Besides experiments with laboratory animals (rats and mice) there are also epidemical studies on effects of exposure of humans to disinfection byproducts in drinking water. At first the relation of death because of cancer and the use of chlorinated or non-chlorinated drinking water were investigated.
Subsequently studies showed that chlorinated drinking water increases the risk on bladder and anal cancer. The risk did not decrease when other factors, smoking, residence and work were investigated as well. The risk of intestinal cancer was not significant, but increased at higher concentrations disinfection byproducts. (Morris , 1992)





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