Geomembrane materials, including EPDM (Ethylene Propylene Diene Monomer), Linear Low-Density Polyethylene (LLDPE), High-Density Polyethylene (HDPE), Polyvinyl Chloride (PVC), and Polypropylene (PP), are revolutionizing the way we protect our environment. These synthetic polymers act as robust barriers to prevent the mix of liquids in landfill sites, ponds, and other critical areas, underscoring their pivotal role in environmental conservation and engineering projects. Delving into the composition, which spans from the highly flexible EPDM, known for its weather resistance, to the sturdy and chemically resistant HDPE and LLDPE, this article provides insights into why these materials are considered an indispensable part of modern environmental and engineering solutions. Additionally, the inclusion of PVC and PP expands the versatility of geomembranes, catering to a wide range of applications due to their distinct properties, such as PVC’s affordability and PP’s fatigue resistance.