Water Distribution Grade 3 and 4 Operator Study Guide is an independent educational publication and is not affiliated with, endorsed by, or sponsored by the Association of Boards of Certification, any state or provincial licensing board, or any water utility organization referenced in this guide. All product names, certification titles, agency names, and trademarks mentioned throughout this book, including any references to ABC Need-to-Know Criteria, AWWA standards, or state environmental agencies, are the property of their respective owners and are used solely for identification and educational purposes. Reference to any specific certification exam, standard, or trademarked term does not imply endorsement of this publication by the trademark holder.
