Water operator study notes

High-yield notes for the Texas Class D exam, on clean one-page sheets styled to look handwritten, so the constants, formulas, and key ideas are easy to skim and easy to remember. Free, and you can print any of them or save as a PDF.

• Water & wastewaterOperator mathOne-page operator math notes for the Texas Class D exam. The constants and formulas you reach for most: volume in gallons, the pounds formula for dosage, flow conversions, detention time, and pressure from head. Everything here matches our sourced formula reference.Open the notes
• Water & wastewaterDisinfectionOne-page disinfection notes for the Texas Class D exam. The chlorine ideas operators mix up most: dose vs demand vs residual, free vs combined vs total chlorine, and why contact time and a lasting residual matter.Open the notes
• WaterDistributionOne-page water distribution notes for the Texas Class D exam. The system that carries treated water to customers: components and valves, pressure and storage, cross-connection control, and the pipe-volume math.Open the notes
• WastewaterWastewater treatmentOne-page wastewater treatment notes for the Texas Class D exam. How a plant lowers the load: BOD and TSS, the primary and secondary stages, activated sludge (RAS vs WAS), and the detention and loading math.Open the notes