This directory includes all 50 states so you can start with your jurisdiction. A listing does not mean every stream or level uses WPI exams or has a dedicated Echelon course. Check the state page's course scope and the authority's current requirements before purchasing.
Water treatment, wastewater treatment, distribution, and collection can follow different certification rules in the same state. Your certifying authority controls eligibility, exam content, permitted references, passing scores, and certification. The authority's current documents control.
The shared WPI course catalogue provides preparation across four streams at Class I to IV. It does not replace state-specific study material or guarantee a match to your exam. Review the selected course's free preview and access details.
Echelon Institute is independent and is not affiliated with or endorsed by ABC, WPI, or any state certifying authority. Certification decisions belong to the authority, not Echelon.
Return to the US overview or review Individual Exam Pass terms and Canadian dollar (CAD) pricing.