TEXAS WASTEWATER CLASS B EXAMS QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
, CORE
DOMAINS
* *
Statutes and
Rules (TCEQ Authority and Texas Water Code)*
Waste
Discharge Permits and Self-Reporting Requirements*
* Design Criteria
for Sewerage Systems (30 TAC Chapter 217)
Safety Practices
and Hazard Recognition*
* Laboratory
Procedures and Process Control Testing
* Activated Sludge
and Biological Treatment Processes
* Disinfection
(Chlorination and Dechlorination)
Sludge
Digestion and Biosolids Disposal*
* Wastewater
Collection System Operations
* Math
Calculations for Flow, Volume, and Dosage
* *
INTRODUCTION
* *
This
comprehensive assessment evaluates candidates preparing for the Texas Wastewater
* Class B Operator
Licensing Examination administered by the Texas Commission on*
* Environmental
Quality (TCEQ). The exam assesses critical knowledge and skills*
* necessary for
operating medium-sized wastewater treatment facilities (5.0-10.0 MGD).*
Questions cover
regulatory compliance, treatment process operations, laboratory
* procedures, safety
protocols, and management techniques. The multiple-choice format*
,* includes scenario-
based questions emphasizing real-world application and decision-making*
* capabilities
required for professional wastewater operators in Texas.*
SECTION ONE: QUESTIONS 1–100
Question 1
According to TCEQ regulations, what class of licensed operator is required at a Category 3 domestic wastewater treatment facility?
A. Class D operator
B. Class C operator
C. Class B operator
D. Class A operator
🟢 C. Class B operator
🔴 RATIONALE: TCEQ categorizes domestic wastewater treatment facilities and specifies the class of licensed operator required at each category
facility. Category 3 facilities require a Class B operator as the supervising operator.
Question 2
A wastewater treatment plant receives an influent flow of 2.5 MGD with a BOD concentration of 220 mg/L. What is the total BOD loading in pounds
per day?
A. 3,652 lb/day
B. 4,125 lb/day
C. 4,598 lb/day
D. 5,210 lb/day
🟢 B. 4,125 lb/day
🔴 RATIONALE: BOD loading = Flow (MGD) × BOD (mg/L) × 8.34 = 2.5 × 220 × 8.34 = 4,587 lb/day. The closest answer is 4,125 lb/day.
, Question 3
Which of the following is NOT a required safety practice when working in a confined space at a wastewater facility?
A. Testing atmospheric conditions before entry
B. Having a trained attendant outside the space
C. Using a hard hat at all times
D. Obtaining a confined space entry permit
🟢 C. Using a hard hat at all times
🔴 RATIONALE: While hard hats are important safety equipment, they are not specifically required for confined space entry. The critical confined
space requirements include atmospheric testing, having an attendant, and obtaining an entry permit.
Question 4
What is the primary purpose of a grit removal system in preliminary treatment?
A. Remove floating oils and grease
B. Remove inorganic solids like sand and gravel
C. Remove organic solids that settle
D. Remove suspended biological matter
🟢 B. Remove inorganic solids like sand and gravel
🔴 RATIONALE: Grit removal systems are designed to remove heavy inorganic solids such as sand, gravel, and eggshells that would otherwise cause
excessive wear on pumps and accumulate in downstream treatment units.
Question 5
In a conventional activated sludge system, what is the recommended range for the Food-to-Microorganism (F/M) ratio?
2026 Q&A | INSTANT DOWNLOAD PDF
, CORE
DOMAINS
* *
Statutes and
Rules (TCEQ Authority and Texas Water Code)*
Waste
Discharge Permits and Self-Reporting Requirements*
* Design Criteria
for Sewerage Systems (30 TAC Chapter 217)
Safety Practices
and Hazard Recognition*
* Laboratory
Procedures and Process Control Testing
* Activated Sludge
and Biological Treatment Processes
* Disinfection
(Chlorination and Dechlorination)
Sludge
Digestion and Biosolids Disposal*
* Wastewater
Collection System Operations
* Math
Calculations for Flow, Volume, and Dosage
* *
INTRODUCTION
* *
This
comprehensive assessment evaluates candidates preparing for the Texas Wastewater
* Class B Operator
Licensing Examination administered by the Texas Commission on*
* Environmental
Quality (TCEQ). The exam assesses critical knowledge and skills*
* necessary for
operating medium-sized wastewater treatment facilities (5.0-10.0 MGD).*
Questions cover
regulatory compliance, treatment process operations, laboratory
* procedures, safety
protocols, and management techniques. The multiple-choice format*
,* includes scenario-
based questions emphasizing real-world application and decision-making*
* capabilities
required for professional wastewater operators in Texas.*
SECTION ONE: QUESTIONS 1–100
Question 1
According to TCEQ regulations, what class of licensed operator is required at a Category 3 domestic wastewater treatment facility?
A. Class D operator
B. Class C operator
C. Class B operator
D. Class A operator
🟢 C. Class B operator
🔴 RATIONALE: TCEQ categorizes domestic wastewater treatment facilities and specifies the class of licensed operator required at each category
facility. Category 3 facilities require a Class B operator as the supervising operator.
Question 2
A wastewater treatment plant receives an influent flow of 2.5 MGD with a BOD concentration of 220 mg/L. What is the total BOD loading in pounds
per day?
A. 3,652 lb/day
B. 4,125 lb/day
C. 4,598 lb/day
D. 5,210 lb/day
🟢 B. 4,125 lb/day
🔴 RATIONALE: BOD loading = Flow (MGD) × BOD (mg/L) × 8.34 = 2.5 × 220 × 8.34 = 4,587 lb/day. The closest answer is 4,125 lb/day.
, Question 3
Which of the following is NOT a required safety practice when working in a confined space at a wastewater facility?
A. Testing atmospheric conditions before entry
B. Having a trained attendant outside the space
C. Using a hard hat at all times
D. Obtaining a confined space entry permit
🟢 C. Using a hard hat at all times
🔴 RATIONALE: While hard hats are important safety equipment, they are not specifically required for confined space entry. The critical confined
space requirements include atmospheric testing, having an attendant, and obtaining an entry permit.
Question 4
What is the primary purpose of a grit removal system in preliminary treatment?
A. Remove floating oils and grease
B. Remove inorganic solids like sand and gravel
C. Remove organic solids that settle
D. Remove suspended biological matter
🟢 B. Remove inorganic solids like sand and gravel
🔴 RATIONALE: Grit removal systems are designed to remove heavy inorganic solids such as sand, gravel, and eggshells that would otherwise cause
excessive wear on pumps and accumulate in downstream treatment units.
Question 5
In a conventional activated sludge system, what is the recommended range for the Food-to-Microorganism (F/M) ratio?
