Texas · TCEQ · Class D Wastewater
Texas Class D wastewater practice test
Practice for the Texas Class D wastewater operator exam with original questions bound to the official TCEQ subject scope. Start free with the daily set and the diagnostic, then open the full reviewed bank to drill any subject with the worked solution shown. It is honest practice, closed-book like the real exam, and never a promise about your result.
Last reviewed 2026-08-01. Facts link to their official source.
The facts that shape your prep
- Passing score
- Minimum passing score: 70 percent.
- Source: TCEQ Water System Operator Licensing ('Water Operator Licensing Overview': pass the applicable exam with a minimum score of 70 percent.)
- Open or closed book
- Closed book. Books and notes are prohibited; only Municipal Solid Waste Supervisor exams are open book.
- Source: TCEQ Computer-Based Testing ('Prohibited Aids During Licensing Exams' + MSW-only open-book note under 'Authorized Aids'.)
- The math on it
- Class D math: one- or two-step geometry and algebra problems involving area, volume, flow rate, and dosage rate in wastewater contexts.
- Source: TCEQ Wastewater Operator Exam Knowledge (Class D table, 'Math Problems' row.)
- What you can bring
- Authorized aids: pen or pencil; proctor-provided monitored scratch paper (collected); a non-programmable calculator. No formula sheet appears in the authorized-aids list.
- Source: TCEQ Computer-Based Testing ('Authorized Aids During Licensing Exams'.)