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Toxic Pollution in Water Agriculture, mining, oil drilling, and many other industries dump chemical wastes into water sources. This makes the water unsafe to drink or to use for preparing food, for bathing, or for irrigation. In some places, water may be contaminated by toxics that naturally exist in the earth, such as arsenic and fluoride (a natural substance that causes brown spots on teeth and severe bone weakness). As the groundwater is used up, the risk of natural toxics grows because they are concentrated in the water that is left. Whether they are from industry or from the earth itself, toxic chemicals are usually invisible and difficult to detect. Testing water in a laboratory, possibly at a university, can help detect both natural toxics and chemicals from 6 hours of collecting it