Bladder cancer risk increased 33% and colorectal cancer by 15% in using chlorine to disinfect waterChlorinating drinking water at levels common in the United States and European Union probably increases the risk of several cancers, a new analysis of recent research from across the globe finds.The process of disinfecting water with chlorine creates trihalomethane (THM), a byproduct found in virtually all public drinking water systems across the US and EU – nearly 300 million people in the US have concerning levels in their water, by one estimate. Continue reading...
A recent study indicates that chlorination of drinking water, commonly practiced in the US and EU, may elevate the risk of bladder and colorectal cancers due to trihalomethane (THM) byproducts. The research found a 33% increased risk for bladder cancer and a 15% increase for colorectal cancer. While regulatory limits for THMs are set at 80 and 100 parts per billion (ppb) in the US and EU respectively, the study suggests risks begin at 40ppb, a level often exceeded in areas like New York City. The analysis, involving 30 studies and 90,000 participants, noted higher risks among men and focused on bladder and colorectal cancers due to limited data on other types. Surface water tends to have higher THM levels due to more organic matter. Potential solutions include pre-treatment of water, alternative disinfection methods, and home filtration systems like granulated activated carbon, though cost considerations exist. The study recommends continuing to drink municipal water while exploring filtration options.
