New Jersey Licensed Septic System Installer
Exam Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. Which of the following is the primary function of a septic system?
A. To provide drinking water
B. To treat and dispose of wastewater **
C. To pump groundwater
D. To store stormwater
The septic system is designed to treat and safely dispose of wastewater
from a building.
2. What is the minimum distance a septic system must be from a
drinking water well in New Jersey?
A. 25 feet
B. 50 feet
C. 100 feet **
D. 200 feet
State regulations require at least 100 feet separation to prevent
contamination of drinking water sources.
3. What is the primary component of a conventional septic system?
A. Drainfield
B. Septic tank **
, C. Sand filter
D. UV disinfection unit
The septic tank collects solids and allows anaerobic digestion, which is
central to conventional systems.
4. How often should a septic tank be inspected and pumped under
normal conditions?
A. Every 1 year
B. Every 2–3 years **
C. Every 5–7 years
D. Every 10 years
Pumping every 2–3 years prevents solids from overflowing into the
drainfield and causing failure.
5. What type of soil is most suitable for a septic drainfield?
A. Clay
B. Sandy loam **
C. Rock
D. Pure sand
Sandy loam provides good percolation while retaining some moisture
for microbial activity.
6. Which of the following indicates a failing septic system?
A. Slow draining sinks
B. Sewage surfacing in the yard **
C. Presence of algae in a nearby pond
D. Clean effluent
Sewage surfacing is a clear sign of system failure and requires
immediate attention.
, 7. What is the purpose of a distribution box in a septic system?
A. Filter wastewater
B. Distribute effluent evenly to the drainfield **
C. Pump solids
D. Measure water flow
The distribution box ensures effluent flows evenly to all trenches in the
drainfield.
8. When installing a septic system, which factor is most critical to
prevent system failure?
A. Type of household fixtures
B. Soil percolation rate **
C. Color of septic tank
D. Shape of the property
Soil percolation rate determines how quickly effluent can be absorbed,
which is essential for proper system function.
9. What is the typical capacity range for a single-family home septic
tank?
A. 250–500 gallons
B. 750–1,250 gallons **
C. 2,000–3,000 gallons
D. 5,000–6,000 gallons
A typical septic tank for a single-family home is sized between 750–
1,250 gallons to accommodate normal wastewater flow.
10. Which of the following chemicals should be avoided in a
septic system?
A. Household bleach
Exam Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following is the primary function of a septic system?
A. To provide drinking water
B. To treat and dispose of wastewater **
C. To pump groundwater
D. To store stormwater
The septic system is designed to treat and safely dispose of wastewater
from a building.
2. What is the minimum distance a septic system must be from a
drinking water well in New Jersey?
A. 25 feet
B. 50 feet
C. 100 feet **
D. 200 feet
State regulations require at least 100 feet separation to prevent
contamination of drinking water sources.
3. What is the primary component of a conventional septic system?
A. Drainfield
B. Septic tank **
, C. Sand filter
D. UV disinfection unit
The septic tank collects solids and allows anaerobic digestion, which is
central to conventional systems.
4. How often should a septic tank be inspected and pumped under
normal conditions?
A. Every 1 year
B. Every 2–3 years **
C. Every 5–7 years
D. Every 10 years
Pumping every 2–3 years prevents solids from overflowing into the
drainfield and causing failure.
5. What type of soil is most suitable for a septic drainfield?
A. Clay
B. Sandy loam **
C. Rock
D. Pure sand
Sandy loam provides good percolation while retaining some moisture
for microbial activity.
6. Which of the following indicates a failing septic system?
A. Slow draining sinks
B. Sewage surfacing in the yard **
C. Presence of algae in a nearby pond
D. Clean effluent
Sewage surfacing is a clear sign of system failure and requires
immediate attention.
, 7. What is the purpose of a distribution box in a septic system?
A. Filter wastewater
B. Distribute effluent evenly to the drainfield **
C. Pump solids
D. Measure water flow
The distribution box ensures effluent flows evenly to all trenches in the
drainfield.
8. When installing a septic system, which factor is most critical to
prevent system failure?
A. Type of household fixtures
B. Soil percolation rate **
C. Color of septic tank
D. Shape of the property
Soil percolation rate determines how quickly effluent can be absorbed,
which is essential for proper system function.
9. What is the typical capacity range for a single-family home septic
tank?
A. 250–500 gallons
B. 750–1,250 gallons **
C. 2,000–3,000 gallons
D. 5,000–6,000 gallons
A typical septic tank for a single-family home is sized between 750–
1,250 gallons to accommodate normal wastewater flow.
10. Which of the following chemicals should be avoided in a
septic system?
A. Household bleach
