It is a matter of quality and scarcity. Over 97 percent of the people in Bangladesh already have access to water, but the problem lies on sanitation and adequacy.
According to the WHO, of the 97 percent, only 40 percent are provided with clean potable drinking water while an astounding of nearly 60 percent have to put up with unsanitary and harmful water.
The availability of clean water rises and falls with irregularity all throughout the year depending on the seasons. For example, the warmer season, coupled with the onslaught of monsoons, brings massive amounts of water while cooler drier season brings a drought.
Bangladesh infrastructure is to partly to blame as it is unable to handle the deluge of water brought by torrential rains during the monsoon season. The water that is available during the dry season mostly used for irrigation.
The major river systems such as Brahmaputra, Meghna, and Ganges all emanated mostly from China and India. Due to the population booms from both countries, the amount of water that gets to Bangladesh through these river systems become immensely inadequate for the population.
Therefore Bengalis have little or no control over the amount of water being supplied to them from these sources. Aside from the lack of infrastructure, it's also a matter of geography.
In addition to the problem, there has been recorded a rise in the water's salinity due to the construction of the Farraka Barrage located in India that diverts the water supplied by the Ganges for the irrigation of Indian crops.
