Studying for a Texas water or wastewater operator exam? You're in the right place. Pick your discipline below — each tab has the certification levels, how Texas names them, and the practice tests that match.
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Choose your certification
How Texas classifies drinking-water operators
Texas (TCEQ) licenses water operators at Class A (highest) through Class D (entry).
Full breakdown in the FAQ below.
Choose your Texas certification track
TCEQ splits Texas water operator licenses into two specialty tracks at Class C and above — Surface Water (treatment of lakes/rivers/reservoirs) and Groundwater (wells, aquifer-fed systems). Class D is a single combined entry exam covering both. Class A is a single master-level exam covering everything.
Surface Water Track
For operators of plants treating lakes, rivers, reservoirs, or GWUDI sources. Tests cover conventional treatment, SWTR, DBPs, and source-water protection.
Groundwater Track
For operators of well-fed systems. Tests cover well operation, drawdown/specific capacity, Fe/Mn removal, well disinfection, and the Groundwater Rule.
Master level — both tracks combined
Practice by topic
Drill the specific subject areas on the Texas drinking-water exam.
Texas certifies wastewater treatment operators separately from drinking-water operators. The cards below map our four wastewater practice tests to Texas's wastewater class names.
Class I → Class D
Entry-level wastewater operator. Wastewater characteristics, collection systems, preliminary/primary treatment, activated-sludge basics, disinfection, solids handling, lab work, and operator math.
Texas wastewaterClass II → Class C
Intermediate wastewater operator. Secondary treatment, process control, troubleshooting, regulations, and two-step operator math.
Texas wastewaterClass III → Class B
Advanced wastewater operator. Process optimization, nutrient removal, biosolids handling, lab analyses, and compliance for medium and large plants.
Texas wastewaterClass IV → Class A
Expert wastewater operator. Plant management, complex treatment trains, advanced nutrient removal, and large-utility regulations.
Distribution operator practice tests for Texas are coming soon. In the meantime, see the Distribution hub to get notified, or start with drinking water or wastewater — they share a lot of the same operator math and fundamentals.
Collections operator practice tests for Texas are coming soon. In the meantime, see the Collections hub to get notified, or start with drinking water or wastewater — they share a lot of the same operator math and fundamentals.
About the Texas operator exams
Water operator certification in Texas is administered by TCEQ (Texas Commission on Environmental Quality) — Occupational Licensing & Registration, Operator Certification. The exact certification structure, exam format, and continuing-education requirements vary and change over time, so always confirm the current scope and eligibility directly with the agency. Our practice content focuses on the underlying technical material — the same operating principles, math, regulations, and treatment chemistry that show up on virtually every US drinking-water operator exam.
Frequently asked questions
How does Texas classify water operators?
Are these the exact questions on the Texas exam?
Are these practice tests free?
Disclaimer: WaterOperatorPracticeTest.com is an independent study aid. We are not affiliated with TCEQ (Texas Commission on Environmental Quality) — Occupational Licensing & Registration, Operator Certification or any state primacy agency. Always confirm current exam requirements with your state's certification body.