FLORIDA (FL) SEPTIC TANK CONTRACTOR PRACTICE EXAM | LATEST VERIFIED QUESTIONS AND
CORRECT ANSWERS – QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS
| PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
CORE DOMAINS
1. Florida Onsite Sewage Treatment and Disposal Systems (OSTDS) Rules and Statutes
2. System Design, Sizing, and Site Evaluation
3. Soil Science, Percolation, and Water Table Determination
4. Installation, Construction, and Materials
5. Inspection, Testing, and Troubleshooting
6. Maintenance, Operation, and Repair
7. Safety, Occupational Hazards, and Professional Responsibility
8. Ethics, Business Practices, and Regulatory Compliance
9. Wastewater Characteristics, Treatment, and Dispersal
10. Permit Application, Records, and Legal Documentation
INTRODUCTION
This examination assesses the knowledge, skills, and professional judgment required of Florida
septic tank contractors. It covers foundational theory, applied technical concepts, regulatory
compliance, safety, and ethical standards. Questions include direct knowledge and scenario-
based problem-solving items that reflect real-world workplace decisions. Candidates must
demonstrate understanding of Florida OSTDS rules, site evaluation, system design, installation,
inspection, maintenance, and repair. The exam emphasizes critical thinking, interpretation, and
professional responsibility. A passing score requires competency across all core domains. This
document contains 200 multiple-choice questions with verified correct answers and detailed
rationales. Use it to prepare thoroughly for the Florida Septic Tank Contractor Practice Exam.
SECTION ONE – QUESTIONS 1–100
1. Which Florida agency primarily regulates onsite sewage treatment and disposal systems?
A. Department of Environmental Protection
B. Department of Health
C. Department of Agriculture
, D. Department of Transportation
🟢 Correct answer: B
🔴 Explanation: The Florida Department of Health (DOH) is the primary regulatory agency
for onsite sewage treatment and disposal systems under Chapter 64E-6, Florida
Administrative Code.
2. What is the minimum setback distance from a septic tank to a private water supply well in
Florida?
A. 25 feet
B. 50 feet
C. 75 feet
D. 100 feet
🟢 Correct answer: C
🔴 Explanation: Florida rules require a minimum 75-foot setback between a septic tank and
a private potable water well to reduce contamination risk.
3. A septic tank is designed primarily to:
A. Treat all pathogens
B. Separate solids and provide partial digestion
C. Disinfect effluent
D. Remove all nitrogen
🟢 Correct answer: B
🔴 Explanation: Septic tanks separate floatable and settleable solids and provide anaerobic
digestion, but they do not fully treat or disinfect wastewater.
4. What is the typical minimum liquid capacity for a residential septic tank in Florida?
A. 500 gallons
B. 750 gallons
C. 1,000 gallons
D. 1,500 gallons
🟢 Correct answer: C
🔴 Explanation: Florida requires a minimum 1,000-gallon liquid capacity for most new
residential septic tanks serving a single dwelling.
5. The percolation test is used to determine:
A. Groundwater elevation
B. Soil permeability for drainfield sizing
C. Tank volume
, D. Pipe slope
🟢 Correct answer: B
🔴 Explanation: Percolation testing measures the rate at which water drains through soil,
which is used to size the drainfield absorption area.
6. Which soil texture generally has the fastest percolation rate?
A. Clay
B. Silt
C. Sand
D. Loam
🟢 Correct answer: C
🔴 Explanation: Sandy soils have larger pore spaces and therefore generally drain faster
than clay, silt, or loam.
7. A high seasonal water table is most likely to require:
A. A smaller drainfield
B. A mounded or elevated drainfield
C. No permit
D. A grease trap
🟢 Correct answer: B
🔴 Explanation: When the seasonal water table is close to the surface, an elevated or
mounded drainfield may be required to maintain separation.
8. What is the minimum required separation between the bottom of a drainfield trench and the
seasonal high water table in Florida?
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
🟢 Correct answer: C
🔴 Explanation: Florida rules generally require at least 24 inches of separation between the
drainfield bottom and the seasonal high water table.
9. Which component prevents backflow of sewage into the building?
A. Baffle
B. Backwater valve
C. Distribution box
D. Pump chamber
, 🟢 Correct answer: B
🔴 Explanation: A backwater valve (backflow preventer) prevents sewage from reversing into
the building during surcharge conditions.
10. A distribution box (D-box) is used to:
A. Pump effluent
B. Equalize flow to drainfield laterals
C. Grind solids
D. Store sludge
🟢 Correct answer: B
🔴 Explanation: The D-box divides and distributes effluent evenly among drainfield laterals.
11. Which of the following is a sign of a failing septic system?
A. Slow drains and sewage odors
B. Clear effluent in the yard
C. Low water bill
D. New grass growth over the drainfield
🟢 Correct answer: A
🔴 Explanation: Slow drains, odors, and surfacing sewage are common indicators of septic
system failure.
12. How often should a typical residential septic tank be inspected?
A. Every month
B. Every year
C. Every 3 to 5 years
D. Every 10 years
🟢 Correct answer: C
🔴 Explanation: Florida recommends inspection every 3 to 5 years for conventional systems,
with more frequent pumping as needed.
13. What is the primary purpose of a grease trap?
A. Remove pathogens
B. Capture fats, oils, and grease
C. Add oxygen
D. Disinfect effluent
🟢 Correct answer: B
🔴 Explanation: Grease traps intercept fats, oils, and grease to prevent them from entering
and clogging the septic system.
