A water audit (domestic/household),similar to an energy audit, is the method of quantifying all flow of water in a system to understand its usage, reduce losses and improve water use efficiency. It can be performed on a large scale for a city or a state as well as on a smaller scale for irrigation projects, industries and buildings. The audit can begin with an extensive approach to generate the water balance using available data and estimates which helps in identifying specific areas to concentrate in a further stage. Greenfield Eco Solutions has conducted water audits at Birla White, Hindustan Copper Limited and Hindustan Zinc Limited from 2018 onwards. The audits have resulted in checking water wastage and putting it to optimum usage.