Featured Application This preliminary research demonstrates the potential of a toxic and hazardous mining residue to adsorb As(V) and Cr(III) from contaminated waters. The next step could be the incorporation of this waste (industrial jarosite) into a porous concrete (ACC) and perhaps successfully increasing its adsorption capacity. This innovative approach offers a promising solution for the removal of toxic heavy metals from polluted water sources, providing a potential application in water treatment and remediation technologies.Abstract The global problem of water scarcity is exacerbated by the continued contamination of potable water sources. This preliminary study investigates the potential of a hazardous industrial jarosite waste to adsorb As(V) and Cr(III) from contaminated waters. The results showed that this mining waste effectively adsorbed both As(V) and Cr(III), demonstrating its potential as a low-cost and sustainable solution for water remediation along with the use of a hazardous waste that also contaminates. The adsorption process was optimized, and the effects of various parameters on the adsorption capacity were investigated. The findings of this study suggest that the use of toxic mining residues in porous concrete could provide a promising approach for the removal of toxic heavy metals from polluted water sources, contributing to the development of more sustainable and environmentally friendly water treatment technologies. A maximum adsorption of 90.6% of As(V) and 96.3% of Cr(III) was achieved, and it was verified that the industrial jarosite initially contained about 0.44% As, which was later leached during decomposition; again, the industrial jarosite was able to re-adsorb both As(V) and Cr(III).