Hydrogen is playing a key role in global decarbonization efforts, with Green Hydrogen emerging as a sustainable solution produced through renewable energy-powered electrolysis. The versatility of hydrogen as a fuel or feedstock is driving its adoption in various sectors like transportation, heat, and energy applications. The article highlights the increasing demand for Green Hydrogen production solutions, both from dedicated large-scale producers and businesses opting for in-house production methods. A significant aspect of Green Hydrogen production is the water treatment process. Various water sources, including municipal supplies, surface water, reclaimed wastewater, and seawater, require thorough treatment to meet the quality standards necessary for electrolysis. Technologies like ultrafiltration membranes, reverse osmosis membranes, and electrodeionization play a crucial role in ensuring the purity of make-up water for electrolyzers. The article also discusses different types of water electrolysis technologies available, such as Alkaline Water Electrolysis and Proton Exchange Membranes, highlighting the importance of choosing the right technology based on specific installation requirements. Water quality considerations are key, with factors like conductivity, organic content, silica, and CO2 levels impacting electrolyzer efficiency and longevity. Looking ahead, the International Energy Agency projects a substantial growth in global electrolyzer capacity by 2030, indicating a surge in Green Hydrogen production. This growth trajectory underscores the importance of addressing water supply challenges to support the expanding Green Hydrogen industry and help organizations in achieving their net-zero emission targets by 2050.