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Free Water Well Contractor Test Practice Questions

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Sample Practice Questions

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

  1. 1After final grading, how high must the top of a water-well casing extend above the finished ground surface?

    1. A. 6 inches
    2. B. 12 inches
    3. C. 18 inches
    4. D. 24 inches

    Answer: B

    Explanation: The rule says the casing "shall extend a minimum of twelve inches (12") above ground" surface. Thus B is the required height.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.010(1)(A)

  2. 2For steel casing governed by the standard table, what minimum wall thickness is specified?

    1. A. 0.125 inch
    2. B. 0.154 inch
    3. C. 0.188 inch
    4. D. 0.250 inch

    Answer: C

    Explanation: The official "Minimum standards for steel casing" table lists 0.188 inch for the covered sizes. Thus C is correct.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.030(1)(A)1, Table 3.2 Wall Thickness

  3. 3How must a new well awaiting pump installation be protected at the top?

    1. A. With only a downward screened vent
    2. B. With a watertight cap that prevents surface contamination
    3. C. With a loose temporary cover below grade
    4. D. With an unsealed hubcap-type cover

    Answer: B

    Explanation: For a new well awaiting a pump, "the wellhead shall be fitted with a cap that is" watertight and protective. Thus B is correct.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.050(1)(C)

  4. 4Who must determine the applicable Missouri drilling area before choosing an area's construction standard?

    1. A. The well owner
    2. B. The well installation contractor
    3. C. The pump installation contractor
    4. D. The department laboratory

    Answer: B

    Explanation: It is the "well installation contractor to determine in which drilling area a" proposed well lies. Therefore B is correct.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.030

  5. 5Who is ordinarily responsible for having an abandoned water well plugged?

    1. A. The well installation contractor in every case
    2. B. The well owner, subject to the improper-construction exception
    3. C. The pump installation contractor in every case
    4. D. The department in every case

    Answer: B

    Explanation: The rule says, "The well owner shall be responsible for plugging" abandoned wells, while retaining the stated improper-construction exception. Thus B is correct.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.110(1)(C)

  6. 6What drainage condition is required around a completed water well?

    1. A. A gravel basin must hold runoff within 10 feet
    2. B. The casing must be below grade
    3. C. Water must drain away with no ponding within 10 feet
    4. D. A ditch must circle the casing at 5 feet

    Answer: C

    Explanation: The site must "prevent the accumulation or ponding of surface water within" ten feet of the well. Therefore C is correct.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.010(1)(A)

  7. 7How must adjoining sections of steel water-well casing be connected?

    1. A. By the solvent-weld method used for plastic joints
    2. B. By the mechanical-joint method permitted for plastic casing
    3. C. By fitting a drive shoe at the lower casing end
    4. D. By watertight welded or threaded joints

    Answer: D

    Explanation: For steel casing, "Joints shall be welded or threaded and be" watertight. The other choices are real plastic-joint or drive-shoe practices, not steel-section joining rules.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.030(1)(A)1.A

  8. 8Which piping and electrical connection treatment is required at a standard aboveground wellhead completion?

    1. A. A watertight well seal between casing and a surface-pump suction pipe
    2. B. A pitless adapter or unit used for a belowground connection
    3. C. Watertight mechanical or welded and sealed connections
    4. D. A one-half-inch screened vent pointed downward

    Answer: C

    Explanation: Aboveground connections must "Have watertight piping and electrical connections that" are mechanical or welded and sealed. The other choices are real requirements for different wellhead components or completion types.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.050(6)(A)2

  9. 9A contractor locates a standard bedrock well in Drilling Area 1. Which casing pair meets the area minimums?

    1. A. 20 feet total with 5 feet into bedrock
    2. B. 40 feet total with 15 feet into bedrock
    3. C. 60 feet total with 20 feet into bedrock
    4. D. 80 feet total with 30 feet into solid bedrock

    Answer: D

    Explanation: Area 1 requires "a minimum of eighty feet (80') of casing" extending at least 30 feet into solid bedrock. Option D meets both minimums.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.030

  10. 10Within what period must a dry hole be plugged?

    1. A. 10 days
    2. B. 20 days
    3. C. 30 days
    4. D. 60 days

    Answer: C

    Explanation: The rule states, "A dry hole shall be plugged within thirty (30) days" and requires a plugging record. Thus C is correct.

    Reference: Missouri Secretary of State: Code of State Regulations — 10 CSR 23-3.110(1)(C)2

Topics in this practice bank

These topics describe the available practice for Water Well Contractor Test. Review the examination outline and its sources for scope and allocation details.

  • Well Siting and Groundwater Protection
    • Location, drainage, casing height, and contamination setbacks
    • Groundwater safeguards during construction and repair
  • Water Well Construction
    • Casing materials, joints, installation, and boreholes
    • Grout materials, cure times, and placement methods
    • Multifamily, high-yield, public, and oil-or-gas-zone wells
  • Wellhead Completion, Disinfection, and Liners
    • Wellhead protection and disinfection
    • Liner materials, placement, packers, and seals
  • Missouri Drilling Areas
    • Construction and contamination controls in Drilling Areas 1 through 13
  • Water Well Plugging
    • Responsibility, preparation, materials, and plugging methods

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These are independent study questions, not actual examination items. For examination requirements and official information, view Water Well Contractor Test details.