This book chapter presents a comprehensive exploration of transformative approaches to address the global challenge of water treatment and sanitation. This chapter begins by elucidating the “Fundamentals of Biotechnological Applications in Water Treatment,” unravelling key concepts and the pivotal roles of microorganisms and enzymes. Comparative analyses with traditional methods set the stage for a thorough examination of biotechnological solutions. Navigating through “Bioremediation Techniques,” this chapter dissects conventional and advanced methodologies, showcasing the versatility of tools such as activated carbon, membrane bioreactors, and enzyme-based treatments. The focus broadens to “Industrial Water Treatment,” exploring applications, challenges, and successful case studies, seamlessly transitioning to “Advanced Water Sanitation System Technologies,” where solar-powered filtration, desalination, nanotechnology, and more emerge as innovative pillars. Addressing societal impacts and public perception, this chapter delves into awareness, cultural considerations, and ethical implications. “Policy and Regulatory Frameworks” scrutinizes current regulations and the necessity of international collaboration. Community engagement and education emphasize the importance of grassroots involvement and education, while economic viability reflects cost-effectiveness, benefits, and investment opportunities. Through this interdisciplinary lens, the chapter weaves a narrative that transcends technological boundaries, envisioning a future where biotechnological innovations redefine water treatment and foster sustainability, accessibility, and community engagement on a global scale.