Texas Water Operator License Practice Test
TCEQ license practice written to each license’s Need-to-Know Criteria, 70% to pass.
Why do lift station controls alternate the lead pump between cycles?
643 original questions with explanations · 7 practice exams · a free drill for every exam
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The Texas Commission on Environmental Quality licenses public water system, wastewater treatment and collection system operators. Every exam is taken at a TCEQ-approved computer-based testing center and needs 70 percent.
Water treatment
- TCEQ Class D Water Practice Test
100-question practice exam · 70% to pass
- TCEQ Class C Groundwater Practice Test
100-question practice exam · 70% to pass
- TCEQ Class C Surface Water Practice Test
100-question practice exam · 70% to pass
Water distribution
- TCEQ Class C Water Distribution Practice Test
100-question practice exam · 70% to pass
Wastewater treatment
- TCEQ Class D Wastewater Practice Test
100-question practice exam · 70% to pass
- TCEQ Class C Wastewater Practice Test
100-question practice exam · 70% to pass
Wastewater collection
- TCEQ Wastewater Collection Class I Practice Test
100-question practice exam · 70% to pass
Not built yet: Class B and Class A water, Class B and A wastewater and Collection Class II and III. TCEQ does not publish question counts or weights for any of its exams, so our practice exams use equal shares of the published subjects.
Sit a full practice exam
100 questions across the published subjects, with a score for every area and an explanation for every option.
Or pick your exam belowCommon questions
What score do I need on a TCEQ exam?
TCEQ requires a minimum score of 70 percent.
How much does a TCEQ license cost?
The application fee is $111 ($74 for a provisional Class D); each computer-based testing center sets its own testing fee.
How many questions are on the TCEQ Class D exam?
TCEQ does not publish the question count or time limit for Class D or Class C exams. Its licensing page notes that the Class A exam runs six hours.
Do Class D licenses renew?
Most Class D water licenses are not renewable; operators upgrade to Class C. Class C water and Class C and D wastewater renewals need 30 continuing education hours (water includes 2 hours of resiliency training).
Practice by topic
- Source Water and Wells
- Coagulation, Sedimentation and Filtration
- Water Disinfection and Chlorination
- Corrosion, Iron, Manganese and Fluoride
- Water Lab and Sampling
- Water Mains, Valves and Hydrants
- Distribution Hydraulics and Storage
- Cross-Connection and Backflow
- Drinking Water Regulations
- Water Math
- Pumps, Motors and Equipment
- Operator Safety
- Management, Records and Customer Service
- Preliminary and Primary Treatment
- Activated Sludge
- Trickling Filters, RBCs and Ponds
- Sludge Digestion and Biosolids
- Wastewater Disinfection and Effluent
- Wastewater Lab and Sampling
- Wastewater Permits and Regulations
- Wastewater Math
- Sewer Cleaning and Inspection
- Collection System Maintenance
- Inflow, Infiltration and Overflows
- Lift Stations
Requirements, subjects and fees checked November 2026 on tceq.texas.gov: TCEQ: Public Water System Operators licensing requirements · TCEQ: Need-to-Know Criteria for public water system operators · TCEQ: Wastewater Treatment Plant and Collection System Operators · TCEQ: What applicants for wastewater licenses need to know · TCEQ: Licensing exams (computer-based testing, authorized aids) · TCEQ: Continuing education hours to renew by license type (PDF).
Game Assessment Prep is an independent practice site, not affiliated with or endorsed by Water Professionals International (WPI, formerly ABC), the California State Water Resources Control Board or the Texas Commission on Environmental Quality. Every question is original; none is taken from a certification exam, an official study guide or another prep provider.