In enterprises that produce a lot of chromium wastewater that cause harmful effect to the environment and human health. This research aims to pay expressively to the field by proposing a unique and effective solution to the ongoing experiment of chromium contamination in water and wastewater employing CaCO3 Nanocomposite hydrogels. The hydrogel’s fundamental changes have been characterized using techniques such as FTIR, XRD, TGA and SEM. Batch experiments systematically investigated key parameters, including contact time (60–360 min), initial ion concentration (50–500 ppm), pH (2–6), and adsorbent dose (0.1–0.5 g). Results showcased an impressive 96 % efficiency in chromium ion removal. Analysis utilizing Langmuir (R2 = 0.9382) and Freundlich (R2 = 0.9986) isotherm models, alongside pseudo-first (R2 = 0.9487) and pseudo-second-order (R2 = 0.9999) kinetics studies, revealed insightful patterns. Our findings demonstrate a favorable fit with the Freundlich isotherm, suggesting a strong attraction between the adsorbent and the metal ions. Additionally, kinetic studies indicate that the adsorption process adheres to pseudo-second-order kinetics. These results collectively suggest that the prepared hydrogel presents a viable and sustainable option for wastewater treatment, particularly in areas where conventional treatment methods may not be feasible due to cost or a lack of infrastructure.