A new study published in Environmental Health Perspectives highlights a concerning link between chlorinated tap water and cancer. While chlorine is essential for disinfecting water, it can react with organic matter to form trihalomethanes (THMs), known carcinogens. Although THMs are regulated in the U.S. and Europe, many Americans consume water with levels exceeding safe limits. The study suggests that cancer risks begin at just 40 ppb, far below current legal limits. Experts stress that chlorination remains vital for preventing waterborne diseases, but individuals can reduce exposure by using carbon filters, reverse osmosis systems, or boiling water.