Texas · TCEQ · Class D Water
Texas Class D water operator mock exam
A Texas Class D water operator mock exam runs at the real limits: three hours and 70 percent to pass, drawn from the reviewed question bank and scored by subject. It is a full-length practice run, closed-book like the real thing, so you see where you stand. It is honest practice, and never a promise about your result.
Last reviewed 2026-08-01. Facts link to their official source.
The facts that shape your prep
- Time limit
- Three-hour time limit.
- Source: TCEQ Computer-Based Testing ('All exams have a 3 hour time limit unless otherwise noted'; Class A exams are the noted six-hour exception.)
- 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'.)