This updated study guide follows the new requirements established by the ABC. It is organized by certification levels I, II, III, and IV. Questions are ranked f
Pass your wastewater certification exam the first time! This study guide is specially developed to give wastewater operators practice answering questions that a
This book is a revision of the popular study guide for water system last published in 1993. This study resource is a practical tool for treatment plant operator
This book contains 4 full-length practice exams for water treatment certification. Each practice exam consists of 100 questions, which test the operator's knowl