This book contains 110 water resources and environmental depth questions along with 50 relevant breadth questions, making a total of 160 questions. Each solution is explained in detail, with theory explanations provided when necessary. Solutions are referenced in an easy-to-understand manner. The book earns its name as a Guide in the form of Questions because it takes you on a journey through learning water resources and environmental engineering via well thought out questions. These questions provide nearly full coverage of the required NCEES 2024 exam specifications. Unlike short, straightforward questions, some of the questions in this guide are intentionally longer and more comprehensive. They aim to enhance understanding across all aspects of water resources and environmental engineering, ultimately preparing you to pass the PE exam. Every question in this book is accompanied by detailed figures, serving as visual aids to facilitate understanding. Additionally, step-by-step solutions are provided, along with thorough theory explanations and proper referencing. Lastly, this book offers an alternative to expensive courses and costly resources. It provides a simple yet highly effective method of learning at a fraction of the cost.