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In the title compound, C 6 H 6 N 2 O 4 ·H 2 O, one carboxyl group is deprotonated and one imidazole N atom is protonated. The organic mol­ecule, excluding methyl H atoms, is essentially planar, with an r.m.s. deviation of 0.0156 (1) Å. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds link mol­ecules into chains along the  b  axis; these chains are further linked  via  O—H⋯O hydrogen bonds involving the water O atoms and carboxyl O atoms, generating a two-dimensional supra­molecular framework.

4-Carboxy-2-methyl-1H-imidazol-3-ium-5-carboxylate monohydrate