Answered
Is there math on the Texas Class D water exam?
Yes, but not much and not hard. The Class D water exam includes basic operator math: unit conversions, tank volume, flow, and simple chlorine dosage, using constants like 7.48, 8.34, and 0.785. A non-programmable calculator is allowed, and most questions are operational knowledge rather than math.
Last reviewed 2026-08-03
What the math covers
Expect volume of a tank, conversions between gallons and cubic feet, flow rates, and a straightforward chlorine dose. The numbers are clean and the formulas are few; the trick is knowing which formula to use.
How to prepare for it
Drill the handful of formulas and constants until you can set them up without thinking, and practice with a non-programmable calculator like the one you will use on exam day. Our 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 constants come up?
- 7.48 gallons per cubic foot, 8.34 pounds per gallon, and 0.785 for circles.