Texas Wastewater Operator Class D Exam Prep

Current Status

500 original practice questions across 13 practice areas, organized on the subject list TCEQ publishes in its Need-to-Know guidance for Class D wastewater operators — a single license with a single examination and no specialty split, at the entry tier of the treatment ladder.
Practice for a computer-based exam: the full practice exam runs 180 minutes on its clock, mirroring the real exam’s published 3-hour limit.
A free 12-question sample exam with a fixed set, so you can gauge the style before you buy.
A full 100-question practice exam (180-minute clock) drawing fresh questions on every attempt — the 100-question draw is this program’s own practice format.
Calculation items throughout — 60 across the bank, all in the Math area — volumes, detention time, chemical feed, chlorine demand, loading rates, and sludge indices worked from standard conversion constants.
Our practice exam is scored against a 70% practice benchmark, set to mirror the 70% minimum passing score TCEQ’s general examination rule sets for an examination. PRACTICE BENCHMARK ONLY — your score here is a study signal, not a result on the real exam.

A drill for each of the 13 topics:

Lesson Content