Pass your operator exam without giving up your evenings
Four sections — Water Treatment, Wastewater Treatment, Water Distribution, and Wastewater Collections — turned into short, phone-friendly practice sessions with real questions and explanations, water math with worked solutions, and timed practice exams.
Everything is 100% free — every course, every question, every practice exam. No card, ever.
Choose your section
Every lesson, question bank, math drill, and practice exam lives in one of four sections.
Water Treatment
Coagulation, filtration, disinfection, chemical feed, and treatment plant math for surface and groundwater plants.
1 course
Wastewater Treatment
Preliminary treatment, activated sludge, clarifiers, digesters, lab work, and discharge permit compliance.
2 courses
Water Distribution
Mains, valves and hydrants, storage and pressure, chlorination in the distribution system, sampling, and cross-connection control.
2 courses
Wastewater Collections
Gravity sewers and manholes, lift stations and force mains, cleaning and inspection, I&I, odor control, and overflow response.
1 course
Everything the exam asks of you
Diagnostic first
A short mixed quiz scores every topic, then hands you a study order starting with your weakest weighted areas.
Practice that adapts
Filter by topic, drill only what you missed, and switch between study mode explanations and exam-like test mode.
Math you can actually do
Dosage, detention time, pipe volume, flow and velocity, pressure and head — new numbers every attempt with worked steps.
Real exam conditions
Full-length timed exams weighted like the blueprint, with a countdown, auto-submit, and a scored review.
Built for crews
Department managers track readiness across the team, assign courses, and export training records to CSV.
Ten minutes at a time
Sessions are short and thumb-friendly, so studying fits between service calls instead of needing a free evening.
Featured course
Entry-Level Water Treatment
Entry-level surface and groundwater treatment prep for drinking water operators.
0 practice questions across 7 weighted topics, plus a 90-minute 50-question practice exam.
Take the diagnostic
Fifteen minutes tells you which weighted topics are costing you the most points.
Work the plan
Practice by topic in study mode, drill the math, and clear your missed questions.
Prove it under time
Sit a full timed practice exam. When your readiness score holds above the passing line, book the real one.
Training a whole crew? Also free.
Add your whole department at no cost, assign courses, track readiness, and export progress for your training records.