Consider a glass of plain tap water: it’s cool and refreshing. Although it appears to be pure and healthy, it is likely to contain significant levels of haloacetic acids and other hazardous pollutants.
Haloacetic acids (haa) are “chemical compounds containing chlorine and bromine,” according to their description. They arise when chlorine used to clean drinking water combines with organic materials found naturally in the water.
Long-term exposure to high quantities of haloacetic acids has been associated to a variety of health problems, including cancer, birth abnormalities, and skin irritations.