Texas Well Driller License Practice Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf
1. What is the minimum depth for a sanitary well seal in Texas for a
domestic well?
a) 5 feet
b) 10 feet
c) 15 feet
d) 20 feet
A sanitary seal must extend at least 10 feet to prevent contamination
of groundwater.
2. Which agency regulates water well drillers in Texas?
a) Texas Department of Health
b) Texas Commission on Environmental Quality (TCEQ)
c) Texas Department of Licensing and Regulation (TDLR)
d) Texas Water Development Board
TDLR is responsible for licensing and regulating well drillers and
pump installers in Texas.
3. A well screen is typically used to:
a) Prevent water flow
, b) Filter out sand and debris
c) Increase water pressure
d) Seal the casing
Well screens prevent sediment from entering the well while allowing
water to flow in.
4. Grout in a well is primarily used for:
a) Sealing the top cap
b) Supporting the casing
c) Preventing contamination from surface water
d) Filtering water
Grout seals the annular space and prevents surface contaminants
from entering the aquifer.
5. What is the required diameter for the annular space when using
bentonite or cement?
a) 0.5 inch
b) 1.5 inches
c) 3 inches
d) 4 inches
A minimum of 1.5 inches is required for effective sealing with grout.
6. The driller must submit a well report to TDLR within how many days of
completion?
a) 15 days
b) 30 days
c) 45 days
d) 60 days
Well completion reports must be filed within 60 days as per TAC
regulations.
7. Which of the following is a legal requirement before starting well
drilling on a new property?
, a) TCEQ inspection
b) Landowner’s written consent
c) County permit
d) Hydrological survey
A driller must have the landowner’s permission to drill a well on
private property.
8. A collapsed casing is typically caused by:
a) Cold weather
b) Improper sealant
c) Overburden pressure and poor installation
d) Air pockets
Incorrect installation and subsurface pressure can lead to casing
failure.
9. Which of the following is considered an acceptable grout material in
Texas?
a) Bentonite
b) Neat cement
c) Both a and b
d) Sand
Only bentonite and neat cement are approved materials for
grouting.
10. What is the purpose of a pitless adapter?
a) Increase pressure
b) Prevent backflow
c) Allow horizontal water discharge below frost line
d) Seal the casing top
A pitless adapter allows for a sealed, sanitary connection to water
lines below frost level.
Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf
1. What is the minimum depth for a sanitary well seal in Texas for a
domestic well?
a) 5 feet
b) 10 feet
c) 15 feet
d) 20 feet
A sanitary seal must extend at least 10 feet to prevent contamination
of groundwater.
2. Which agency regulates water well drillers in Texas?
a) Texas Department of Health
b) Texas Commission on Environmental Quality (TCEQ)
c) Texas Department of Licensing and Regulation (TDLR)
d) Texas Water Development Board
TDLR is responsible for licensing and regulating well drillers and
pump installers in Texas.
3. A well screen is typically used to:
a) Prevent water flow
, b) Filter out sand and debris
c) Increase water pressure
d) Seal the casing
Well screens prevent sediment from entering the well while allowing
water to flow in.
4. Grout in a well is primarily used for:
a) Sealing the top cap
b) Supporting the casing
c) Preventing contamination from surface water
d) Filtering water
Grout seals the annular space and prevents surface contaminants
from entering the aquifer.
5. What is the required diameter for the annular space when using
bentonite or cement?
a) 0.5 inch
b) 1.5 inches
c) 3 inches
d) 4 inches
A minimum of 1.5 inches is required for effective sealing with grout.
6. The driller must submit a well report to TDLR within how many days of
completion?
a) 15 days
b) 30 days
c) 45 days
d) 60 days
Well completion reports must be filed within 60 days as per TAC
regulations.
7. Which of the following is a legal requirement before starting well
drilling on a new property?
, a) TCEQ inspection
b) Landowner’s written consent
c) County permit
d) Hydrological survey
A driller must have the landowner’s permission to drill a well on
private property.
8. A collapsed casing is typically caused by:
a) Cold weather
b) Improper sealant
c) Overburden pressure and poor installation
d) Air pockets
Incorrect installation and subsurface pressure can lead to casing
failure.
9. Which of the following is considered an acceptable grout material in
Texas?
a) Bentonite
b) Neat cement
c) Both a and b
d) Sand
Only bentonite and neat cement are approved materials for
grouting.
10. What is the purpose of a pitless adapter?
a) Increase pressure
b) Prevent backflow
c) Allow horizontal water discharge below frost line
d) Seal the casing top
A pitless adapter allows for a sealed, sanitary connection to water
lines below frost level.
