NGWA Water Systems Certification Exam
(Less Than 100 GPM – Exam K) Questions
And Correct Answers (Verified Answers)
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1. The primary purpose of a pressure tank in a small water system is
to
A. increase water temperature
B. store chemicals
C. reduce pump cycling
D. remove sediment
Answer: C
Pressure tanks maintain system pressure and reduce frequent
pump starts.
2. A well producing less than 100 GPM is typically classified as a
A. community system
B. large-capacity well
C. small water system
D. surface water source
Answer: C
Wells under 100 GPM are generally considered small water
systems.
,3. The most common pump used in deep wells is a
A. centrifugal pump
B. jet pump
C. submersible pump
D. piston pump
Answer: C
Submersible pumps are designed to operate underwater at
greater depths.
4. Static water level refers to the
A. water level during pumping
B. depth of the pump
C. natural water level when not pumping
D. maximum drawdown level
Answer: C
Static level is measured when the well is at rest.
5. Drawdown is defined as the
A. pump intake depth
B. difference between static and pumping water levels
C. total well depth
D. casing length
Answer: B
Drawdown shows how much the water level drops during
pumping.
6. A sanitary well seal is used to
A. increase well yield
B. prevent surface contamination
C. improve pump efficiency
, D. support the drop pipe
Answer: B
Sanitary seals block contaminants from entering the well.
7. Disinfection of a new well is commonly done using
A. fluoride
B. ammonia
C. chlorine
D. peroxide
Answer: C
Chlorine is the standard disinfectant for wells.
8. A water sample for bacteriological testing should be collected
A. from a hose bib with a hose attached
B. directly from the well casing
C. after flushing the tap
D. before system start-up
Answer: C
Flushing removes stagnant water for accurate results.
9. The purpose of a check valve is to
A. increase pressure
B. control flow direction
C. filter debris
D. regulate voltage
Answer: B
Check valves prevent backflow.
10. Total head includes
A. only vertical lift
B. friction losses only
(Less Than 100 GPM – Exam K) Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. The primary purpose of a pressure tank in a small water system is
to
A. increase water temperature
B. store chemicals
C. reduce pump cycling
D. remove sediment
Answer: C
Pressure tanks maintain system pressure and reduce frequent
pump starts.
2. A well producing less than 100 GPM is typically classified as a
A. community system
B. large-capacity well
C. small water system
D. surface water source
Answer: C
Wells under 100 GPM are generally considered small water
systems.
,3. The most common pump used in deep wells is a
A. centrifugal pump
B. jet pump
C. submersible pump
D. piston pump
Answer: C
Submersible pumps are designed to operate underwater at
greater depths.
4. Static water level refers to the
A. water level during pumping
B. depth of the pump
C. natural water level when not pumping
D. maximum drawdown level
Answer: C
Static level is measured when the well is at rest.
5. Drawdown is defined as the
A. pump intake depth
B. difference between static and pumping water levels
C. total well depth
D. casing length
Answer: B
Drawdown shows how much the water level drops during
pumping.
6. A sanitary well seal is used to
A. increase well yield
B. prevent surface contamination
C. improve pump efficiency
, D. support the drop pipe
Answer: B
Sanitary seals block contaminants from entering the well.
7. Disinfection of a new well is commonly done using
A. fluoride
B. ammonia
C. chlorine
D. peroxide
Answer: C
Chlorine is the standard disinfectant for wells.
8. A water sample for bacteriological testing should be collected
A. from a hose bib with a hose attached
B. directly from the well casing
C. after flushing the tap
D. before system start-up
Answer: C
Flushing removes stagnant water for accurate results.
9. The purpose of a check valve is to
A. increase pressure
B. control flow direction
C. filter debris
D. regulate voltage
Answer: B
Check valves prevent backflow.
10. Total head includes
A. only vertical lift
B. friction losses only
