WPI (Water Professionals International) is Echelon Institute's interactive reference guide for Canadian water and wastewater operators. It covers the full treatment process from source water intake to distribution, as well as wastewater collection and treatment systems.
WPI includes detailed explanations of coagulation and flocculation, sedimentation, filtration, disinfection (chlorination, UV, ozone), chemical feed and dosing, iron and manganese removal, water quality regulations, pump operation, and more. Wastewater content covers primary and secondary treatment, biological processes, sludge handling, and collection system maintenance.
Echelon's Western Canadian courses follow WPI-aligned operator topics. Certification rules remain province-specific; candidates should confirm the current exam blueprint, eligibility, and permitted references with EOCP or the applicable provincial authority.
WPI is designed to complement Echelon's practice question bank. When you encounter a topic you are unsure about in a practice question, WPI provides the conceptual background and regulatory context to help you understand the correct answer. Start practising or view Individual Exam Passes.