I found this interesting article on Chloramine
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The Chloramine Issue
Most of us are familiar with chlorine. For most of the 20th century, chlorine was the disinfectant of choice for public water supplies. Now it is being rapidly replaced by a substance called chloramine, a mix of chlorine and ammonia. The decline in the use of chlorine began with the relatively recent discovery of a group unsavory and often carcinogenic spin-off chemicals called trihalomethanes (THMs) that are formed when chlorine combines with organic matter in water. To meet EPA standards for THMs, which once created are hard to remove, municipal suppliers are turning increasingly to disinfection with chloramines, which produce much lower levels of trihalomethanes.
As often happens in our imperfect world, however, the solution to the THM problem brought its own set of problems. For example, chloramine can be deadly to fish in aquariums and ponds and to patients on dialysis machines. For regular home use, water with chloramine presents aesthetic issues of bad taste, odor and skin irritation. And let