How do toxins contribute to water pollution?

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.

Explanation:

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 industry. If possible, try to get the water to the laboratory within 6 hours of collecting it.