Texas Well Driller License practice Exam
With Actual Questions,Rationales And
Verified Answers/Expert Verified For
Guaranteed Pass2025/2026 /Latest
Update/Instant Download Pdf
1. The Texas Well Driller and Pump Installer program is regulated by which agency?
a) Texas Commission on Environmental Quality (TCEQ)
b) Texas Department of Licensing and Regulation (TDLR)
c) Texas Water Development Board (TWDB)
d) Texas Railroad Commission
Answer: b
Rationale: TDLR administers the licensing, regulation, and enforcement of well
drillers and pump installers in Texas.
2. The Texas Water Well Drillers Act was passed in which year?
a) 1955
b) 1969
c) 1985
d) 1993
Answer: b
Rationale: The Water Well Drillers Act was passed in 1969 to regulate well drilling
and ensure water protection.
3. A driller must notify TDLR within how many days of changing their business address?
a) 10 days
b) 15 days
c) 30 days
d) 60 days
Answer: a
Rationale: Licensees are required to notify TDLR of address changes within 10 days.
Section B: Well Construction & Plugging
, 4. The minimum surface casing depth in most Texas wells is required to extend at least:
a) 10 feet below surface
b) 20 feet below surface
c) 25 feet below surface
d) To the first water-bearing formation
Answer: c
Rationale: Texas rules generally require casing to extend at least 25 feet below land
surface or into the first confining layer.
5. Annular space around casing must be filled with:
a) Bentonite or cement grout
b) Sand
c) Gravel
d) Native soil
Answer: a
Rationale: Proper grouting with bentonite or cement prevents contamination.
6. When plugging a well, the material must be placed:
a) Only in the top 10 feet
b) In the annular space only
c) From the bottom to the top of the well
d) Only at water-bearing zones
Answer: c
Rationale: Plugging must fill from bottom to surface to prevent vertical movement
of water.
Section C: Groundwater & Geology
7. Which Texas aquifer is the largest in volume and water use?
a) Carrizo-Wilcox
b) Trinity
c) Ogallala
d) Edwards
Answer: c
Rationale: The Ogallala is the largest aquifer in Texas and provides irrigation water
across the High Plains.
8. A confined aquifer is best described as one that:
a) Has a water table at the surface
b) Is overlain by an impermeable layer
c) Produces artesian wells only
d) Contains only saline water
, Answer: b
Rationale: Confined aquifers are under pressure due to impermeable layers above
them.
Section D: Safety & Drilling Practices
9. The primary purpose of drilling mud is to:
a) Add weight to casing
b) Cool and lubricate the bit
c) Prevent blowouts only
d) Reduce drilling costs
Answer: b
Rationale: Drilling fluid cools/lubricates the bit, removes cuttings, and stabilizes the
borehole.
10. Before working near overhead powerlines with drilling equipment, OSHA requires
maintaining a minimum clearance of:
a) 5 feet
b) 10 feet
c) 15 feet
d) 20 feet
Answer: b
Rationale: A 10-foot minimum clearance is required for safety.
Well Construction & Plugging
11. The primary purpose of surface casing in a water well is:
a) To strengthen the borehole
b) To protect freshwater zones from contamination
c) To increase pumping efficiency
d) To reduce drilling costs
Answer: b
Rationale: Surface casing is required to protect freshwater aquifers from pollution
and cross-contamination.
12. What is the minimum required thickness of a bentonite seal when placed above a
gravel pack?
a) 1 foot
b) 2 feet
c) 5 feet
d) 10 feet
Answer: c
With Actual Questions,Rationales And
Verified Answers/Expert Verified For
Guaranteed Pass2025/2026 /Latest
Update/Instant Download Pdf
1. The Texas Well Driller and Pump Installer program is regulated by which agency?
a) Texas Commission on Environmental Quality (TCEQ)
b) Texas Department of Licensing and Regulation (TDLR)
c) Texas Water Development Board (TWDB)
d) Texas Railroad Commission
Answer: b
Rationale: TDLR administers the licensing, regulation, and enforcement of well
drillers and pump installers in Texas.
2. The Texas Water Well Drillers Act was passed in which year?
a) 1955
b) 1969
c) 1985
d) 1993
Answer: b
Rationale: The Water Well Drillers Act was passed in 1969 to regulate well drilling
and ensure water protection.
3. A driller must notify TDLR within how many days of changing their business address?
a) 10 days
b) 15 days
c) 30 days
d) 60 days
Answer: a
Rationale: Licensees are required to notify TDLR of address changes within 10 days.
Section B: Well Construction & Plugging
, 4. The minimum surface casing depth in most Texas wells is required to extend at least:
a) 10 feet below surface
b) 20 feet below surface
c) 25 feet below surface
d) To the first water-bearing formation
Answer: c
Rationale: Texas rules generally require casing to extend at least 25 feet below land
surface or into the first confining layer.
5. Annular space around casing must be filled with:
a) Bentonite or cement grout
b) Sand
c) Gravel
d) Native soil
Answer: a
Rationale: Proper grouting with bentonite or cement prevents contamination.
6. When plugging a well, the material must be placed:
a) Only in the top 10 feet
b) In the annular space only
c) From the bottom to the top of the well
d) Only at water-bearing zones
Answer: c
Rationale: Plugging must fill from bottom to surface to prevent vertical movement
of water.
Section C: Groundwater & Geology
7. Which Texas aquifer is the largest in volume and water use?
a) Carrizo-Wilcox
b) Trinity
c) Ogallala
d) Edwards
Answer: c
Rationale: The Ogallala is the largest aquifer in Texas and provides irrigation water
across the High Plains.
8. A confined aquifer is best described as one that:
a) Has a water table at the surface
b) Is overlain by an impermeable layer
c) Produces artesian wells only
d) Contains only saline water
, Answer: b
Rationale: Confined aquifers are under pressure due to impermeable layers above
them.
Section D: Safety & Drilling Practices
9. The primary purpose of drilling mud is to:
a) Add weight to casing
b) Cool and lubricate the bit
c) Prevent blowouts only
d) Reduce drilling costs
Answer: b
Rationale: Drilling fluid cools/lubricates the bit, removes cuttings, and stabilizes the
borehole.
10. Before working near overhead powerlines with drilling equipment, OSHA requires
maintaining a minimum clearance of:
a) 5 feet
b) 10 feet
c) 15 feet
d) 20 feet
Answer: b
Rationale: A 10-foot minimum clearance is required for safety.
Well Construction & Plugging
11. The primary purpose of surface casing in a water well is:
a) To strengthen the borehole
b) To protect freshwater zones from contamination
c) To increase pumping efficiency
d) To reduce drilling costs
Answer: b
Rationale: Surface casing is required to protect freshwater aquifers from pollution
and cross-contamination.
12. What is the minimum required thickness of a bentonite seal when placed above a
gravel pack?
a) 1 foot
b) 2 feet
c) 5 feet
d) 10 feet
Answer: c
