Echelon Institute offers 16 certification prep courses covering all four ABC/WPI streams and all four class levels. Each course includes 500+ practice questions, a 100-question timed mock exam, and organized flashcards aligned to the 2025 WPI Need-to-Know Criteria.
Water treatment operator courses cover coagulation, flocculation, sedimentation, filtration, disinfection, chemical feed, source water quality, and regulatory compliance. Start with Class I Water Treatment.
Wastewater treatment courses cover primary, secondary, and tertiary treatment, activated sludge, nutrient removal, biosolids management, laboratory analysis, and equipment operation. Start with Class I Wastewater Treatment.
Distribution system courses cover pipe materials, pressure zones, cross-connection control, water quality monitoring, hydrant maintenance, and system hydraulics. Start with Class I Water Distribution.
Collection system courses cover gravity sewers, force mains, lift stations, infiltration and inflow, CCTV inspection, cleaning equipment, and confined space safety. Start with Class I Wastewater Collection.
The first 15 questions on every course are free — no account or credit card required. View pricing for full access.