Florida (FL) Septic Tank Contractor Practice Exam 2026 –
200 Questions with Answers & Explanations for
Certification Prep| INSTANT PDF DOWNLAD
Q1. What is the primary purpose of a septic tank?
A. Filter drinking water
B. Store stormwater
C. Separate solids from wastewater
D. Disinfect wastewater
Answer: C
Explanation: Septic tanks allow solids to settle and scum to float so clarified
effluent can exit to the drainfield.
Q2. Which component receives effluent after it leaves the septic tank?
A. Grease trap
B. Lift station
C. Drainfield (soil absorption system)
D. Cleanout
Answer: C
Explanation: The drainfield disperses treated effluent into the soil for final
treatment.
Q3. In Florida, who regulates onsite sewage treatment and disposal systems
(OSTDS)?
A. EPA
B. County tax office
C. Florida Department of Health (DOH)
D. Department of Transportation
,Answer: C
Explanation: The Florida Department of Health oversees septic system
permitting, inspection, and regulation.
Q4. What is the minimum distance a septic tank must be from a private potable
well in Florida (standard conditions)?
A. 25 feet
B. 50 feet
C. 75 feet
D. 100 feet
Answer: C
Explanation: Florida code requires a minimum 75-foot setback from private
potable water wells.
Q5. What material is commonly approved for septic tank construction?
A. Wood
B. Aluminum
C. Concrete
D. Fiberglass only
Answer: C
Explanation: Concrete tanks are durable, watertight, and commonly approved;
fiberglass may also be allowed if approved.
Q6. What happens if sludge accumulates too high in a septic tank?
A. Improves treatment
B. Increases flow
C. Allows solids to enter the drainfield
D. Disinfects wastewater
,Answer: C
Explanation: Excess sludge can clog the drainfield, leading to system failure.
Q7. Which factor MOST affects drainfield size?
A. Tank color
B. Pipe material
C. Soil permeability
D. House age
Answer: C
Explanation: Soil type determines how quickly effluent can be absorbed and
treated.
Q8. What soil condition is generally unsuitable for conventional drainfields?
A. Sandy soil
B. Loamy soil
C. High groundwater table
D. Well-drained soil
Answer: C
Explanation: High groundwater can contaminate water sources and prevent
proper treatment.
Q9. What is the function of a baffle in a septic tank?
A. Increase pressure
B. Pump effluent
C. Prevent solids from exiting the tank
D. Add chemicals
Answer: C
Explanation: Baffles control flow and keep scum and sludge inside the tank.
, Q10. Before installing a septic system, what is required?
A. Verbal approval
B. Property deed
C. Site evaluation and permit
D. HOA approval
Answer: C
Explanation: Florida law requires permitting and site evaluation prior to
installation.
Q11. What type of system is commonly used where soil conditions are poor?
A. Gravity system
B. Mound or performance-based system
C. Holding tank
D. Storm drain
Answer: B
Explanation: Alternative systems are designed for challenging site conditions.
Q12. What is effluent?
A. Untreated sewage
B. Sludge
C. Liquid wastewater leaving the septic tank
D. Drinking water
Answer: C
Explanation: Effluent is partially treated liquid discharged to the drainfield.
Q13. Which pipe carries wastewater from the house to the septic tank?
200 Questions with Answers & Explanations for
Certification Prep| INSTANT PDF DOWNLAD
Q1. What is the primary purpose of a septic tank?
A. Filter drinking water
B. Store stormwater
C. Separate solids from wastewater
D. Disinfect wastewater
Answer: C
Explanation: Septic tanks allow solids to settle and scum to float so clarified
effluent can exit to the drainfield.
Q2. Which component receives effluent after it leaves the septic tank?
A. Grease trap
B. Lift station
C. Drainfield (soil absorption system)
D. Cleanout
Answer: C
Explanation: The drainfield disperses treated effluent into the soil for final
treatment.
Q3. In Florida, who regulates onsite sewage treatment and disposal systems
(OSTDS)?
A. EPA
B. County tax office
C. Florida Department of Health (DOH)
D. Department of Transportation
,Answer: C
Explanation: The Florida Department of Health oversees septic system
permitting, inspection, and regulation.
Q4. What is the minimum distance a septic tank must be from a private potable
well in Florida (standard conditions)?
A. 25 feet
B. 50 feet
C. 75 feet
D. 100 feet
Answer: C
Explanation: Florida code requires a minimum 75-foot setback from private
potable water wells.
Q5. What material is commonly approved for septic tank construction?
A. Wood
B. Aluminum
C. Concrete
D. Fiberglass only
Answer: C
Explanation: Concrete tanks are durable, watertight, and commonly approved;
fiberglass may also be allowed if approved.
Q6. What happens if sludge accumulates too high in a septic tank?
A. Improves treatment
B. Increases flow
C. Allows solids to enter the drainfield
D. Disinfects wastewater
,Answer: C
Explanation: Excess sludge can clog the drainfield, leading to system failure.
Q7. Which factor MOST affects drainfield size?
A. Tank color
B. Pipe material
C. Soil permeability
D. House age
Answer: C
Explanation: Soil type determines how quickly effluent can be absorbed and
treated.
Q8. What soil condition is generally unsuitable for conventional drainfields?
A. Sandy soil
B. Loamy soil
C. High groundwater table
D. Well-drained soil
Answer: C
Explanation: High groundwater can contaminate water sources and prevent
proper treatment.
Q9. What is the function of a baffle in a septic tank?
A. Increase pressure
B. Pump effluent
C. Prevent solids from exiting the tank
D. Add chemicals
Answer: C
Explanation: Baffles control flow and keep scum and sludge inside the tank.
, Q10. Before installing a septic system, what is required?
A. Verbal approval
B. Property deed
C. Site evaluation and permit
D. HOA approval
Answer: C
Explanation: Florida law requires permitting and site evaluation prior to
installation.
Q11. What type of system is commonly used where soil conditions are poor?
A. Gravity system
B. Mound or performance-based system
C. Holding tank
D. Storm drain
Answer: B
Explanation: Alternative systems are designed for challenging site conditions.
Q12. What is effluent?
A. Untreated sewage
B. Sludge
C. Liquid wastewater leaving the septic tank
D. Drinking water
Answer: C
Explanation: Effluent is partially treated liquid discharged to the drainfield.
Q13. Which pipe carries wastewater from the house to the septic tank?
