Florida Water Well Drilling
Contractor Exam Questions And
Correct Answers (Verified Answers)
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1. What is the minimum distance a potable water well must be from a
septic tank in Florida?
A. 10 feet
B. 50 feet
C. 100 feet
D. 200 feet
B. 50 feet
Rationale: Florida regulations require that potable water wells be at
least 50 feet from septic tanks to prevent contamination.
2. Which casing material is most commonly used for potable water wells?
A. PVC
B. Steel
C. Copper
D. Concrete
A. PVC
Rationale: PVC is widely used because it is corrosion-resistant,
durable, and cost-effective.
3. What is the purpose of a well screen?
A. To prevent pump damage
B. To filter out sediment and allow water entry
C. To seal the well from surface contamination
D. To maintain water pressure
B. To filter out sediment and allow water entry
, Rationale: Well screens allow water to enter the well while preventing
sand and sediment from entering the pump.
4. What is the typical diameter range for residential water wells?
A. 1–2 inches
B. 4–6 inches
C. 10–12 inches
D. 15–20 inches
B. 4–6 inches
Rationale: Residential wells usually have diameters of 4 to 6 inches to
balance water yield and cost.
5. Which drilling method is generally used for unconsolidated sand and
gravel formations?
A. Cable tool drilling
B. Rotary drilling with mud
C. Air rotary drilling
D. Percussion drilling
C. Air rotary drilling
Rationale: Air rotary drilling is effective in unconsolidated
formations, as it uses compressed air to remove cuttings and maintain
the borehole.
6. Which Florida agency issues water well construction permits?
A. EPA
B. Florida Department of Environmental Protection (FDEP)
C. Florida Department of Health (DOH)
D. Florida Water Management District
B. Florida Department of Environmental Protection (FDEP)
Rationale: The FDEP oversees water well construction permitting
and compliance in Florida.
7. What is the maximum allowable drawdown for a private well during
pumping tests?
A. 5 feet
B. 10 feet
C. 25 feet
D. 50 feet
B. 10 feet
Rationale: Drawdown limits are set to prevent excessive aquifer
depletion and well damage.
, 8. What type of pump is typically installed in deep wells exceeding 100
feet?
A. Centrifugal jet pump
B. Submersible pump
C. Hand pump
D. Windmill pump
B. Submersible pump
Rationale: Submersible pumps are designed for deep wells because
they can operate underwater and lift water efficiently.
9. What is the main purpose of grouting a water well?
A. Improve water flow
B. Stabilize the casing and prevent contamination
C. Increase pumping capacity
D. Reduce drilling costs
B. Stabilize the casing and prevent contamination
Rationale: Grouting seals the annular space between the casing and
borehole, preventing surface water contamination.
10. What is a common method to disinfect a new well before use?
A. Boiling water
B. Chlorination
C. Filtration
D. Ultraviolet light
B. Chlorination
Rationale: Chlorination with bleach or other chlorine compounds is
standard for disinfecting wells before use.
11. What is the recommended slope away from a well for surface
drainage?
A. 1 inch per foot
B. 6 inches per 10 feet
C. 2 inches per foot
D. 12 inches per 20 feet
B. 6 inches per 10 feet
Rationale: Proper surface drainage prevents contamination of the
well by diverting runoff.
12. Which type of aquifer is typically more susceptible to
contamination?
A. Confined aquifer
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. What is the minimum distance a potable water well must be from a
septic tank in Florida?
A. 10 feet
B. 50 feet
C. 100 feet
D. 200 feet
B. 50 feet
Rationale: Florida regulations require that potable water wells be at
least 50 feet from septic tanks to prevent contamination.
2. Which casing material is most commonly used for potable water wells?
A. PVC
B. Steel
C. Copper
D. Concrete
A. PVC
Rationale: PVC is widely used because it is corrosion-resistant,
durable, and cost-effective.
3. What is the purpose of a well screen?
A. To prevent pump damage
B. To filter out sediment and allow water entry
C. To seal the well from surface contamination
D. To maintain water pressure
B. To filter out sediment and allow water entry
, Rationale: Well screens allow water to enter the well while preventing
sand and sediment from entering the pump.
4. What is the typical diameter range for residential water wells?
A. 1–2 inches
B. 4–6 inches
C. 10–12 inches
D. 15–20 inches
B. 4–6 inches
Rationale: Residential wells usually have diameters of 4 to 6 inches to
balance water yield and cost.
5. Which drilling method is generally used for unconsolidated sand and
gravel formations?
A. Cable tool drilling
B. Rotary drilling with mud
C. Air rotary drilling
D. Percussion drilling
C. Air rotary drilling
Rationale: Air rotary drilling is effective in unconsolidated
formations, as it uses compressed air to remove cuttings and maintain
the borehole.
6. Which Florida agency issues water well construction permits?
A. EPA
B. Florida Department of Environmental Protection (FDEP)
C. Florida Department of Health (DOH)
D. Florida Water Management District
B. Florida Department of Environmental Protection (FDEP)
Rationale: The FDEP oversees water well construction permitting
and compliance in Florida.
7. What is the maximum allowable drawdown for a private well during
pumping tests?
A. 5 feet
B. 10 feet
C. 25 feet
D. 50 feet
B. 10 feet
Rationale: Drawdown limits are set to prevent excessive aquifer
depletion and well damage.
, 8. What type of pump is typically installed in deep wells exceeding 100
feet?
A. Centrifugal jet pump
B. Submersible pump
C. Hand pump
D. Windmill pump
B. Submersible pump
Rationale: Submersible pumps are designed for deep wells because
they can operate underwater and lift water efficiently.
9. What is the main purpose of grouting a water well?
A. Improve water flow
B. Stabilize the casing and prevent contamination
C. Increase pumping capacity
D. Reduce drilling costs
B. Stabilize the casing and prevent contamination
Rationale: Grouting seals the annular space between the casing and
borehole, preventing surface water contamination.
10. What is a common method to disinfect a new well before use?
A. Boiling water
B. Chlorination
C. Filtration
D. Ultraviolet light
B. Chlorination
Rationale: Chlorination with bleach or other chlorine compounds is
standard for disinfecting wells before use.
11. What is the recommended slope away from a well for surface
drainage?
A. 1 inch per foot
B. 6 inches per 10 feet
C. 2 inches per foot
D. 12 inches per 20 feet
B. 6 inches per 10 feet
Rationale: Proper surface drainage prevents contamination of the
well by diverting runoff.
12. Which type of aquifer is typically more susceptible to
contamination?
A. Confined aquifer
