Answered
Is there math on the Texas Class D wastewater exam?
Yes, some. The Class D wastewater exam includes basic operator math: flow conversions, detention time, chemical dosage, and simple loading rates, using constants like 7.48, 8.34, and 0.785. A non-programmable calculator is allowed, and most of the exam is operational knowledge rather than math.
Last reviewed 2026-08-03
What the math covers
Expect flow conversions between GPM, GPD, and MGD, detention time in a tank, a straightforward chemical dose, and basic hydraulic or filter loading. The formulas are few and the constants are the same ones water operators use.
How to prepare
Drill the handful of formulas until setup is automatic, with a non-programmable calculator like the one you will use on exam day. Our formula reference lists them all, and the free calculators show every step.
Common questions
- Can I use a calculator?
- Yes, a non-programmable one.
- Is the exam mostly math?
- No. Most of it is operational knowledge.
- What math shows up?
- Flow, detention time, dosage, and simple loading rates.