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Texas Well Driller License EXAM Questions and Correct
Answers with EXPLANATIONS LATEST THIS YEAR
Summarized Exam Coverage (Texas Well Driller License)
The exam tests Texas laws and TDLR rules, well construction standards, casing and grouting
requirements, drilling methods (rotary, cable tool, auger), pump systems, groundwater protection, well
spacing and setbacks, well plugging and abandonment, site safety, and well completion reporting.
1. A driller begins constructing a water well without obtaining required permits from the local
groundwater conservation district. What is the most likely consequence?
A) No consequence if the well is shallow
B) Immediate license upgrade
C) Violation subject to penalties and possible license suspension
D) Only a verbal warning
Answer: C
Texas law requires permits before drilling; unpermitted work violates TDLR rules and can result in fines or
license suspension .
2. Which Texas agency is responsible for licensing water well drillers and pump installers?
A) Texas Commission on Environmental Quality (TCEQ)
B) Texas Department of Licensing and Regulation (TDLR)
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C) Texas Water Development Board (TWDB)
D) Railroad Commission of Texas
Answer: B
TDLR administers the Well Driller Licensing Program under Texas Occupations Code Chapter 1902 and 16
TAC Chapter 76 .
3. While drilling, a contractor encounters a confined aquifer under artesian pressure. What is the most
appropriate immediate action?
A) Continue drilling faster to release pressure
B) Install proper casing and seal the aquifer zone to prevent uncontrolled flow
C) Abandon the hole immediately
D) Pump water out until pressure drops
Answer: B
Confined aquifers must be isolated with casing and seals to prevent cross-contamination and
uncontrolled artesian flow .
4. What is the minimum age requirement to obtain a Texas Well Driller license?
A) 16 years
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B) 18 years
C) 21 years
D) 25 years
Answer: B
Texas Occupations Code §1902.102 requires applicants to be at least 18 years of age .
5. A drilling crew fails to disinfect a newly constructed well before use. What risk does this create?
A) Structural collapse of the borehole
B) Electrical hazard for the pump
C) Biological contamination of the water supply
D) Reduced water pressure
Answer: C
Disinfection removes bacteria introduced during drilling; failure can result in coliform or other pathogen
contamination .
6. What is the minimum passing grade for the Texas Well Driller licensing examination?
A) 60%
B) 70%
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C) 75%
D) 80%
Answer: B
Texas Administrative Code Section 76.23 explicitly states a passing grade of 70% .
7. While calculating annular volume for grouting, a driller miscalculates the borehole diameter. What is
the likely consequence?
A) Overuse or underuse of sealing materials, compromising the seal
B) Faster drilling progress
C) Reduced labor cost
D) Increased pump efficiency
Answer: A
Incorrect volume leads to improper sealing with voids or insufficient grout, risking contamination
pathways .
8. Which license class authorizes drilling of water wells, monitoring wells, and performing well repairs in
Texas?
A) Water Well Driller
Texas Well Driller License EXAM Questions and Correct
Answers with EXPLANATIONS LATEST THIS YEAR
Summarized Exam Coverage (Texas Well Driller License)
The exam tests Texas laws and TDLR rules, well construction standards, casing and grouting
requirements, drilling methods (rotary, cable tool, auger), pump systems, groundwater protection, well
spacing and setbacks, well plugging and abandonment, site safety, and well completion reporting.
1. A driller begins constructing a water well without obtaining required permits from the local
groundwater conservation district. What is the most likely consequence?
A) No consequence if the well is shallow
B) Immediate license upgrade
C) Violation subject to penalties and possible license suspension
D) Only a verbal warning
Answer: C
Texas law requires permits before drilling; unpermitted work violates TDLR rules and can result in fines or
license suspension .
2. Which Texas agency is responsible for licensing water well drillers and pump installers?
A) Texas Commission on Environmental Quality (TCEQ)
B) Texas Department of Licensing and Regulation (TDLR)
, Page 2 of 121
C) Texas Water Development Board (TWDB)
D) Railroad Commission of Texas
Answer: B
TDLR administers the Well Driller Licensing Program under Texas Occupations Code Chapter 1902 and 16
TAC Chapter 76 .
3. While drilling, a contractor encounters a confined aquifer under artesian pressure. What is the most
appropriate immediate action?
A) Continue drilling faster to release pressure
B) Install proper casing and seal the aquifer zone to prevent uncontrolled flow
C) Abandon the hole immediately
D) Pump water out until pressure drops
Answer: B
Confined aquifers must be isolated with casing and seals to prevent cross-contamination and
uncontrolled artesian flow .
4. What is the minimum age requirement to obtain a Texas Well Driller license?
A) 16 years
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B) 18 years
C) 21 years
D) 25 years
Answer: B
Texas Occupations Code §1902.102 requires applicants to be at least 18 years of age .
5. A drilling crew fails to disinfect a newly constructed well before use. What risk does this create?
A) Structural collapse of the borehole
B) Electrical hazard for the pump
C) Biological contamination of the water supply
D) Reduced water pressure
Answer: C
Disinfection removes bacteria introduced during drilling; failure can result in coliform or other pathogen
contamination .
6. What is the minimum passing grade for the Texas Well Driller licensing examination?
A) 60%
B) 70%
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C) 75%
D) 80%
Answer: B
Texas Administrative Code Section 76.23 explicitly states a passing grade of 70% .
7. While calculating annular volume for grouting, a driller miscalculates the borehole diameter. What is
the likely consequence?
A) Overuse or underuse of sealing materials, compromising the seal
B) Faster drilling progress
C) Reduced labor cost
D) Increased pump efficiency
Answer: A
Incorrect volume leads to improper sealing with voids or insufficient grout, risking contamination
pathways .
8. Which license class authorizes drilling of water wells, monitoring wells, and performing well repairs in
Texas?
A) Water Well Driller
