A study by researchers from the Karolinska Institutet in Sweden analyzed data on trihalomethanes (THMs), chemicals linked to cancer, in drinking water across North America, Taiwan, and Europe. The results show that levels of THMs are dangerously high in all 50 US states, with a significant increase in bladder and colorectal cancer risks.
Researchers found that THM levels above 41 ppb were associated with a 33% higher risk of bladder cancer and a 15% higher risk of colorectal cancer. The study also revealed that people within the highest category of exposure had an increased risk of bladder cancer, with a 26% higher risk compared to those in the lowest exposure group.
THMs are produced when chlorine comes into contact with raw organic materials such as decaying plants, and can be harmful if consumed or inhaled. While some cities have levels of THMs below the maximum safe level of 0.15 ppb, many others exceed this threshold, including major cities like New York City (42 ppb), Los Angeles (28.3 ppb), and Chicago (29.8 ppb).
Experts warn that exposure to high concentrations of THMs over long periods poses the greatest health risk. Activated carbon and reverse osmosis filters can remove THMs from tap water, but scientists caution against relying on bottled water as a safer alternative.
The growing concern about tap water safety has prompted Health and Human Services Secretary Robert F Kennedy Jr to make bolstering water safety a core aim of his Make America Health Again initiative. However, experts disagree with his claims that fluoride in the water supply is associated with health problems, citing evidence that fluoridated water has prevented millions of cavities and saved billions of dollars in dental costs.
Source: https://www.dailymail.co.uk/health/article-14409755/scientists-issue-warning-tap-water-chemical-cancer.html