Examination Resources

Study materials to help you succeed

As you prepare for your certification exam, you may wish to utilize the following WPI resources:

Need-to-Know Criteria

The Need-to-Know Criteria describe the core competencies covered on the standardized exams.  The Criteria also list exam specifications and reference material that should be used to prepare for the ABC exam.

Formula/Conversion Tables

Formula/Conversion Tables are provided during the examination to assist with exam calculations.

Exam References

You can view a list of the reference sources for the current standardized exams and link to the publishers’ sites for more information.

Study Guides

WPI works with American Water Works Association (AWWA) and Water Environment Federation (WEF) to develop study guides to help you get ready for your certification exam. Guides are available for purchase through WEF and AWWA.

Sample Exam Questions

Get a feel for the exam with these sample questions. While you will not find questions directly from an exam that do not necessarily represent current exam content, they will help you familiarize yourself with a certification exam format.

Web-Based Testing Demo

Choose any “Online Exam Format” sample questions to try out the web-based testing interface.

Computer-Based Testing Overview

Access a brief video to learn what to expect when you take a computer-based exam at a PSI Test Center.

Upcoming Events

WPI will be hosting a POWER event in San Antonio, Texas June June 13th at AWWA’s ACE22 where we will be honoring the most recent PO Certifications in a pinning ceremony.  Contact us if you would like us to honor YOU.