Study Guide

Study materials to help you succeed.

WPI works with AWWA and WEF to develop guides to help operators prepare for taking a certification exam. These guides are available for purchase from:

Water Treatment and Distribution Operators

• American Water Works Association Bookstore
  Phone (800) 926-7337
  • WSO Water Treatment, Grade 1
  • WSO Water Treatment, Grade 2
  • WSO Water Treatment, Grades 3 & 4
  • WSO Water Distribution, Grades 1 & 2
  • WSO Water Distribution, Grades 3 & 4
  • Water Operator Certification Exam Prep Book
  • Water Operator Certification Exam Prep App

Wastewater Treatment, Collection, and Wastewater Lab

• Water Environment Federation Bookstore
  Phone (800) 666-0206

• WEF/WPI/C₂EP Wastewater Operators’ Guide to Preparing for the Certification Examination
• WEF/WPI/C₂EP Collection Systems Operators’ Guide to Preparing for the Certification Examination
• WEF/WPI Wastewater Laboratory Analysts’ Guide to Preparing for the Certification Examination
• WEF/WPI Wastewater Treatment Fundamentals l – Liquid Treatment Guide to Preparing for the Certification Examination

Wastewater and Laboratory practice questions developed by WEF are available in the Skills Builder section of WEF’s website.

Very Small Water Systems Operators

• The Very Small Water System Operators’ Guidebook to Preparing for Certification relates to the critical knowledge required to competently operate water systems.
• Very Small Water Systems web-based practice exam

Biosolids Land Applier Operators

• Water Environment Federation Bookstore
  Phone (800) 666-0206
• WEF/WPI Biosolids Land Appliers’ Guide to Preparing for the Certification Examination