The chloronitramide anion, also known as chloro(nitro)azanide, is a recently (2024) identified chemical byproduct of the disinfectant chloramine.

[1][2][3] It is present in the tap water of about 113 million people in the United States of America in varying concentrations.

[7] In the 1980s and 1990s methods of producing it in high concentrations were identified, and the molecule was shown through destruction to contain both nitrogen and chlorine.

[1][6] Ion chromatography, a method of separating ions and ionizable polar molecules, was used to separate the chloronitramide anion from the many salts present in water samples containing it, which otherwise made it difficult to use mass spectrometry; the water salinity was higher than that of saltwater.[1][why?]

[6][9] Research investigating the toxicity of the chloronitramide anion, as well as the reasons for its formation in high or low concentration in different places, is expected.