Trihalomethanes (THMs)

THMs, the most common byproducts formed when water is disinfected, are comprised of four compounds: chloroform, bromodichloromethane, dibromochloromethane and bromoform. Numerous studies have shown that although drinking water is a major exposure route for THMs, showering and bathing are important routes through inhalation and dermal absorption. High concentrations of THMs have been associated with varying degrees of birth defects. To decrease exposure to THMs, consumers should consider buying water filtration systems.