Chlorine

Regulatory bodies such as the CDC classify tap water chlorine levels as safe, but this does not mean there is no biological impact over long-term multi-route exposure. Chlorine is acutely toxic to fish, illustrating its significant biological activity. Chlorine in tap water is not biologically inert once it enters the body. Chlorine is a highly reactive halogen that can damage skin and hair with regular shower water exposure. Chlorine in shower water can contribute to acne-type skin issues. Documented health concerns from chlorine exposure include lung problems, increased bladder cancer risk, and immune system suppression.