sewage water in tap instead of treated water

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The purity of supply water in the metroes is a thing of real concern.I read in newspaper that in some places the sewer water was leaking and as a result sewer water was comming out of taps instead of supply water posing a serious health hazard to the public.I used 20Ltrs jars of packaged drinking water before but they are expensive, so I started using the supply water after filtering it. But now the news has alarmed me so much that I am dreading drinking the water and it not possible for a student like me to invest in packaged drinking water.Pollution is on the rise and I wonder if there is anything that is pure.