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TEXAS ON-SITE SEWAGE FACILITY (OSSF) MAINTENANCE
PROVIDER LICENSING Exam 2026-2027 BANK QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM QUESTIONS
WILL COME FROM HERE (100% Latest Already Graded A+
1. Which Texas Administrative Code (TAC) chapter contains the primary
regulations for On-site Sewage Facility Systems (OSSFs) in Texas?
A) Chapter 220
B) Chapter 285
C) Chapter 302
D) Chapter 310
Answer: B
Explanation: 30 TAC Chapter 285 specifically governs the design,
installation, operation, and maintenance of OSSF systems in Texas. This
chapter establishes the comprehensive regulatory framework that
Maintenance Providers must follow, including permitting requirements,
system standards, and maintenance obligations. The Texas Health and
Safety Code Chapter 366 provides the statutory authority, but the
detailed administrative rules are found in TAC Chapter 285 .
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2. Under Texas law, a Maintenance Provider must be licensed to
perform which of the following tasks?
A) Install new OSSF components
B) Conduct routine inspections and maintenance
C) Issue permits for new systems
D) Conduct legal investigations of violations
Answer: B
Explanation: Maintenance Providers are specifically authorized to
perform routine inspections, testing, and maintenance of aerobic
treatment systems. They are not authorized to install new systems
(which requires Installer I or II licensure), issue permits (which is the
responsibility of the permitting authority or Designated Representative),
or conduct legal investigations (which falls to regulatory authorities) .
3. Which of the following is NOT a required element of an OSSF
maintenance contract in Texas?
A) Frequency of site visits
B) Owner's personal financial statements
C) Reporting timelines for test results
D) Notification procedures for system failures
Answer: B
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Explanation: Maintenance contracts must specify the scope of services,
visit frequency, testing requirements, reporting timelines, and failure
notification procedures. Personal financial information of the owner is
not a regulatory requirement for maintenance contracts and is
irrelevant to system compliance. The contract is a service agreement
focused on protecting public health and ensuring system performance .
4. An OSSF provider discovers a clogged diffuser in an Aerobic
Treatment Unit (ATU). Which component is directly affected by this
condition?
A) The pretreatment tank
B) The aerator/compressor system
C) The UV disinfection unit
D) The low-pressure dosing (LPD) manifold
Answer: B
Explanation: The diffuser is the component that supplies air to the
aeration tank. If it becomes clogged, the aerator or compressor cannot
effectively deliver oxygen to the wastewater, which impairs the aerobic
digestion process. This condition directly affects the aeration system's
ability to support the aerobic bacteria that break down organic matter .
5. In an ATU, what is the primary purpose of the mixed liquor?
A) To filter solids before discharge
B) To provide a medium for aerobic microorganisms to digest waste
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C) To store chlorine tablets for disinfection
D) To regulate hydraulic pressure in the spray field
Answer: B
Explanation: Mixed liquor is the combination of wastewater and
microbial biomass in the aeration tank where aerobic digestion occurs.
The suspended microorganisms consume organic matter, converting it
into carbon dioxide, water, and new cell mass. This biological treatment
process is the core function of an ATU .
6. Which disinfection method relies on the generation of free chlorine
through tablet dissolution?
A) UV light system
B) Ozone generator
C) Recirculating chlorine tablet unit
D) Sodium bisulfite injection
Answer: C
Explanation: Recirculating chlorine tablet units dissolve calcium
hypochlorite tablets to release free chlorine, providing chemical
disinfection. This is a common method approved by TCEQ for ATU
disinfection. UV systems use light, ozone generators produce ozone gas,
and sodium bisulfite is a dechlorinating agent used to neutralize
chlorine before discharge .
TEXAS ON-SITE SEWAGE FACILITY (OSSF) MAINTENANCE
PROVIDER LICENSING Exam 2026-2027 BANK QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM QUESTIONS
WILL COME FROM HERE (100% Latest Already Graded A+
1. Which Texas Administrative Code (TAC) chapter contains the primary
regulations for On-site Sewage Facility Systems (OSSFs) in Texas?
A) Chapter 220
B) Chapter 285
C) Chapter 302
D) Chapter 310
Answer: B
Explanation: 30 TAC Chapter 285 specifically governs the design,
installation, operation, and maintenance of OSSF systems in Texas. This
chapter establishes the comprehensive regulatory framework that
Maintenance Providers must follow, including permitting requirements,
system standards, and maintenance obligations. The Texas Health and
Safety Code Chapter 366 provides the statutory authority, but the
detailed administrative rules are found in TAC Chapter 285 .
,2|Page
2. Under Texas law, a Maintenance Provider must be licensed to
perform which of the following tasks?
A) Install new OSSF components
B) Conduct routine inspections and maintenance
C) Issue permits for new systems
D) Conduct legal investigations of violations
Answer: B
Explanation: Maintenance Providers are specifically authorized to
perform routine inspections, testing, and maintenance of aerobic
treatment systems. They are not authorized to install new systems
(which requires Installer I or II licensure), issue permits (which is the
responsibility of the permitting authority or Designated Representative),
or conduct legal investigations (which falls to regulatory authorities) .
3. Which of the following is NOT a required element of an OSSF
maintenance contract in Texas?
A) Frequency of site visits
B) Owner's personal financial statements
C) Reporting timelines for test results
D) Notification procedures for system failures
Answer: B
,3|Page
Explanation: Maintenance contracts must specify the scope of services,
visit frequency, testing requirements, reporting timelines, and failure
notification procedures. Personal financial information of the owner is
not a regulatory requirement for maintenance contracts and is
irrelevant to system compliance. The contract is a service agreement
focused on protecting public health and ensuring system performance .
4. An OSSF provider discovers a clogged diffuser in an Aerobic
Treatment Unit (ATU). Which component is directly affected by this
condition?
A) The pretreatment tank
B) The aerator/compressor system
C) The UV disinfection unit
D) The low-pressure dosing (LPD) manifold
Answer: B
Explanation: The diffuser is the component that supplies air to the
aeration tank. If it becomes clogged, the aerator or compressor cannot
effectively deliver oxygen to the wastewater, which impairs the aerobic
digestion process. This condition directly affects the aeration system's
ability to support the aerobic bacteria that break down organic matter .
5. In an ATU, what is the primary purpose of the mixed liquor?
A) To filter solids before discharge
B) To provide a medium for aerobic microorganisms to digest waste
, 4|Page
C) To store chlorine tablets for disinfection
D) To regulate hydraulic pressure in the spray field
Answer: B
Explanation: Mixed liquor is the combination of wastewater and
microbial biomass in the aeration tank where aerobic digestion occurs.
The suspended microorganisms consume organic matter, converting it
into carbon dioxide, water, and new cell mass. This biological treatment
process is the core function of an ATU .
6. Which disinfection method relies on the generation of free chlorine
through tablet dissolution?
A) UV light system
B) Ozone generator
C) Recirculating chlorine tablet unit
D) Sodium bisulfite injection
Answer: C
Explanation: Recirculating chlorine tablet units dissolve calcium
hypochlorite tablets to release free chlorine, providing chemical
disinfection. This is a common method approved by TCEQ for ATU
disinfection. UV systems use light, ozone generators produce ozone gas,
and sodium bisulfite is a dechlorinating agent used to neutralize
chlorine before discharge .
