Alabama Onsite Wastewater Installer Exam|
ULTIMATE EXAM WITH CORRECT VERIFIED
ANSWERS
1. The primary function of an onsite wastewater system is
to:
A. Store sewage indefinitely
B. Treat and disperse effluent into soil
C. Evaporate all wastewater
D. Remove nutrients only
Correct Answer: B
Rationale: Onsite systems provide treatment and safe soil
absorption.
2. The most critical soil property affecting absorption field
performance is:
A. Color
B. Permeability
C. Temperature
D. Depth only
Correct Answer: B
,3. A percolation rate that is too fast indicates:
A. Poor drainage
B. Risk of groundwater contamination
C. Excess treatment
D. Low infiltration
Correct Answer: B
4. Minimum vertical separation between trench bottom and
groundwater protects:
A. Pipe integrity
B. Public health and treatment effectiveness
C. Pump operation
D. Tank strength
Correct Answer: B
5. Septic tank detention time is primarily determined by:
A. Soil type
,B. Tank volume and flow rate
C. Pipe material
D. Ground slope
Correct Answer: B
6. The scum layer in a septic tank consists mainly of:
A. Heavy solids
B. Floating fats, oils, and grease
C. Sand
D. Bacteria only
Correct Answer: B
7. Effluent leaving a septic tank should be:
A. Completely pathogen-free
B. Partially treated with reduced solids
C. Fully nitrified
D. Sterile
Correct Answer: B
, 8. Which system component provides most biological
treatment?
A. Distribution box
B. Soil absorption field
C. Inlet baffle
D. Pump chamber
Correct Answer: B
9. A distribution box must be level to ensure:
A. Faster flow
B. Equal effluent distribution
C. Increased pressure
D. Reduced tank size
Correct Answer: B
10. Hydraulic overloading of a drain field causes:
A. Improved treatment
ULTIMATE EXAM WITH CORRECT VERIFIED
ANSWERS
1. The primary function of an onsite wastewater system is
to:
A. Store sewage indefinitely
B. Treat and disperse effluent into soil
C. Evaporate all wastewater
D. Remove nutrients only
Correct Answer: B
Rationale: Onsite systems provide treatment and safe soil
absorption.
2. The most critical soil property affecting absorption field
performance is:
A. Color
B. Permeability
C. Temperature
D. Depth only
Correct Answer: B
,3. A percolation rate that is too fast indicates:
A. Poor drainage
B. Risk of groundwater contamination
C. Excess treatment
D. Low infiltration
Correct Answer: B
4. Minimum vertical separation between trench bottom and
groundwater protects:
A. Pipe integrity
B. Public health and treatment effectiveness
C. Pump operation
D. Tank strength
Correct Answer: B
5. Septic tank detention time is primarily determined by:
A. Soil type
,B. Tank volume and flow rate
C. Pipe material
D. Ground slope
Correct Answer: B
6. The scum layer in a septic tank consists mainly of:
A. Heavy solids
B. Floating fats, oils, and grease
C. Sand
D. Bacteria only
Correct Answer: B
7. Effluent leaving a septic tank should be:
A. Completely pathogen-free
B. Partially treated with reduced solids
C. Fully nitrified
D. Sterile
Correct Answer: B
, 8. Which system component provides most biological
treatment?
A. Distribution box
B. Soil absorption field
C. Inlet baffle
D. Pump chamber
Correct Answer: B
9. A distribution box must be level to ensure:
A. Faster flow
B. Equal effluent distribution
C. Increased pressure
D. Reduced tank size
Correct Answer: B
10. Hydraulic overloading of a drain field causes:
A. Improved treatment
