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One in five Americans drink water disinfected with chloramine, a technology that has been in use since the early decades of the 20th century. Chloramine is produced at water treatment plants by combining chlorine and ammonia. Cities that treat water with chloramine include Denver (since 1918), Portland (since 1929) and Boston (since the 1930s), among
The chloramines -- monochloramine (NH2Cl), dichloramine (NHCl2) and nitrogen trichloride (NCl3) -- form when chlorine and ammonia are combined in water. Traditionally, treated wastewater, which contains ammonia, is disinfected by the addition of chlorine.