Free Water Well Driller Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Water Well Driller Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1For a Texas domestic water well, what screen is required unless the landowner waives it?

   1. A. A manufacturer's well screen
   2. B. Any hand-cut pipe selected by the crew
   3. C. An open hole with no screen
   4. D. A used oil-field screen

   Answer: A

   Explanation: The TDLR waiver quotes 16 TAC §76.78(a): “Unless waived by the landowner, a licensee shall use a manufacturer’s well screen.”

   Reference: Manufactured Screen Waiver (English version) — 16 TAC §76.78(a); Item 4, first acknowledgment

2. 2When screening potential Texas well sites, which part of an aquifer corresponds to its principal recharge zone?

   1. A. The outcrop where the host formation is exposed at land surface
   2. B. The confined downdip area beneath low-permeability beds
   3. C. The deepest portion beyond the aquifer's saline boundary
   4. D. The pumping cone surrounding an individual production well

   Answer: A

   Explanation: TWDB explains that the aquifer's surface extent, or outcrop, is where the host formation is exposed at land surface and: “This area corresponds to the principal recharge zone for the aquifers.”

   Reference: Texas Aquifers | Texas Water Development Board — Texas Aquifers, introductory aquifer-characteristics discussion

3. 3What role can sulfate-reducing bacteria play in a well?

   1. A. They catalyze corrosion
   2. B. They promote mineral encrustation without metal loss
   3. C. They passivate the anodic screen slots against attack
   4. D. They sterilize the screen and surrounding filter pack

   Answer: A

   Explanation: The USGS summary states: “Some wells contain sulfate-reducing bacteria, which catalyze corrosion.”

   Reference: Evaluation and control of corrosion and encrustation in tube wells of the Indus Plains, West Pakistan | U.S. Geological Survey — Abstract

4. 4Which coordinate pair identifies a well location on the Texas Well Report?

   1. A. Northing and elevation only
   2. B. Township and range only
   3. C. Latitude and longitude
   4. D. Street number and ZIP code only

   Answer: C

   Explanation: TDLR Form 001WWD places “Lat.” and “Long.” in the well-location data.

   Reference: Twdb Aquifer Properties — 16 TAC §76.700; Items 2-3, Well Location

5. 5What kind of helmet is required near exposed electrical conductors that could contact the head?

   1. A. A helmet designed to reduce electrical-shock hazard
   2. B. A soft cap with no rating
   3. C. A face shield alone
   4. D. Hearing protection only

   Answer: A

   Explanation: OSHA 1910.135(a)(2) requires “a protective helmet designed to reduce electrical shock hazard” near such conductors.

   Reference: 1910.135 - Head protection. | Occupational Safety and Health Administration — §1910.135(a)(2)

6. 6Which parties must sign Texas's manufactured-screen waiver before it is effective?

   1. A. The driller and the pump installer
   2. B. The driller and the owner or authorized person having the well drilled
   3. C. The owner and a county official
   4. D. The screen manufacturer and the owner

   Answer: B

   Explanation: TDLR Form WWD005N provides signature lines for “Signature of Driller” and “Signature of Owner, (or person having well drilled, if authorized by Owner).”

   Reference: Manufactured Screen Waiver (English version) — 16 TAC §76.78(b); Signature section

7. 7Under the classification in Texas Report 89-01, which TDS concentration is fresh water?

   1. A. Less than 1,000 ppm
   2. B. 1,000 to 3,000 ppm
   3. C. 10,000 to 35,000 ppm
   4. D. Greater than 35,000 ppm

   Answer: A

   Explanation: The USGS glossary defines fresh water as “water that contains less than 1,000 milligrams per liter (mg/L) of dissolved solids.”

   Reference: Water Science Glossary | U.S. Geological Survey — F — freshwater

8. 8Where did USGS observe corrosion concentrated in the studied well screens?

   1. A. On concrete slabs
   2. B. In the active saw slots
   3. C. Only on pump wiring
   4. D. Only above land surface

   Answer: B

   Explanation: USGS reports: “Corrosion is concentrated in the relatively active (anodic) saw slots of water-well filter pipes (screens).”

   Reference: Evaluation and control of corrosion and encrustation in tube wells of the Indus Plains, West Pakistan | U.S. Geological Survey — Abstract

9. 9Coordinates are needed for a Texas Plugging Report. Which location method does the form prescribe?

   1. A. Estimate from memory
   2. B. Use only the owner's mailing address
   3. C. Copy an unrelated well's coordinates
   4. D. Use GPS or an Internet mapping website

   Answer: D

   Explanation: TDLR Form WWD004N says the person “must locate and identify the location of the well using a Global Positioning System (GPS) or Internet Mapping Website.”

   Reference: Wwd Plugging Report — 16 TAC §76.700; Items 3-6, location instruction

10. 10What is OSHA's default rule for exposed live electrical parts before an employee works on or near them?

    1. A. Install an insulating barrier and treat that as authorization for energized work
    2. B. Deenergize them, unless doing so creates added hazards or is infeasible
    3. C. Maintain overhead-line clearance and leave the exposed parts energized
    4. D. Assign an observer and leave the exposed parts energized

    Answer: B

    Explanation: OSHA 1910.333(a)(1) says exposed live parts “shall be deenergized before the employee works on or near them” subject to the stated hazard and infeasibility exceptions.

    Reference: 1910.333 - Selection and use of work practices. | Occupational Safety and Health Administration — §1910.333(a)(1)