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Pollution of fresh water — getting various pollutants in the water of rivers, lakes and groundwater. Occurs by direct or indirect contact with contaminants in the water, in the absence of adequate measures for the treatment and disposal of hazardous substances.In most cases, contamination of fresh water remains invisible because contaminants are dissolved in water. But there are exceptions: foaming cleansers are also floating on the surface of oil and raw sewage. There are several natural pollutants. Are in the land of aluminum compounds get into the fresh water system as a result of chemical reactions. The floods washed out of the soil of grassland magnesium compounds which cause great damage to fish stocks.