TCEQ WASTEWATER CLASS D LICENSE PREP
ACTUAL EXAM 2026/2027 | QUESTIONS WITH
CORRECT ANSWERS | COMPREHENSIVE PRACTICE
TEST ALIGNED WITH TCEQ CLASS D WASTEWATER
OPERATOR CERTIFICATION BLUEPRINT | PASS
GUARANTEED - A+ GRADED
CORE DOMAINS
• Wastewater Regulations & Compliance
• Safety & Confined Space
• Preliminary & Primary Treatment
• Secondary Treatment & Biological Processes
• Disinfection & Effluent Quality
• Sludge Handling & Solids Management
• Laboratory Sampling & Testing
• Basic Hydraulics & Equipment
• Math Calculations & Process Control
• Troubleshooting & Maintenance
INTRODUCTION
This comprehensive assessment evaluates the candidate's mastery of the
foundational knowledge required for the TCEQ Class D Wastewater
Operator certification examination. It measures competency across
wastewater treatment processes, collection systems, safety protocols,
laboratory procedures, and regulatory compliance. The examination
,employs multiple-choice and scenario-based questions that test real-
world application, critical decision-making, and adherence to TCEQ
standards. Candidates must demonstrate the ability to operate total
retention lagoons and collection systems serving populations of 1,500 or
fewer, apply safety practices, and comply with 30 TAC Chapter 217
design criteria. This evaluation ensures successful participants possess
the technical expertise necessary for Class D certification. The TCEQ
Class D license authorizes operators of total retention lagoon systems or
collection systems serving a population of 1,500 or less . A minimum
score of 70% is required to pass .
SECTION ONE: QUESTIONS 1–100
1. What is the primary scope of authority for a TCEQ Class D
Wastewater Operator license?
A. Activated sludge plants and collection systems serving up to 10,000
population
B. Total retention lagoons and collection systems serving a population of
1,500 or less
C. Any wastewater treatment facility regardless of flow or population
D. Collection systems only, with no treatment facility authorization
B. Total retention lagoons and collection systems serving a
population of 1,500 or less
RATIONALE: A Class D wastewater operator license in Texas is
specifically authorized for operators of total retention lagoon systems or
collection systems serving a population of 1,500 or less. This is the
entry-level license in the Texas wastewater operator hierarchy .
2. What is the minimum passing score required for the TCEQ Class
D Wastewater Operator examination?
,A. 60%
B. 65%
C. 70%
D. 75%
C. 70%
RATIONALE: All TCEQ occupational licenses require an
individual to pass the applicable TCEQ exam with a minimum score of
70 percent .
3. What is the application fee for a TCEQ Wastewater Class D
license?
A. $50
B. $74
C. $111
D. $150
B. $74
RATIONALE: The application fee for a Wastewater Class D license
is $74. The standard application fee for other wastewater treatment
licenses is $111 .
4. What training course is required to apply for a Wastewater Class
D license?
A. Basic Wastewater Operation only
B. Activated Sludge and Wastewater Collection
C. Basic Wastewater Operation plus two electives
D. No training is required
A. Basic Wastewater Operation only
, RATIONALE: The Wastewater Class D licensing requirement
includes only the Basic Wastewater Operation course. No additional
elective courses or experience are required for Class D .
5. How many years of work experience are required for a
Wastewater Class D license?
A. None
B. 1 year
C. 2 years
D. 5 years
A. None
RATIONALE: The Wastewater Class D license has no work
experience requirement. It is the entry-level license in the Texas
wastewater operator progression .
6. What is the license class hierarchy for Texas wastewater
operators, from lowest to highest?
A. Class A → Class B → Class C → Class D
B. Class D → Class C → Class B → Class A
C. Class C → Class D → Class A → Class B
D. Class B → Class D → Class C → Class A
B. Class D → Class C → Class B → Class A
RATIONALE: Texas wastewater operator licenses progress from
Class D (entry level) to Class C, then Class B, and finally Class A
(highest). Each class requires progressively more experience, education,
and examination .
