Untreated sewage and Problems

It seems that almost every day there is another story about pollution of one form or another, in the food we eat, the water we drink and the air we breathe. Fresh water is a precious resource and the increasing pollution of our rivers and lakes is a cause for alarm, the major cause for river and ground water pollution is found to be the domestic and industrial waste water which is mixed in such sources of water without any treatment. This article is an review of issues related the river pollution, treatment of sewage, and environmental and health problems due to untreated waste water. It also states the necessity of Sewage treatment plant. Some challenges in this field.