This book contains 4 full-length practice exams for water treatment certification. Each practice exam consists of 100 questions, which test the operator's knowledge of water treatment concepts and ability to solve relevant math problems. The 400 common test questions contained in this book are based on actual exams. The questions cover the following topics: 1. Water source 2. Reservoirs and intakes 3. Coagulation and flocculation 4. Sedimentation 5. Filtration 6. Disinfection 7. Corrosion 8. Taste and odor 9. Plant operations 10. Lab procedures 11. Safety 12. Drinking water regulations 13. Pumps . The book is geared towards those who are in the earlier stages of their career, such as the first two certification levels.