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

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

Section 1: Regulations and Administration
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1. What does the acronym CMOM stand for?
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• A) Collection, Maintenance, Operations, and Monitoring
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• B) Capacity, Management, Operations, and Maintenance
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• C) Compliance, Monitoring, Operations, and Management
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• D) Control, Measurement, Oversight, and Maintenance
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2. What is the minimum separation distance required between a new sewer line and a po
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table water line?
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• A) 5 feet hg hg




• B) 7 feet hg hg




• C) 9 feet hg hg




• D) 12 feethg hg




3. Which agency is responsible for enforcing pollution control laws and issuing wastewat
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er discharge permits in Texas?
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• A) EPA hg




• B) TWDB hg




• C) TCEQ hg




• D) OSHA hg




4. If an accidental discharge, bypass, or sanitary sewer overflow (SSO) occurs, the respon
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sible party MUST notify the TCEQ regional office within:
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, • A) 4 hours
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• B) 12 hours
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• C) 24 hours
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• D) 48 hours
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5. TCEQ issues ___________ for waste discharges into waters of the state.
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• A) Operating certificates
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• B) Discharge permits
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• C) Compliance waivers
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• D) Water rights
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Section 2: Safety
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6. According to OSHA, shoring, sloping, or trench boxes are required for trenches that ar
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e:

• A) 3 feet or deeper
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• B) 4 feet or deeper
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• C) 5 feet or deeper
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• D) 6 feet or deeper
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7. If a trench is _____ or deeper, a portable ladder or other means of exit must be provide
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d.

• A) 3 feet
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• B) 4 feet
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• C) 5 feet
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• D) 6 feet
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8. A ladder used in a trench must extend at least _____ feet above the trench and be secu
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red.

• A) 2 feet
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• B) 3 feet
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• C) 4 feet
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, • D) 5 feet
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9. Hydrogen sulfide gas (H₂S) is best described as:
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• A) Lighter than air with a sweet odor
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• B) Colorless, flammable, toxic, with a rotten egg odor
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• C) Heavier than air with no odor
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• D) Non-toxic and odorless
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10. The excavation spoil (dirt pile) from a trench must be placed at least:
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• A) 1 foot from the edge of the trench
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• B) 2 feet from the edge of the trench
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• C) 3 feet from the edge of the trench
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• D) 4 feet from the edge of the trench
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11. A chlorine leak can be detected using:
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• A) Soapy water
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• B) Vapor from 10% ammonia
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• C) Litmus paper
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• D) A lighter
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12. Good housekeeping is most important for the operator's:
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• A) Efficiency
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• B) Safety
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• C) Reputation
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• D) Equipment longevity
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Section 3: Collection Systems and Pumps
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13. Which type of pump is most commonly used in a lift station?
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• A) Positive displacement pump
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• B) Centrifugal pump
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• C) Diaphragm pump
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, • D) Air-lift pump
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14. The minimum velocity required to keep solids in suspension in a sanitary sewer at av
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erage flow is approximately:
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• A) 1 ft/sec
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• B) 2 ft/sec
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• C) 3 ft/sec
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• D) 4 ft/sec
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15. The two most common pipe materials used in wastewater collection systems are:
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• A) Cast iron and steel
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• B) Copper and brass
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• C) Clay and PVC
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• D) Concrete and HDPE
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16. What happens when a centrifugal pump loses its prime?
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• A) The pump runs faster
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• B) The pump no longer moves liquid
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• C) The pump overheats and shuts off automatically
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• D) The pump reverses flow direction
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17. Inverted siphons are typically required when a sewer line must pass under:
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• A) A parking lot
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• B) A stream, highway, or railroad
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• C) A residential street
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• D) Another sewer line
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18. A preferred and most common method of cleaning sewer lines is:
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• A) Mechanical rodding
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• B) Chemical treatment
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• C) Hydro jet cleaning
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• D) Air scouring
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