CO Water Well Driller Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf.
1. Which Colorado agency has primary regulatory authority over the
construction, alteration, plugging, and abandonment of most water
wells in the state?
A. Colorado Department of Public Health and Environment
B. Colorado Division of Water Resources
C. Colorado Department of Transportation
D. Colorado Oil and Gas Conservation Commission
B. Colorado Division of Water Resources
The Colorado Division of Water Resources (DWR), within the
Department of Natural Resources, administers Colorado’s water-well
construction and well-driller licensing requirements, including
permitting, construction standards, and abandonment requirements.
2. Before beginning construction of a typical new water well in
Colorado, what authorization is generally required?
A. A building permit from the county only
B. A water court decree in every case
,C. A valid well permit or other authorization issued under Colorado water
law
D. Written approval from the nearest municipality only
C. A valid well permit or other authorization issued under Colorado
water law
Colorado regulates groundwater development through the state’s
water-rights system, and a well generally must have appropriate
authorization before construction begins.
3. What is the primary purpose of a Colorado water well permit?
A. To certify the driller's insurance coverage
B. To authorize the construction and use of a particular well under
specified conditions
C. To establish the market value of the property
D. To replace the driller's professional license
B. To authorize the construction and use of a particular well under
specified conditions
A well permit establishes the legal authorization and conditions under
which a well may be constructed and operated, while the driller's license
establishes the individual's qualification to perform regulated work.
4. Which person is generally responsible for ensuring that regulated
well construction work is performed in accordance with Colorado's
applicable well construction requirements?
,A. Only the property owner
B. Only the county assessor
C. The licensed well construction professional responsible for the work
D. The nearest utility company
C. The licensed well construction professional responsible for the work
The licensed professional performing or supervising regulated well
construction has an important duty to comply with applicable
construction standards, permit conditions, and reporting requirements.
5. What is the principal purpose of installing sanitary well casing and
maintaining an appropriate annular seal?
A. To increase the electrical conductivity of groundwater
B. To prevent unwanted water and contaminants from entering the well
C. To increase drilling penetration speed
D. To eliminate the need for a well cap
B. To prevent unwanted water and contaminants from entering the well
Proper casing and annular sealing protect the well from surface
drainage, contaminated zones, and unintended movement of water
between formations.
6. What is the annular space in a water well?
A. The open space inside the pump column
B. The space between the well casing and the borehole wall
C. The distance between the pump and pressure tank
D. The opening inside the well screen
, B. The space between the well casing and the borehole wall
The annular space surrounds the casing and is commonly filled with
grout or other approved sealing materials to protect groundwater and
stabilize the well construction.
7. Why is grout placed around well casing?
A. Primarily to increase pump horsepower
B. To provide an annular seal and restrict vertical movement of fluids
outside the casing
C. To make the casing electrically conductive
D. To increase the diameter of the well screen
B. To provide an annular seal and restrict vertical movement of fluids
outside the casing
A properly installed grout seal helps prevent contaminants from
migrating downward along the outside of the casing and helps prevent
undesirable hydraulic communication between formations.
8. Which condition presents the greatest concern when a well's
annular space is inadequately sealed?
A. Reduced paint adhesion on the casing
B. Vertical migration of contaminated water along the outside of the
casing
C. Increased pump motor voltage
D. Excessive hardness of the well casing
Questions And Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf.
1. Which Colorado agency has primary regulatory authority over the
construction, alteration, plugging, and abandonment of most water
wells in the state?
A. Colorado Department of Public Health and Environment
B. Colorado Division of Water Resources
C. Colorado Department of Transportation
D. Colorado Oil and Gas Conservation Commission
B. Colorado Division of Water Resources
The Colorado Division of Water Resources (DWR), within the
Department of Natural Resources, administers Colorado’s water-well
construction and well-driller licensing requirements, including
permitting, construction standards, and abandonment requirements.
2. Before beginning construction of a typical new water well in
Colorado, what authorization is generally required?
A. A building permit from the county only
B. A water court decree in every case
,C. A valid well permit or other authorization issued under Colorado water
law
D. Written approval from the nearest municipality only
C. A valid well permit or other authorization issued under Colorado
water law
Colorado regulates groundwater development through the state’s
water-rights system, and a well generally must have appropriate
authorization before construction begins.
3. What is the primary purpose of a Colorado water well permit?
A. To certify the driller's insurance coverage
B. To authorize the construction and use of a particular well under
specified conditions
C. To establish the market value of the property
D. To replace the driller's professional license
B. To authorize the construction and use of a particular well under
specified conditions
A well permit establishes the legal authorization and conditions under
which a well may be constructed and operated, while the driller's license
establishes the individual's qualification to perform regulated work.
4. Which person is generally responsible for ensuring that regulated
well construction work is performed in accordance with Colorado's
applicable well construction requirements?
,A. Only the property owner
B. Only the county assessor
C. The licensed well construction professional responsible for the work
D. The nearest utility company
C. The licensed well construction professional responsible for the work
The licensed professional performing or supervising regulated well
construction has an important duty to comply with applicable
construction standards, permit conditions, and reporting requirements.
5. What is the principal purpose of installing sanitary well casing and
maintaining an appropriate annular seal?
A. To increase the electrical conductivity of groundwater
B. To prevent unwanted water and contaminants from entering the well
C. To increase drilling penetration speed
D. To eliminate the need for a well cap
B. To prevent unwanted water and contaminants from entering the well
Proper casing and annular sealing protect the well from surface
drainage, contaminated zones, and unintended movement of water
between formations.
6. What is the annular space in a water well?
A. The open space inside the pump column
B. The space between the well casing and the borehole wall
C. The distance between the pump and pressure tank
D. The opening inside the well screen
, B. The space between the well casing and the borehole wall
The annular space surrounds the casing and is commonly filled with
grout or other approved sealing materials to protect groundwater and
stabilize the well construction.
7. Why is grout placed around well casing?
A. Primarily to increase pump horsepower
B. To provide an annular seal and restrict vertical movement of fluids
outside the casing
C. To make the casing electrically conductive
D. To increase the diameter of the well screen
B. To provide an annular seal and restrict vertical movement of fluids
outside the casing
A properly installed grout seal helps prevent contaminants from
migrating downward along the outside of the casing and helps prevent
undesirable hydraulic communication between formations.
8. Which condition presents the greatest concern when a well's
annular space is inadequately sealed?
A. Reduced paint adhesion on the casing
B. Vertical migration of contaminated water along the outside of the
casing
C. Increased pump motor voltage
D. Excessive hardness of the well casing
