This document discusses sustainability challenges and solutions for tannery clusters in India. It outlines an Integrated Management System model to help tanneries meet environmental standards. Key challenges include adhering to regulations on wastewater quality. The document then details opportunities to reduce water consumption in tannery operations from 50 liters per square foot to 30 liters. It provides examples of effluent management practices such as establishing a zero liquid discharge process involving conventional treatment, reverse osmosis, and evaporation to treat and recycle all wastewater. Finally, the document describes the process used at a common effluent treatment plant to treat tannery wastewater before reuse.