As the world moves towards cleaner energy sources, hydrogen is increasingly recognized as a vital component of the green energy revolution, particularly in sectors that are hard to electrify like heavy industry and transportation. However, the significant water requirements for hydrogen production through electrolysis pose a challenge amidst growing water scarcity. A solution lies in utilizing treated final effluent (TFE) – the treated waste water discharged from treatment plants. Unlike natural water sources, TFE offers a sustainable and reliable alternative that maintains a consistent high standard, simplifying electrolysis pre-treatment processes. This approach reduces operational costs and risks for hydrogen producers. Reusing TFE not only conserves freshwater resources but also supports a circular economy by repurposing waste for a valuable purpose. Moreover, co-locating hydrogen production facilities with waste water treatment plants optimizes infrastructure, reduces costs, and fosters resource efficiency. Embracing TFE for hydrogen production demonstrates a commitment to sustainable water use, building public trust. This innovative approach aligns industrial growth with environmental responsibility, showcasing the potential for a sustainable hydrogen economy that benefits both industry and society.