New Hampshire Septic Installer Exam 3 Study Guide | Site
Conditions, Setbacks, EDAs & Troubleshooting
This professional regulatory resource serves as a premier test bank explicitly
engineered for subsurface wastewater practitioners preparing for the New Hampshire
Department of Environmental Services (NHDES) Septic System Installer
Certification Examination. It features high-yield, scenario-based practice questions,
100% verified correct answers, and thorough legal and technical rationales
mapped directly to the New Hampshire Code of Administrative Rules Chapter Env-Wq
1000. Reviewing these premium testing parameters ensures absolute competence
across site condition evaluations, regulatory setback distances, Effluent Disposal Area
(EDA) design mechanics, and complex field troubleshooting protocols to guarantee
you clear your state licensing benchmark on the first attempt.
1. What is the primary function of a septic tank in a subsurface disposal system?
A. To aerate wastewater
B. To separate solids from wastewater
C. To chlorinate effluent
D. To reduce nitrates
Answer: B
Rationale: The septic tank functions as a conditioning device to provide primary treatment,
settling solids and allowing clarified effluent to exit to the leach field .
2. The minimum depth to the seasonal high-water table for a standard leach field
in New Hampshire is:
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
Answer: B
Rationale: NH rules require a minimum 12-inch vertical separation between the bed
bottom and the seasonal high-water table .
, 3. What is the most reliable indicator of the seasonal high-water table in a soil test
pit?
A. Leaf litter
B. Redoximorphic features
C. Soil pH
D. Texture alone
Answer: B
Rationale: Redox features indicate prolonged saturation and are required for proper site
evaluation .
4. The percolation test evaluates which soil property?
A. Soil color
B. Soil pH
C. Rate at which water moves through soil
D. Organic content
Answer: C
Rationale: A perc test measures the infiltration rate used for sizing absorption areas .
5. A distribution box must be installed:
A. On a slope greater than 25%
B. Level to ensure equal flow distribution
C. Below the water table
D. As close as possible to the tank
Answer: B
Rationale: Level placement ensures even loading across the field lines .
6. Pump chambers are used when:
A. The perc rate is too fast
B. Soil is too sandy
C. Elevation prevents gravity flow to the leach field
D. Tanks are oversized
Answer: C
Rationale: Pumps lift effluent when gravity flow is not possible .
7. The effluent filter is located:
A. In the distribution box
B. At the outlet of the septic tank
Conditions, Setbacks, EDAs & Troubleshooting
This professional regulatory resource serves as a premier test bank explicitly
engineered for subsurface wastewater practitioners preparing for the New Hampshire
Department of Environmental Services (NHDES) Septic System Installer
Certification Examination. It features high-yield, scenario-based practice questions,
100% verified correct answers, and thorough legal and technical rationales
mapped directly to the New Hampshire Code of Administrative Rules Chapter Env-Wq
1000. Reviewing these premium testing parameters ensures absolute competence
across site condition evaluations, regulatory setback distances, Effluent Disposal Area
(EDA) design mechanics, and complex field troubleshooting protocols to guarantee
you clear your state licensing benchmark on the first attempt.
1. What is the primary function of a septic tank in a subsurface disposal system?
A. To aerate wastewater
B. To separate solids from wastewater
C. To chlorinate effluent
D. To reduce nitrates
Answer: B
Rationale: The septic tank functions as a conditioning device to provide primary treatment,
settling solids and allowing clarified effluent to exit to the leach field .
2. The minimum depth to the seasonal high-water table for a standard leach field
in New Hampshire is:
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
Answer: B
Rationale: NH rules require a minimum 12-inch vertical separation between the bed
bottom and the seasonal high-water table .
, 3. What is the most reliable indicator of the seasonal high-water table in a soil test
pit?
A. Leaf litter
B. Redoximorphic features
C. Soil pH
D. Texture alone
Answer: B
Rationale: Redox features indicate prolonged saturation and are required for proper site
evaluation .
4. The percolation test evaluates which soil property?
A. Soil color
B. Soil pH
C. Rate at which water moves through soil
D. Organic content
Answer: C
Rationale: A perc test measures the infiltration rate used for sizing absorption areas .
5. A distribution box must be installed:
A. On a slope greater than 25%
B. Level to ensure equal flow distribution
C. Below the water table
D. As close as possible to the tank
Answer: B
Rationale: Level placement ensures even loading across the field lines .
6. Pump chambers are used when:
A. The perc rate is too fast
B. Soil is too sandy
C. Elevation prevents gravity flow to the leach field
D. Tanks are oversized
Answer: C
Rationale: Pumps lift effluent when gravity flow is not possible .
7. The effluent filter is located:
A. In the distribution box
B. At the outlet of the septic tank