ACTUAL EXAM 2026/2027 | QUESTIONS WITH
CORRECT ANSWERS | COMPREHENSIVE PRACTICE
TEST ALIGNED WITH TCEQ CLASS D WASTEWATER
OPERATOR CERTIFICATION BLUEPRINT | PASS
GUARANTEED - A+ GRADED
CORE DOMAINS
• Wastewater Regulations & Compliance
• Safety & Confined Space
• Preliminary & Primary Treatment
• Secondary Treatment & Biological Processes
• Disinfection & Effluent Quality
• Sludge Handling & Solids Management
• Laboratory Sampling & Testing
• Basic Hydraulics & Equipment
• Math Calculations & Process Control
• Troubleshooting & Maintenance
INTRODUCTION
This comprehensive assessment evaluates the candidate's mastery of the
foundational knowledge required for the TCEQ Class D Wastewater
Operator certification examination. It measures competency across
wastewater treatment processes, collection systems, safety protocols,
laboratory procedures, and regulatory compliance. The examination
,employs multiple-choice and scenario-based questions that test real-
world application, critical decision-making, and adherence to TCEQ
standards. Candidates must demonstrate the ability to operate total
retention lagoons and collection systems serving populations of 1,500 or
fewer, apply safety practices, and comply with 30 TAC Chapter 217
design criteria. This evaluation ensures successful participants possess
the technical expertise necessary for Class D certification. The TCEQ
Class D license authorizes operators of total retention lagoon systems or
collection systems serving a population of 1,500 or less . A minimum
score of 70% is required to pass .
SECTION ONE: QUESTIONS 1–100
1. What is the primary scope of authority for a TCEQ Class D
Wastewater Operator license?
A. Activated sludge plants and collection systems serving up to 10,000
population
B. Total retention lagoons and collection systems serving a population of
1,500 or less
C. Any wastewater treatment facility regardless of flow or population
D. Collection systems only, with no treatment facility authorization
B. Total retention lagoons and collection systems serving a
population of 1,500 or less
RATIONALE: A Class D wastewater operator license in Texas is
specifically authorized for operators of total retention lagoon systems or
collection systems serving a population of 1,500 or less. This is the
entry-level license in the Texas wastewater operator hierarchy .
2. What is the minimum passing score required for the TCEQ Class
D Wastewater Operator examination?
,A. 60%
B. 65%
C. 70%
D. 75%
C. 70%
RATIONALE: All TCEQ occupational licenses require an
individual to pass the applicable TCEQ exam with a minimum score of
70 percent .
3. What is the application fee for a TCEQ Wastewater Class D
license?
A. $50
B. $74
C. $111
D. $150
B. $74
RATIONALE: The application fee for a Wastewater Class D license
is $74. The standard application fee for other wastewater treatment
licenses is $111 .
4. What training course is required to apply for a Wastewater Class
D license?
A. Basic Wastewater Operation only
B. Activated Sludge and Wastewater Collection
C. Basic Wastewater Operation plus two electives
D. No training is required
A. Basic Wastewater Operation only
, RATIONALE: The Wastewater Class D licensing requirement
includes only the Basic Wastewater Operation course. No additional
elective courses or experience are required for Class D .
5. How many years of work experience are required for a
Wastewater Class D license?
A. None
B. 1 year
C. 2 years
D. 5 years
A. None
RATIONALE: The Wastewater Class D license has no work
experience requirement. It is the entry-level license in the Texas
wastewater operator progression .
6. What is the license class hierarchy for Texas wastewater
operators, from lowest to highest?
A. Class A → Class B → Class C → Class D
B. Class D → Class C → Class B → Class A
C. Class C → Class D → Class A → Class B
D. Class B → Class D → Class C → Class A
B. Class D → Class C → Class B → Class A
RATIONALE: Texas wastewater operator licenses progress from
Class D (entry level) to Class C, then Class B, and finally Class A
(highest). Each class requires progressively more experience, education,
and examination .
