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WATER DISTRIBUTION LEVEL 2 EXAM
2025 LATEST QUESTIONS AND ANSWERS
GRADED A+
What do water distribution system operators have the responsibility for?
The health and well-being of the community they serve
Frequently the water supplier tries to maintain specific minimum target __________________ throughput the distribution system.
Water pressure (20 PSI minimum)
All trenches and excavations are unsafe until...
Proper shoring, used, and back filled
Can the quality of water coming out of the consumers tap can be affected by what happens to the water as it travels through the consumers own system?
Yes
Biofilms will grow more easily on materials that supply...
Nutrients
Operators should be required to follow a prepared _________ schedule and document the work they do
PM (preventative maintenance)
A lack of chlorine residual in a distribution system could indicate?
The presence of heavy contamination
What is necessary to do when a new well, pump, or screen is completed
Disinfect
The chlorine injection should never be due to causing corrosion problems
On the intake side of the pump
What must be done before excavation can begin?
Fined, sentenced to jail, barred from working
What is the operators most important responsibility with regards to safety?
Following safety procedures
What is the main purpose of a water storage facility?
To provide a sufficient amount of water to average or equalize the daily demands
What is the purpose of surge tanks?
To control water hammer
Why should all storage facilities be sampled regular?
To determine the quality or the water that enters and leaves the facility?
Why is backflow a concern for water distribution system operators?
Flow from non potable source could contaminate distribution system
Why can air because a problem in a water main?
Air can collect and stop the flow of water completely
What is a cross-connection?
Unprotected connection between a drinking water supply and a system NOT approved as safe.
AD
What is back pressure?
Backflow caused when the users water system pressure is higher than the public system
Which type of corrosion-control inhibitor may stimulate bacterial growth?
Phosphate-based product
What is the main objective of distribution system maintenance?
Provide maximum continuous equipment service at the lowest possible cost.
What is the chlorine dose?
Chlorine demand plus chlorine residual
What is the one objective of a safety program?
To prevent accidents
AD
What should an operator do if the operator can not remove a safety hazard?
Call hazard to attention of those who have authority to remove hazard
What is the basic requirement for an enclosed guard?
Prevent hands and arms from making contact with dangerous moving parts
In water distribution systems what is the primary concern when entering a confined space?
oxygen deficiency
What is the meaning of accountability
When an operator ensures that the manager is informed of results or events
The selection method and examination process used to evaluate applicants must be limited to which areas?
Applicants knowledge, skills, and abilities to preform job-related activities
What is the purpose of a distribution system O & M program?
To ensure that the system performs as designed and intended
If contamination of a water supply is discovered, what is the most important immediate concern?
Safety of the public
What are the responsibilities of water distribution system operators?
-deliver safe pleasant drinking water
- make sure adequate amount of water and pressure are available during emergencies
Which of the following items are possible causes of rates and odors in storage tanks and distribution systems?
Algal growth
Dead ends
High chlorine residual
What causes water hammer
Operating valves to quickly
Rapid increase or decrease in water flow
Turning pumps on and off
Which factors influence distribution system preformance
Demands of water
Fire
Potential service interruption
Protection against unauthorized entry
Quality of the water supply
Why are thrust blocks installed
To prevent leakage
To prevent separation of joints
What is the most positive type of backflow prevention available?
Air gap devices
When is a domestic water supply consider led to be of good quality?
Attractive taste and appearance
Distributed without undue corrosiveness
Cree of disease
Free of toxic chemicals
What of the following inorganic substances can be found in water?
Arsenic, lead, mercury, nitrate
Which of the following factors may cause water quality degradation in water distribution systems?
Biological growth
Corrosion
Cross connections
Which of the following backflow prevention devices are approved for use at service connections?
Air gap separation
Double check valve
Reduces pressure principle device
Which factors can cause a loss of water carrying capacity
Corrosion
Deposition of sediment
Putting
Slime growth
Tuberculation
When does a field disinfection of distribution system mains and storage reservoirs become necessary
After repairs are made
When they are new
Whenever there is any possible of contamination
Which of the following factors influence disinfection?
Organic matter
PH
Temperature
Turbidity
Which types of disinfectants are used to disinfect water that is delivered to consumers
Free chlorine
Monochloramine
