What happens to the water after you flush the toilet? Join Lila & Andy as they discover the amazing science behind wastewater treatment! Real knowledge for curious minds. When Lila and Andy explore sewage systems with their civil engineer dad, young readers discover the fascinating journey wastewater takes from our drains back to nature. Learn how screening works like giant strainers, why helpful bacteria eat leftover food scraps, and how pump stations push sewage through underground pipe networks. This revised and updated second edition now includes a comprehensive quiz to test understanding, a detailed glossary of wastewater treatment terms, as well as a list of exciting career opportunities, making it even more valuable for educators and curious young minds. In this book you will discover: How wastewater treatment plants use primary and secondary treatment to clean dirty water The step-by-step cleaning process from screening and grit removal to disinfection Why civil engineers design different-sized treatment plants for towns and big cities Different types of wastewater from houses, factories, restaurants, and water parks Real-world applications kids use daily, from flushing toilets to taking showers How cleaned water returns to rivers and lakes as part of the ultimate recycling process This educational adventure combines engaging storytelling with real engineering concepts, making complex wastewater treatment principles accessible for young learners. Perfect introduction to STEM careers in environmental and civil engineering. Perfect for: Young readers curious about where wastewater goes to be cleaned after flushing (ages 8-14) Middle school STEM curriculum support for environmental science and engineering units Homeschool science and technology resources about water cycles and treatment Future engineers who love understanding hidden systems that protect our environment Part of the beloved "Lila and Andy learn" book series, this collection builds scientific literacy one fascinating topic at a time. Preparing tomorrow's engineers today.