Texas, TCEQ, Water System Operator, Class D
Free Texas Class D Water Math Practice
Last reviewed 2026-08-01. Facts link to their official source.
3 free practice modules cover the Class D math on the Texas Class D water operator exam that TCEQ confirms at this grade: unit conversions, chlorine dosage, and tank volumes. Every problem uses fresh numbers, shows all ten worked steps, and saves your progress on this device.
Pick a module
- Unit ConversionsYou practice gallons to cubic feet, MGD to gpm, psi to feet of head, and percent to mg/L.2 problem shapes
- Chlorine DosageYou practice dose, demand, and residual, the three-way relationship behind every chlorination question.3 problem shapes
- Tank VolumesYou practice rectangle and round tank volumes ending in gallons, plus the circle areas loading questions need.3 problem shapes
Where these modules fit in the official exam
- The official subject list this module serves
- Eight official Need-to-Know subjects: Rules/Regulations; Safety; General; Groundwater; Surface Water; Storage/Distribution; Disinfection; Math.
- Source: TCEQ Water Operator Exam Knowledge ('Need-to-Know Criteria for Class D Water Operators' table.)
- The official math scope
- Class D math: use common conversion units from a table of equivalents; solve basic water utility problems using area, volume, and chemical dosage formulas.
- Source: TCEQ Water Operator Exam Knowledge (Class D criteria, 'Math' row (detention time first appears in the Class C criteria).)