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Catalytic reactivity performance is a significant challenge for catalytic wet peroxide oxidation (CWPO) technologies. Copper-impregnated eggshells (x%Cu@ES) were tested as a potential new low-cost catalyst to improve the CWPO process for the toxic dyes Congo Red (CR) and Crystal Violet (CV). The structure, morphology, and chemical composition of the x%Cu@ES catalyst were analyzed using FTIR, XRD, and SEM-EDX. Oxidative degradation of both dyes is enhanced by the presence of x%Cu@ES, which generates hydroxyl radicals in the reaction medium after contact with hydrogen peroxide. Decolorization rates according to the Box Behnken design are in the order of 99.88 % and 99.99 % for CR and CV respectively under the optimum conditions of 1 % copper content, 0.074 M H₂O₂ concentration, 60 mg L⁻¹ dye concentration, and 2 g L⁻¹ catalyst dose. After several regeneration cycles, the catalytic …