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There are several of water getting dirty.Some are as follows-

1.Throwing of wastes into water bodies.

2.Oil spills from ship make water dirty.

3.Over extraction of ground-water leads to contamination of groundwater as well as lowering of water table.

4.Harmful toxic chemical wastes from industries and factories when discharged into water,makes it dirty.

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A common cause of dirty water includes the dumping of waste and sewage into water supplies. The practice of open defecation that seeps into water supplies is also a common factor of dirty and unsafe water.