Texas OSSF Installer II License Examination – On-Site Sewage Facilities
Exam Coverage
1. Installer II scope and regulatory authority
2. Advanced OSSF treatment systems
3. Site evaluation and soil assessment
4. Treatment tanks and pretreatment
5. Aerobic treatment and disinfection
6. Pump tanks and dosing controls
7. Effluent dispersal and advanced distribution
8. Electrical and mechanical installation
9. Maintenance, inspection, and troubleshooting
10. Permits, records, and compliance
1. When conditions change, how should Alarms should be tested to confirm they
function properly affect the next decision?
A. It is generally optional unless a complaint is already filed.
B. It matters only when another professional requests it.
C. It can be ignored when the situation appears routine.
D. An alarm that is never tested may fail when needed.
Answer: D
Rationale: An alarm that is never tested may fail when needed.
,2. Why is the distinction contained in Primary treatment removes settleable and
floatable solids before downstream treatment important?
A. It is primarily a business preference rather than a compliance duty.
B. Pretreatment protects advanced components.
C. It applies only after the work or professional decision is completed.
D. It can be ignored when the situation appears routine.
Answer: B
Rationale: Pretreatment protects advanced components.
3. When conditions change, how should Pump tanks use level controls to manage
dosing cycles affect the next decision?
A. It matters only when another professional requests it.
B. It applies only after the work or professional decision is completed.
C. It can be ignored when the situation appears routine.
D. Controlled dosing helps distribute effluent appropriately.
Answer: D
Rationale: Controlled dosing helps distribute effluent appropriately.
4. What question should a professional ask when applying Backfill should not damage
tanks, pipes, or treatment components?
A. It is generally optional unless a complaint is already filed.
B. It applies only after the work or professional decision is completed.
C. Construction practices must protect installed equipment.
D. It applies only when an emergency has already occurred.
, Answer: C
Rationale: Construction practices must protect installed equipment.
5. How does Surface water should be diverted away from treatment and dispersal
areas influence safe and compliant work?
A. Excess water can overload the system.
B. It is primarily a business preference rather than a compliance duty.
C. It applies only after the work or professional decision is completed.
D. It can be ignored when the situation appears routine.
Answer: A
Rationale: Excess water can overload the system.
6. Why is the distinction contained in Filters and screens should be serviced as
required important?
A. It is generally optional unless a complaint is already filed.
B. It applies only after the work or professional decision is completed.
C. Clogged components can reduce hydraulic performance.
D. It is primarily a business preference rather than a compliance duty.
Answer: C
Rationale: Clogged components can reduce hydraulic performance.
7. How does Effluent distribution should be balanced across the available treatment
area influence safe and compliant work?
A. Uneven loading can reduce treatment performance.
B. It is generally optional unless a complaint is already filed.
, C. It applies only after the work or professional decision is completed.
D. It matters only when another professional requests it.
Answer: A
Rationale: Uneven loading can reduce treatment performance.
8. What evidence would best demonstrate compliance with An Installer II credential
covers a broader range of OSSF installation activities than entry-level authorization?
A. It applies only when an emergency has already occurred.
B. The license scope determines which advanced systems may be installed.
C. It applies only after the work or professional decision is completed.
D. It can be ignored when the situation appears routine.
Answer: B
Rationale: The license scope determines which advanced systems may be installed.
9. When conditions change, how should Pressure distribution systems use pumps
and piping to deliver effluent to dispersal points affect the next decision?
A. It applies only when an emergency has already occurred.
B. It applies only after the work or professional decision is completed.
C. Pressure can improve uniform application where gravity is unsuitable.
D. It can be ignored when the situation appears routine.
Answer: C
Rationale: Pressure can improve uniform application where gravity is unsuitable.
10. Which error is most likely if Primary treatment removes settleable and floatable
solids before downstream treatment is misunderstood?
Exam Coverage
1. Installer II scope and regulatory authority
2. Advanced OSSF treatment systems
3. Site evaluation and soil assessment
4. Treatment tanks and pretreatment
5. Aerobic treatment and disinfection
6. Pump tanks and dosing controls
7. Effluent dispersal and advanced distribution
8. Electrical and mechanical installation
9. Maintenance, inspection, and troubleshooting
10. Permits, records, and compliance
1. When conditions change, how should Alarms should be tested to confirm they
function properly affect the next decision?
A. It is generally optional unless a complaint is already filed.
B. It matters only when another professional requests it.
C. It can be ignored when the situation appears routine.
D. An alarm that is never tested may fail when needed.
Answer: D
Rationale: An alarm that is never tested may fail when needed.
,2. Why is the distinction contained in Primary treatment removes settleable and
floatable solids before downstream treatment important?
A. It is primarily a business preference rather than a compliance duty.
B. Pretreatment protects advanced components.
C. It applies only after the work or professional decision is completed.
D. It can be ignored when the situation appears routine.
Answer: B
Rationale: Pretreatment protects advanced components.
3. When conditions change, how should Pump tanks use level controls to manage
dosing cycles affect the next decision?
A. It matters only when another professional requests it.
B. It applies only after the work or professional decision is completed.
C. It can be ignored when the situation appears routine.
D. Controlled dosing helps distribute effluent appropriately.
Answer: D
Rationale: Controlled dosing helps distribute effluent appropriately.
4. What question should a professional ask when applying Backfill should not damage
tanks, pipes, or treatment components?
A. It is generally optional unless a complaint is already filed.
B. It applies only after the work or professional decision is completed.
C. Construction practices must protect installed equipment.
D. It applies only when an emergency has already occurred.
, Answer: C
Rationale: Construction practices must protect installed equipment.
5. How does Surface water should be diverted away from treatment and dispersal
areas influence safe and compliant work?
A. Excess water can overload the system.
B. It is primarily a business preference rather than a compliance duty.
C. It applies only after the work or professional decision is completed.
D. It can be ignored when the situation appears routine.
Answer: A
Rationale: Excess water can overload the system.
6. Why is the distinction contained in Filters and screens should be serviced as
required important?
A. It is generally optional unless a complaint is already filed.
B. It applies only after the work or professional decision is completed.
C. Clogged components can reduce hydraulic performance.
D. It is primarily a business preference rather than a compliance duty.
Answer: C
Rationale: Clogged components can reduce hydraulic performance.
7. How does Effluent distribution should be balanced across the available treatment
area influence safe and compliant work?
A. Uneven loading can reduce treatment performance.
B. It is generally optional unless a complaint is already filed.
, C. It applies only after the work or professional decision is completed.
D. It matters only when another professional requests it.
Answer: A
Rationale: Uneven loading can reduce treatment performance.
8. What evidence would best demonstrate compliance with An Installer II credential
covers a broader range of OSSF installation activities than entry-level authorization?
A. It applies only when an emergency has already occurred.
B. The license scope determines which advanced systems may be installed.
C. It applies only after the work or professional decision is completed.
D. It can be ignored when the situation appears routine.
Answer: B
Rationale: The license scope determines which advanced systems may be installed.
9. When conditions change, how should Pressure distribution systems use pumps
and piping to deliver effluent to dispersal points affect the next decision?
A. It applies only when an emergency has already occurred.
B. It applies only after the work or professional decision is completed.
C. Pressure can improve uniform application where gravity is unsuitable.
D. It can be ignored when the situation appears routine.
Answer: C
Rationale: Pressure can improve uniform application where gravity is unsuitable.
10. Which error is most likely if Primary treatment removes settleable and floatable
solids before downstream treatment is misunderstood?
