Water is getting polluted when we store for drinking
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Many substances that are hazardous to human health can enter water supplies. Chemical waste from factories is sometimes dumped into rivers and lakes, or directly into the ground. Pesticides (chemicals that kill insects) applied to farmland enter surface water and groundwater, often in large quantities. Leaks from underground storage tanks for liquids like gasoline go directly into groundwater. Salt put on icy roads in winter pollutes water also, although it is not as hazardous to health.
Once a pollutant enters a water supply, it is difficult to get rid of it. Some pollutants slowly break down into harmless chemicals. Once the input of pollution is stopped, the pollutant gradually travels downstream and is replaced by unpolluted water. The problem is that it usually takes a long time for pollution to clear up in that way.