CORRECT ANSWERS – QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS
| PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
CORE DOMAINS
1. Florida Onsite Sewage Treatment and Disposal Systems (OSTDS) Rules and Statutes
2. System Design, Sizing, and Site Evaluation
3. Soil Science, Percolation, and Water Table Determination
4. Installation, Construction, and Materials
5. Inspection, Testing, and Troubleshooting
6. Maintenance, Operation, and Repair
7. Safety, Occupational Hazards, and Professional Responsibility
8. Ethics, Business Practices, and Regulatory Compliance
9. Wastewater Characteristics, Treatment, and Dispersal
10. Permit Application, Records, and Legal Documentation
INTRODUCTION
This examination assesses the knowledge, skills, and professional judgment required of Florida
septic tank contractors. It covers foundational theory, applied technical concepts, regulatory
compliance, safety, and ethical standards. Questions include direct knowledge and scenario-
based problem-solving items that reflect real-world workplace decisions. Candidates must
demonstrate understanding of Florida OSTDS rules, site evaluation, system design, installation,
inspection, maintenance, and repair. The exam emphasizes critical thinking, interpretation, and
professional responsibility. A passing score requires competency across all core domains. This
document contains 200 multiple-choice questions with verified correct answers and detailed
rationales. Use it to prepare thoroughly for the Florida Septic Tank Contractor Practice Exam.
SECTION ONE – QUESTIONS 1–100
1. Which Florida agency primarily regulates onsite sewage treatment and disposal systems?
A. Department of Environmental Protection
B. Department of Health
C. Department of Agriculture
, D. Department of Transportation
🟢 Correct answer: B
🔴 Explanation: The Florida Department of Health (DOH) is the primary regulatory agency
for onsite sewage treatment and disposal systems under Chapter 64E-6, Florida
Administrative Code.
2. What is the minimum setback distance from a septic tank to a private water supply well in
Florida?
A. 25 feet
B. 50 feet
C. 75 feet
D. 100 feet
🟢 Correct answer: C
🔴 Explanation: Florida rules require a minimum 75-foot setback between a septic tank and
a private potable water well to reduce contamination risk.
3. A septic tank is designed primarily to:
A. Treat all pathogens
B. Separate solids and provide partial digestion
C. Disinfect effluent
D. Remove all nitrogen
🟢 Correct answer: B
🔴 Explanation: Septic tanks separate floatable and settleable solids and provide anaerobic
digestion, but they do not fully treat or disinfect wastewater.
4. What is the typical minimum liquid capacity for a residential septic tank in Florida?
A. 500 gallons
B. 750 gallons
C. 1,000 gallons
D. 1,500 gallons
🟢 Correct answer: C
🔴 Explanation: Florida requires a minimum 1,000-gallon liquid capacity for most new
residential septic tanks serving a single dwelling.
5. The percolation test is used to determine:
A. Groundwater elevation
B. Soil permeability for drainfield sizing
C. Tank volume
, D. Pipe slope
🟢 Correct answer: B
🔴 Explanation: Percolation testing measures the rate at which water drains through soil,
which is used to size the drainfield absorption area.
6. Which soil texture generally has the fastest percolation rate?
A. Clay
B. Silt
C. Sand
D. Loam
🟢 Correct answer: C
🔴 Explanation: Sandy soils have larger pore spaces and therefore generally drain faster
than clay, silt, or loam.
7. A high seasonal water table is most likely to require:
A. A smaller drainfield
B. A mounded or elevated drainfield
C. No permit
D. A grease trap
🟢 Correct answer: B
🔴 Explanation: When the seasonal water table is close to the surface, an elevated or
mounded drainfield may be required to maintain separation.
8. What is the minimum required separation between the bottom of a drainfield trench and the
seasonal high water table in Florida?
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
🟢 Correct answer: C
🔴 Explanation: Florida rules generally require at least 24 inches of separation between the
drainfield bottom and the seasonal high water table.
9. Which component prevents backflow of sewage into the building?
A. Baffle
B. Backwater valve
C. Distribution box
D. Pump chamber
, 🟢 Correct answer: B
🔴 Explanation: A backwater valve (backflow preventer) prevents sewage from reversing into
the building during surcharge conditions.
10. A distribution box (D-box) is used to:
A. Pump effluent
B. Equalize flow to drainfield laterals
C. Grind solids
D. Store sludge
🟢 Correct answer: B
🔴 Explanation: The D-box divides and distributes effluent evenly among drainfield laterals.
11. Which of the following is a sign of a failing septic system?
A. Slow drains and sewage odors
B. Clear effluent in the yard
C. Low water bill
D. New grass growth over the drainfield
🟢 Correct answer: A
🔴 Explanation: Slow drains, odors, and surfacing sewage are common indicators of septic
system failure.
12. How often should a typical residential septic tank be inspected?
A. Every month
B. Every year
C. Every 3 to 5 years
D. Every 10 years
🟢 Correct answer: C
🔴 Explanation: Florida recommends inspection every 3 to 5 years for conventional systems,
with more frequent pumping as needed.
13. What is the primary purpose of a grease trap?
A. Remove pathogens
B. Capture fats, oils, and grease
C. Add oxygen
D. Disinfect effluent
🟢 Correct answer: B
🔴 Explanation: Grease traps intercept fats, oils, and grease to prevent them from entering
and clogging the septic system.
