COLORADO WATER WELL CONSTRUCTION
CNTRACTOR LICENSING EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a water well casing?
A. Increase water pressure
B. Prevent collapse of the borehole and protect water quality
C. Increase drilling speed
D. Store groundwater
Correct Answer: B
Rationale: The casing stabilizes the borehole and prevents
contamination from surface or shallow groundwater sources.
2. Which agency regulates water well construction in
Colorado?
A. EPA only
B. Colorado Division of Water Resources
C. OSHA
D. Department of Transportation
Correct Answer: B
Rationale: The Colorado Division of Water Resources (State
Engineer’s Office) regulates well permitting and construction
standards.
,3. What is the main purpose of grouting a well?
A. Increase pump efficiency
B. Seal the annular space to prevent contamination
C. Strengthen the pump shaft
D. Improve drilling speed
Correct Answer: B
Rationale: Grouting prevents surface water and contaminants
from entering the aquifer through the annular space.
4. Which drilling method uses a rotating bit and drilling fluid?
A. Cable tool drilling
B. Rotary drilling
C. Jet drilling
D. Auger drilling
Correct Answer: B
Rationale: Rotary drilling uses a rotating bit and drilling fluid
(mud or air) to remove cuttings.
5. What is the purpose of a well screen?
A. Increase casing strength
B. Filter sediment while allowing water flow
C. Seal the well permanently
D. Measure water depth
,Correct Answer: B
Rationale: A well screen allows water to enter while preventing
sand and sediment from entering the well.
6. What is the minimum recommended sanitary seal depth for
most wells?
A. 2 feet
B. 5 feet
C. 10 feet
D. 50 feet
Correct Answer: C
Rationale: A minimum of 10 feet of grout or seal is commonly
required to prevent contamination.
7. What is drawdown in a pumping well?
A. Increase in water level
B. Difference between static and pumping water levels
C. Total depth of the well
D. Flow rate of the pump
Correct Answer: B
Rationale: Drawdown is the lowering of the water level during
pumping compared to static conditions.
, 8. Which material is commonly used for well casing in modern
wells?
A. Wood
B. PVC or steel
C. Aluminum foil
D. Copper wire
Correct Answer: B
Rationale: PVC and steel are standard due to durability and
corrosion resistance.
9. What is the purpose of well development?
A. Deepen the borehole
B. Remove fine particles and improve water flow
C. Install casing
D. Cement the well permanently
Correct Answer: B
Rationale: Development improves hydraulic connection
between aquifer and well by removing fines and drilling mud.
10. Which condition indicates possible well contamination?
A. Clear water
B. Sudden drop in pump efficiency
C. Presence of bacteria or nitrates
D. High flow rate
CNTRACTOR LICENSING EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a water well casing?
A. Increase water pressure
B. Prevent collapse of the borehole and protect water quality
C. Increase drilling speed
D. Store groundwater
Correct Answer: B
Rationale: The casing stabilizes the borehole and prevents
contamination from surface or shallow groundwater sources.
2. Which agency regulates water well construction in
Colorado?
A. EPA only
B. Colorado Division of Water Resources
C. OSHA
D. Department of Transportation
Correct Answer: B
Rationale: The Colorado Division of Water Resources (State
Engineer’s Office) regulates well permitting and construction
standards.
,3. What is the main purpose of grouting a well?
A. Increase pump efficiency
B. Seal the annular space to prevent contamination
C. Strengthen the pump shaft
D. Improve drilling speed
Correct Answer: B
Rationale: Grouting prevents surface water and contaminants
from entering the aquifer through the annular space.
4. Which drilling method uses a rotating bit and drilling fluid?
A. Cable tool drilling
B. Rotary drilling
C. Jet drilling
D. Auger drilling
Correct Answer: B
Rationale: Rotary drilling uses a rotating bit and drilling fluid
(mud or air) to remove cuttings.
5. What is the purpose of a well screen?
A. Increase casing strength
B. Filter sediment while allowing water flow
C. Seal the well permanently
D. Measure water depth
,Correct Answer: B
Rationale: A well screen allows water to enter while preventing
sand and sediment from entering the well.
6. What is the minimum recommended sanitary seal depth for
most wells?
A. 2 feet
B. 5 feet
C. 10 feet
D. 50 feet
Correct Answer: C
Rationale: A minimum of 10 feet of grout or seal is commonly
required to prevent contamination.
7. What is drawdown in a pumping well?
A. Increase in water level
B. Difference between static and pumping water levels
C. Total depth of the well
D. Flow rate of the pump
Correct Answer: B
Rationale: Drawdown is the lowering of the water level during
pumping compared to static conditions.
, 8. Which material is commonly used for well casing in modern
wells?
A. Wood
B. PVC or steel
C. Aluminum foil
D. Copper wire
Correct Answer: B
Rationale: PVC and steel are standard due to durability and
corrosion resistance.
9. What is the purpose of well development?
A. Deepen the borehole
B. Remove fine particles and improve water flow
C. Install casing
D. Cement the well permanently
Correct Answer: B
Rationale: Development improves hydraulic connection
between aquifer and well by removing fines and drilling mud.
10. Which condition indicates possible well contamination?
A. Clear water
B. Sudden drop in pump efficiency
C. Presence of bacteria or nitrates
D. High flow rate
