Tensile...
CDPH Water Distribution Grade 2
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 - a.) 1
Which is pipe strength expressed in?
a.) Hydrostatic potential
b.) Psi and durability
c.) Tensile and flexural strength
d.) Baud units - c.) Tensile and flexural strength
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 - 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 - 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% - 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 - 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 - 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 - 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 - c.) Send all analysis results to the State
periodically
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
d.) Photographed so that mapping can be avoided until the system is complete - b.) Filled with a
solution of 25ppm to 50ppm free chlorine for at least 24 hours prior to flushing
What chlorine concentration should be produced when disinfecting a well or well pump?
a.) 25 mg/L
b.) 50 mg/L
c.) 75 mg/L
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