Why is water in Bangladesh so polluted?

Nature ought to be taken into account as well. Bangladesh is a flood plain and these habitats ordinarily have semi-aquatic vegetation like mangroves and sea gres. The plants serve both as a natural water purification system and can also protect the land from tidal surges caused by hurricanes and earthquakes. New Orleans was flooded because a lot of the sea gr in the Mississippi delta was removed to allow more ships to dock. In developing countries humans simply remove the vegetation themselves for cooking fuel. This can lead to disasters if wood is stripped from hillsides. Heavy rains can cause mudslides, because there is no vegetation left to hold the soil together. Developers cause the destruction of mangroves by shrimp farming. The area is stripped of vegetation and provides a few seasons of successful harvests. However, without the trees, there is no source of nutrients and the area is soon barren sand. As noted, the final problem is antiquated sewage treatement systems. Natural water filtration systems have been replaced by artificial ones and unlike natural systems, no technology is able to repair itself. If the government can't or won't address this issue, the water will remain polluted.