Book updated May 2024. Obtaining a water distribution license is not just about fulfilling regulatory requirements; it's about ensuring the safety and sustainability of our water supply. As a licensed water distribution professional, you'll play a crucial role in delivering clean, safe water to communities, protecting public health, and preserving our environment. Preparing for the water distribution license exam can be daunting, but with diligent study and practice, success is within reach. This book is your trusted companion on this journey, providing you with a curated selection of practice questions meticulously crafted to address the technical content of your state's exam. Drinking water systems in Illinois are operated and maintained by certified Drinking Water Operators who are technically competent. The Class D exam has topics that focus on the water distribution system. We create these self-practice water distribution test questions referencing the principles and concepts currently valid in the exam. Each question comes with an answer and a short explanation which aids you in seeking further study information. For purpose of exam readiness drilling, this product includes questions that have varying numbers of choices. Some have 2 while some have 5 or 6. We want to make sure these questions are tough enough to really test your readiness and draw your focus to the weak areas. You should use this product together with other study resources for the best possible exam prep coverage.