3-EPA
Unrt* <•'-, ,.
, ' * *
Chlorination first beganlntheeariy 1900s-
As a result, diseases tuchw cholera and
typhoid have been nearly eliminated.
In 1974, diloftrfdnn was found to occur in
water following tWorinatioru Additional
byproducts have linoe been identified as
byproducts of the reaction between chlorine
and organic material found in water.
Chlorofojin^atrihaloniethaneCrHMs^isan
animal carcinogen. Some of the other by-
products have abo been shown to cause
cancer or other advene health effects in
EPA ertablished a relation In 1979 that
limited the amount of THMsto 0.1 mg/L for
water supplies serving 10^00 people or
more »• " -
In the 1980§, several epidemiology studies
rejected an increased risk of Uaddery colon
and rectal cancer ** Individuals drinking
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