News about contaminants problems comes from U.S. Environmental Protection Agency, the government group that sets the drinking water standards. For example lead is so important that EPA changed they original standards to allow less lead in water. It is clear that lead is a serious problem.
According to statistics, as many as 30 million people in USA may be drinking water containing unhealthy levels of lead.
EPA study reveal that Cryptosporidium is found in surface waters in many  locations within USA.
Microscopic crypto egg cysts, which are not killed by chlorine disinfectant, run off into drinking water supplies from livestock farms and wild animal feces.
There's no cure for the intestinal parasite, which runs its course over two weeks.   Because crypto illness mimics food poisoning or severe flu, Centers for Disease Control believes the infection is widespread but goes unreported. Crypto is only reduced by very fine filters, which can block cysts that are smaller than a blood cell.

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