The contamination of water bodies with metallic ions has become a critical eco and health issue, over the past few decades. It is primary causes of this contamination are industrial processes such as mining, electroplating, and waste disposal. These activities result in the augmentation of hazardous metals such as lead (Pb), copper (Cu), chromium (Cr), and cadmium (Cd) in groundwater systems. They pose serious health risks, including neurological damage, liver and kidney dysfunction, and more. The following chapter is going to discuss the application of carrageenan and dextran-based bionanohybrids for metallic ion abatement and its solution using adsorption techniques taking natural biopolymers, i.e., dextran and carrageenan. A combination of these biopolymers with nanomaterials results in the formation of bionanohybrids. Thus, they provide an eco-friendly, efficient, and sustainable solution to metallic abatement. They enable a sustainable and effective route toward the reduction of metallic contamination. High efficiencies of adsorption, together with their reusability, make them very competitive regarding the traditional methods available up to now. However, some effort remains to be made in the fields of optimization of production, improvement of environmental stability, and scale-up for industrial applications. It also points out the remaining work required to unlock the full potential of those innovative materials at renewal in applications related to environmental remediation.