New Jersey Licensed Septic System Installer
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the minimum depth of cover required over a standard
septic tank in New Jersey?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
The minimum cover is required to prevent freezing and protect the
tank from damage.
2. Which soil type is most suitable for a conventional septic system?
A. Clay
B. Sandy loam
C. Silt
D. Heavy clay
Sandy loam provides good percolation while retaining some
moisture for treatment.
3. What is the minimum distance a septic tank must be from a water
supply well in New Jersey?
A. 25 feet
B. 50 feet
, C. 75 feet
D. 100 feet
State regulations require at least 100 feet to prevent
contamination of potable water.
4. When installing a septic system, what is the maximum slope
allowed for the drain field trenches?
A. 1%
B. 2%
C. 5%
D. 10%
Excessive slope can cause uneven distribution of effluent and
potential system failure.
5. What is the primary purpose of a distribution box?
A. To aerate effluent
B. To evenly distribute effluent to the drain field
C. To filter solids
D. To prevent root intrusion
The distribution box ensures effluent is evenly sent to all trenches.
6. Which of the following is required for effluent to leave a septic
tank properly?
A. Pump
B. Baffle
C. Aerator
D. Filter
Baffles direct effluent from the tank outlet and prevent solids from
leaving.
, 7. How often should a standard septic tank be pumped in New
Jersey?
A. Every 1 year
B. Every 3 years
C. Every 3–5 years
D. Every 10 years
Regular pumping prevents solids from entering the drain field and
causing failure.
8. What is the minimum length of a conventional septic tank in New
Jersey?
A. 4 feet
B. 8 feet
C. 10 feet
D. 12 feet
This length ensures proper settling and treatment of solids.
9. Which factor is most important when determining the size of a
septic tank?
A. Depth of water table
B. Number of bedrooms in the house
C. Type of soil
D. Distance to well
Tank size is based on expected daily flow, which correlates to the
number of bedrooms.
10. How far must a septic system be from property lines?
A. 5 feet
B. 10 feet
C. 15 feet
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the minimum depth of cover required over a standard
septic tank in New Jersey?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
The minimum cover is required to prevent freezing and protect the
tank from damage.
2. Which soil type is most suitable for a conventional septic system?
A. Clay
B. Sandy loam
C. Silt
D. Heavy clay
Sandy loam provides good percolation while retaining some
moisture for treatment.
3. What is the minimum distance a septic tank must be from a water
supply well in New Jersey?
A. 25 feet
B. 50 feet
, C. 75 feet
D. 100 feet
State regulations require at least 100 feet to prevent
contamination of potable water.
4. When installing a septic system, what is the maximum slope
allowed for the drain field trenches?
A. 1%
B. 2%
C. 5%
D. 10%
Excessive slope can cause uneven distribution of effluent and
potential system failure.
5. What is the primary purpose of a distribution box?
A. To aerate effluent
B. To evenly distribute effluent to the drain field
C. To filter solids
D. To prevent root intrusion
The distribution box ensures effluent is evenly sent to all trenches.
6. Which of the following is required for effluent to leave a septic
tank properly?
A. Pump
B. Baffle
C. Aerator
D. Filter
Baffles direct effluent from the tank outlet and prevent solids from
leaving.
, 7. How often should a standard septic tank be pumped in New
Jersey?
A. Every 1 year
B. Every 3 years
C. Every 3–5 years
D. Every 10 years
Regular pumping prevents solids from entering the drain field and
causing failure.
8. What is the minimum length of a conventional septic tank in New
Jersey?
A. 4 feet
B. 8 feet
C. 10 feet
D. 12 feet
This length ensures proper settling and treatment of solids.
9. Which factor is most important when determining the size of a
septic tank?
A. Depth of water table
B. Number of bedrooms in the house
C. Type of soil
D. Distance to well
Tank size is based on expected daily flow, which correlates to the
number of bedrooms.
10. How far must a septic system be from property lines?
A. 5 feet
B. 10 feet
C. 15 feet
