Using chloramine to disinfect drinking water is a common standard practice among drinking water utilities. A number of utilities, including Las Virgenes Municipal Water District, have made this switch from chlorine to chloramines to enhance water safety and compliance with drinking water health standards.
Chloramines, like chlorine, are toxic to fish and amphibians at levels used for drinking water. Unlike chlorine, chloramines do not rapidly dissipate on standing. Neither do they dissipate by boiling. Fish owners must neutralize or remove chloramines from water used in aquariums or ponds. Treatment products are readily available at aquarium supply stores.