Equitable billing of Water Expenses

In housing societies in India, water expense is not metered and charged at an individual flat level. Water usage and the related expenses are equally divided among the number of flats irrespective of actual usage. However, number of residents in a flat and their water usage vary greatly. Some flats have only one or two residents, but others may have six or more of multiple generations. Even in flats with the same number of residents, the water usage varies. Some are very concerned about the conservation of water and are used to not wasting water as a habit. Others may not be bothered or even aware of the issue at all.