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.
Texas’s distribution operator levels. The field content is the national ABC/WPI standard; Texas-specific rules are built in.
Texas Class D Water Distribution Practice Test
Entry-level practice for the TCEQ Class D distribution license — system operation, mains and valves, flushing, pumps and storage, and basic hydraulics, with Texas rules (30 TAC 290, 35 psi minimum, CSIs).
Texas · Class CTexas Class C Water Distribution Practice Test
Practice for the TCEQ Class C distribution license — operating knowledge across operation, maintenance, water quality, hydraulics, pumps and storage, with Texas rules (30 TAC 290, residual, backflow testing, CCRs).
Texas · Class BTexas Class B Water Distribution Practice Test
Diagnose-and-correct practice for the TCEQ Class B distribution license — hydraulics, pump operating point, water-age and nitrification control, backflow selection, and Texas rules (pressure, residual, lead/copper, notices).
Texas · Class A MasterTexas Class A Water Distribution Practice Test
Master-level practice for the TCEQ Class A distribution license — large multi-pressure-zone systems: advanced hydraulics, surge and storage, optimization, and Texas regulatory depth (30 TAC 290/30, Tier 1 notices, boil-water).
Texas’s collections operator levels. The field content is the national ABC/WPI standard; Texas-specific rules are built in.
Texas Class I Wastewater Collection Practice Test
Practice for the TCEQ Class I wastewater collection license — the national ABC/WPI field core plus Texas items: 30 TAC 30 licensing, SSO reporting to TCEQ, records, and the Texas MUTCD.
Texas · Class IITexas Class II Wastewater Collection Practice Test
Practice for the TCEQ Class II collection license (0.1–1.0 MGD) — the national field core plus Texas items: 30 TAC 217 design, SSO reporting and overflow response, CE renewal, and pretreatment.
Texas · Class IIITexas Class III Wastewater Collection Practice Test
Practice for the TCEQ Class III collection license (over 1.0 MGD) — the national field core plus Texas items: operator licensing, SSO documentation, proactive O&M/I&I programs, and 30 TAC 217 design.
About the Texas operator exams
Operator certification in Texas covers several disciplines — drinking water, wastewater, distribution, and collections — which may be handled by the same agency or by separate programs (drinking water is administered by TCEQ (Texas Commission on Environmental Quality) — Occupational Licensing & Registration, Operator Certification). The exact certification structure, exam format, levels, and continuing-education requirements vary by discipline and change over time, so always confirm the current scope and eligibility directly with the certifying agency. Our practice content focuses on the underlying technical material — the same operating principles, math, regulations, and process knowledge that show up on water and wastewater operator exams nationwide.
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.