In a new study coming out of Barcelona, data shows that chlorinated water can increase the risk for bladder cancer. Not only drinking it, but also bathing and swimming in it was shown to be enough exposure. The cancer risk comes from by-products (called TMH) produced by the chlorine that are ingested, inhaled, or absorbed into the body. The risk is greatest from showering and swimming in chlorinated water, with a smaller risk (but there nonetheless) from drinking it. Researchers believe that absorbing the by-products through the skin or lungs is more toxic because then they aren't processed and detoxified through the liver.

This is concerning because chlorine is everywhere, and now I'm wondering what the TMH levels are in my city's water.