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

This book offers 1,400 plus practice questions and answers so that you can take your water operator certification exam with confidence.

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 contains 4 full-length practice exams for water treatment certification. Each practice exam consists of 100 questions, which test the operator's knowl