ALABAMA ONSITE WASTEWATER INSTALLER CERTIFICATION
AOWB INSTALLER LICENSURE EXAMINATION
Updated Questions & Answers With Rationale
A+ GRADED| BRAND NEW RELEASE!
This comprehensive examination is designed to evaluate the knowledge and
competency of individuals preparing for the Alabama Onsite Wastewater Board
(AOWB) installer licensure examination. The content aligns with the current Alabama
Onsite Wastewater Board Administrative Code (Chapter 628-X-3) and the Alabama
Department of Public Health (ADPH) Onsite Sewage Treatment and Disposal Rules
(420-3-1). The exam focuses on licensing requirements, system components, soil
evaluation, installation procedures, hydraulics, and regulatory compliance. Emphasis is
placed on understanding the practical application of Alabama statutes and rules
governing onsite wastewater systems.
DOMAINS COVERED:
1. Licensing and Qualification Requirements
2. System Components and Design
3. Soil Evaluation and Site Assessment
4. Installation Procedures and Best Practices
5. Hydraulics and Wastewater Flow
6. Regulatory Compliance
7. Safety and Professional Conduct
1. Which of the following is the primary purpose of a septic tank?
A. Disinfect all wastewater
B. Separate solids and provide anaerobic treatment
C. Pump wastewater directly into groundwater
D. Aerate wastewater continuously
Answer: B
,Rationale: The septic tank separates solids, allows oils and grease to float as scum,
and provides anaerobic digestion of organic matter.
2. Which material is commonly used for septic tank construction?
A. Paperboard
B. Concrete
C. Untreated fabric
D. Cardboard
Answer: B
Rationale: Concrete is commonly used because it is durable and structurally suitable
for septic tank construction.
3. What is the liquid portion leaving a septic tank called?
A. Sludge
B. Scum
C. Effluent
D. Grease
Answer: C
Rationale: Effluent is the liquid wastewater discharged from the septic tank to the
treatment or dispersal system.
4. What is sludge?
A. Floating grease and oils
B. Settled solids at the bottom of the tank
C. The liquid portion of wastewater
,D. A type of pump
Answer: B
Rationale: Sludge consists of settled solids that accumulate at the bottom of the
septic tank.
5. What is scum?
A. Floating grease and oils
B. Settled solids at the bottom of the tank
C. The liquid portion of wastewater
D. A type of pump
Answer: A
Rationale: Scum is the layer of floating grease, oils, and light materials that
accumulates on top of the liquid in a septic tank.
6. What is the purpose of an inlet baffle or inlet device?
A. Prevent excessive solids from leaving the tank
B. Slow incoming wastewater while limiting turbulence that could disturb settled
solids
C. Increase sludge production
D. Add drinking water
Answer: B
Rationale: The inlet baffle slows incoming wastewater and limits turbulence that
could disturb settled solids.
7. What is the purpose of an outlet baffle or outlet device?
, A. Prevent excessive solids from leaving the tank
B. Increase sludge production
C. Add drinking water
D. Eliminate the need for a drainfield
Answer: A
Rationale: Proper outlet protection helps keep floating and settled solids inside the
tank.
8. What is a drainfield designed to do?
A. Manufacture potable water
B. Receive and disperse treated septic tank effluent
C. Store household chemicals
D. Collect roof runoff
Answer: B
Rationale: The drainfield distributes effluent into suitable soil for additional
treatment and dispersal.
9. Which soil characteristic is especially important when evaluating a wastewater
dispersal area?
A. Color of the homeowner's building
B. Soil permeability and ability to accept effluent
C. Fence height
D. Roof material
Answer: B
AOWB INSTALLER LICENSURE EXAMINATION
Updated Questions & Answers With Rationale
A+ GRADED| BRAND NEW RELEASE!
This comprehensive examination is designed to evaluate the knowledge and
competency of individuals preparing for the Alabama Onsite Wastewater Board
(AOWB) installer licensure examination. The content aligns with the current Alabama
Onsite Wastewater Board Administrative Code (Chapter 628-X-3) and the Alabama
Department of Public Health (ADPH) Onsite Sewage Treatment and Disposal Rules
(420-3-1). The exam focuses on licensing requirements, system components, soil
evaluation, installation procedures, hydraulics, and regulatory compliance. Emphasis is
placed on understanding the practical application of Alabama statutes and rules
governing onsite wastewater systems.
DOMAINS COVERED:
1. Licensing and Qualification Requirements
2. System Components and Design
3. Soil Evaluation and Site Assessment
4. Installation Procedures and Best Practices
5. Hydraulics and Wastewater Flow
6. Regulatory Compliance
7. Safety and Professional Conduct
1. Which of the following is the primary purpose of a septic tank?
A. Disinfect all wastewater
B. Separate solids and provide anaerobic treatment
C. Pump wastewater directly into groundwater
D. Aerate wastewater continuously
Answer: B
,Rationale: The septic tank separates solids, allows oils and grease to float as scum,
and provides anaerobic digestion of organic matter.
2. Which material is commonly used for septic tank construction?
A. Paperboard
B. Concrete
C. Untreated fabric
D. Cardboard
Answer: B
Rationale: Concrete is commonly used because it is durable and structurally suitable
for septic tank construction.
3. What is the liquid portion leaving a septic tank called?
A. Sludge
B. Scum
C. Effluent
D. Grease
Answer: C
Rationale: Effluent is the liquid wastewater discharged from the septic tank to the
treatment or dispersal system.
4. What is sludge?
A. Floating grease and oils
B. Settled solids at the bottom of the tank
C. The liquid portion of wastewater
,D. A type of pump
Answer: B
Rationale: Sludge consists of settled solids that accumulate at the bottom of the
septic tank.
5. What is scum?
A. Floating grease and oils
B. Settled solids at the bottom of the tank
C. The liquid portion of wastewater
D. A type of pump
Answer: A
Rationale: Scum is the layer of floating grease, oils, and light materials that
accumulates on top of the liquid in a septic tank.
6. What is the purpose of an inlet baffle or inlet device?
A. Prevent excessive solids from leaving the tank
B. Slow incoming wastewater while limiting turbulence that could disturb settled
solids
C. Increase sludge production
D. Add drinking water
Answer: B
Rationale: The inlet baffle slows incoming wastewater and limits turbulence that
could disturb settled solids.
7. What is the purpose of an outlet baffle or outlet device?
, A. Prevent excessive solids from leaving the tank
B. Increase sludge production
C. Add drinking water
D. Eliminate the need for a drainfield
Answer: A
Rationale: Proper outlet protection helps keep floating and settled solids inside the
tank.
8. What is a drainfield designed to do?
A. Manufacture potable water
B. Receive and disperse treated septic tank effluent
C. Store household chemicals
D. Collect roof runoff
Answer: B
Rationale: The drainfield distributes effluent into suitable soil for additional
treatment and dispersal.
9. Which soil characteristic is especially important when evaluating a wastewater
dispersal area?
A. Color of the homeowner's building
B. Soil permeability and ability to accept effluent
C. Fence height
D. Roof material
Answer: B
