4 ppm MCL , and the MCLG was reached . The same with other contaminants .
Pills consumed by us for medical needs end up in our waters .
When I ask for more recent contaminants , Mr . O ’ Brien mention one known as “ Endocrine Disruptors ”. This contaminant has been found in surface water systems ( such as lakes and rivers ). This contaminant originates from medicine that is made by us for medical purposes . They are consumed by us , put into the sewers , flow down into a river or lake , and in to a water treatment plant . There , people try to treat as a normal contaminant . But an aspect of endocrine disruptors is that they are very , very hard to get rid of . Water may even have to be treated twice to make in safe for people to drink . Another is called PFOA . Surprisingly , this is found in groundwater rather than surface water . It originates from the product Teflon . When it is thrown out , sits in the earth so the chemical seep in to the ground water . There it is pulled out by wells . Like Endocrine Disruptors , it is also hard to get rid of . The effects of these contaminants can cause neurological disorders , cancer , and , if too much is consumed , even death . In the wild , mutations are caused by these chemicals . Fish are born with both male and female sex organs . Frog are born with 3 or 4 hind legs .
deadly chemicals made by us .
This frog was mutated by the effects of new