Texas Commission on Environmental Quality | Class C Water Operator Licensing
TCEQ Class C Water Operator License
Examination 2026/2027 | Verified Questions
Texas Commission on Environmental Quality | Class C Water Operator Licensing | Professional Water
Operator Candidates
100 Verified Questions | 5 Core Domains | Academic Year 2026/2027
Prepared by
Texas Commission on Environmental Quality | Class C Water Operator Licensing
Class C Water Operator License Examination Actual Exam | Academic Year 2026/2027
TCEQ Class C Water Operator License Examination 2026/2027 | Verified Questions
,INTRODUCTION
This document contains 100 Verified Questions covering the full TCEQ Class C Water Operator License
Examination administered under the authority of the Texas Commission on Environmental Quality. The
questions address all five core domains of the official content outline: Regulations, Safe Drinking Water
Act & TCEQ Compliance; Water Sources, Treatment Processes & Water Quality; Disinfection, Distribution
Systems & Cross-Connection Control; Pumps, Hydraulics & Math Calculations; and Safety,
Recordkeeping & Laboratory Testing. Content is original and designed to reinforce the official Class C
Water Operator License course objectives for actual exam readiness and water operations proficiency,
aligned to the 2026/2027 academic year. Candidates are expected to demonstrate mastery of 30 TAC
Chapter 290, the Safe Drinking Water Act, Texas Water Code provisions, and foundational water
treatment and distribution methodology.
ACTUAL QUESTIONS
Domain 1: Regulations, Safe Drinking Water Act & TCEQ Compliance
Question 1. Which Texas Administrative Code chapter contains the primary drinking water
standards and public water system requirements administered by TCEQ?
A. 30 TAC Chapter 285
B. 30 TAC Chapter 290
C. 30 TAC Chapter 217
D. 30 TAC Chapter 305
Correct Answer: B
Rationale: 30 TAC Chapter 290 establishes the rules for public water systems in Texas, including
treatment, distribution, monitoring, reporting, and operator licensing requirements under TCEQ
authority.
Question 2. The Safe Drinking Water Act (SDWA) is administered at the federal level
primarily by which agency?
A. Occupational Safety and Health Administration (OSHA)
B. U.S. Department of Agriculture
C. Federal Emergency Management Agency
D. U.S. Environmental Protection Agency (EPA)
Correct Answer: D
Rationale: The Safe Drinking Water Act authorizes the U.S. EPA to set national primary drinking water
regulations. TCEQ implements and enforces these standards in Texas through 30 TAC Chapter 290.
Question 3. A Maximum Contaminant Level (MCL) is defined as:
A. The highest level of a contaminant allowed in drinking water that is delivered to any user of a
public water system
B. The ideal aesthetic concentration of a mineral
C. The minimum residual disinfectant required at the plant only
D. The maximum pressure allowed in a distribution main
Correct Answer: A
Rationale: Under the SDWA and 30 TAC Chapter 290, an MCL is the maximum permissible level of a
contaminant in water that is delivered to any user of a public water system. Exceeding an MCL can
trigger public notice and corrective action requirements.
Question 4. Public water systems in Texas are classified in part by the number of
connections or population served. A system serving at least 15 service connections or 25
individuals at least 60 days per year is considered a:
TCEQ Class C Water Operator License Examination 2026/2027 | Verified Questions
, A. Private well only
B. Non-public irrigation system
C. Public water system
D. Industrial process water system exclusively
Correct Answer: C
Rationale: TCEQ and EPA define a public water system as one that provides water for human
consumption to at least 15 service connections or serves at least 25 individuals at least 60 days out of the
year.
Question 5. Which of the following is a primary responsibility of a licensed Class C Water
Operator in Texas?
A. Designing new treatment plant architecture without an engineer
B. Operating and maintaining the public water system in compliance with TCEQ rules and ensuring
safe drinking water
C. Setting retail water rates for the entire state
D. Issuing building permits for residential construction
Correct Answer: B
Rationale: Class C operators are licensed to operate public water systems of specified capacity. Their
core duty is to produce and distribute water that meets all applicable quality, monitoring, and
operational standards under 30 TAC Chapter 290.
Question 6. The Lead and Copper Rule requires public water systems to:
A. Monitor lead and copper at customer taps and implement corrosion control treatment when action
levels are exceeded
B. Eliminate all copper piping immediately
C. Test only raw source water for lead
D. Report lead results only every ten years
Correct Answer: A
Rationale: The Lead and Copper Rule (incorporated into Texas rules) requires tap sampling,
comparison to action levels, and implementation of corrosion control or other measures when action
levels are exceeded to reduce exposure at the tap.
Question 7. A Treatment Technique (TT) requirement differs from an MCL in that a TT:
A. Sets a numerical concentration limit only
B. Applies exclusively to secondary contaminants
C. Is used only for radiological contaminants
D. Requires a specific process or procedure (such as filtration or corrosion control) instead of a
numerical concentration limit
Correct Answer: D
Rationale: For some contaminants, EPA and TCEQ establish Treatment Technique requirements rather
than MCLs when monitoring the contaminant itself is not feasible. Examples include the Surface Water
Treatment Rule filtration and disinfection requirements.
Question 8. Under TCEQ rules, a public water system must notify the public when:
A. Only when the system changes its logo
B. Only during routine annual reports regardless of violations
C. Certain violations of MCLs, treatment techniques, or monitoring requirements occur, according to
the required tier and timeframe
D. Never, if the violation is corrected within 30 days
Correct Answer: C
TCEQ Class C Water Operator License Examination 2026/2027 | Verified Questions
TCEQ Class C Water Operator License
Examination 2026/2027 | Verified Questions
Texas Commission on Environmental Quality | Class C Water Operator Licensing | Professional Water
Operator Candidates
100 Verified Questions | 5 Core Domains | Academic Year 2026/2027
Prepared by
Texas Commission on Environmental Quality | Class C Water Operator Licensing
Class C Water Operator License Examination Actual Exam | Academic Year 2026/2027
TCEQ Class C Water Operator License Examination 2026/2027 | Verified Questions
,INTRODUCTION
This document contains 100 Verified Questions covering the full TCEQ Class C Water Operator License
Examination administered under the authority of the Texas Commission on Environmental Quality. The
questions address all five core domains of the official content outline: Regulations, Safe Drinking Water
Act & TCEQ Compliance; Water Sources, Treatment Processes & Water Quality; Disinfection, Distribution
Systems & Cross-Connection Control; Pumps, Hydraulics & Math Calculations; and Safety,
Recordkeeping & Laboratory Testing. Content is original and designed to reinforce the official Class C
Water Operator License course objectives for actual exam readiness and water operations proficiency,
aligned to the 2026/2027 academic year. Candidates are expected to demonstrate mastery of 30 TAC
Chapter 290, the Safe Drinking Water Act, Texas Water Code provisions, and foundational water
treatment and distribution methodology.
ACTUAL QUESTIONS
Domain 1: Regulations, Safe Drinking Water Act & TCEQ Compliance
Question 1. Which Texas Administrative Code chapter contains the primary drinking water
standards and public water system requirements administered by TCEQ?
A. 30 TAC Chapter 285
B. 30 TAC Chapter 290
C. 30 TAC Chapter 217
D. 30 TAC Chapter 305
Correct Answer: B
Rationale: 30 TAC Chapter 290 establishes the rules for public water systems in Texas, including
treatment, distribution, monitoring, reporting, and operator licensing requirements under TCEQ
authority.
Question 2. The Safe Drinking Water Act (SDWA) is administered at the federal level
primarily by which agency?
A. Occupational Safety and Health Administration (OSHA)
B. U.S. Department of Agriculture
C. Federal Emergency Management Agency
D. U.S. Environmental Protection Agency (EPA)
Correct Answer: D
Rationale: The Safe Drinking Water Act authorizes the U.S. EPA to set national primary drinking water
regulations. TCEQ implements and enforces these standards in Texas through 30 TAC Chapter 290.
Question 3. A Maximum Contaminant Level (MCL) is defined as:
A. The highest level of a contaminant allowed in drinking water that is delivered to any user of a
public water system
B. The ideal aesthetic concentration of a mineral
C. The minimum residual disinfectant required at the plant only
D. The maximum pressure allowed in a distribution main
Correct Answer: A
Rationale: Under the SDWA and 30 TAC Chapter 290, an MCL is the maximum permissible level of a
contaminant in water that is delivered to any user of a public water system. Exceeding an MCL can
trigger public notice and corrective action requirements.
Question 4. Public water systems in Texas are classified in part by the number of
connections or population served. A system serving at least 15 service connections or 25
individuals at least 60 days per year is considered a:
TCEQ Class C Water Operator License Examination 2026/2027 | Verified Questions
, A. Private well only
B. Non-public irrigation system
C. Public water system
D. Industrial process water system exclusively
Correct Answer: C
Rationale: TCEQ and EPA define a public water system as one that provides water for human
consumption to at least 15 service connections or serves at least 25 individuals at least 60 days out of the
year.
Question 5. Which of the following is a primary responsibility of a licensed Class C Water
Operator in Texas?
A. Designing new treatment plant architecture without an engineer
B. Operating and maintaining the public water system in compliance with TCEQ rules and ensuring
safe drinking water
C. Setting retail water rates for the entire state
D. Issuing building permits for residential construction
Correct Answer: B
Rationale: Class C operators are licensed to operate public water systems of specified capacity. Their
core duty is to produce and distribute water that meets all applicable quality, monitoring, and
operational standards under 30 TAC Chapter 290.
Question 6. The Lead and Copper Rule requires public water systems to:
A. Monitor lead and copper at customer taps and implement corrosion control treatment when action
levels are exceeded
B. Eliminate all copper piping immediately
C. Test only raw source water for lead
D. Report lead results only every ten years
Correct Answer: A
Rationale: The Lead and Copper Rule (incorporated into Texas rules) requires tap sampling,
comparison to action levels, and implementation of corrosion control or other measures when action
levels are exceeded to reduce exposure at the tap.
Question 7. A Treatment Technique (TT) requirement differs from an MCL in that a TT:
A. Sets a numerical concentration limit only
B. Applies exclusively to secondary contaminants
C. Is used only for radiological contaminants
D. Requires a specific process or procedure (such as filtration or corrosion control) instead of a
numerical concentration limit
Correct Answer: D
Rationale: For some contaminants, EPA and TCEQ establish Treatment Technique requirements rather
than MCLs when monitoring the contaminant itself is not feasible. Examples include the Surface Water
Treatment Rule filtration and disinfection requirements.
Question 8. Under TCEQ rules, a public water system must notify the public when:
A. Only when the system changes its logo
B. Only during routine annual reports regardless of violations
C. Certain violations of MCLs, treatment techniques, or monitoring requirements occur, according to
the required tier and timeframe
D. Never, if the violation is corrected within 30 days
Correct Answer: C
TCEQ Class C Water Operator License Examination 2026/2027 | Verified Questions
