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In the title hydrated salt, C15H11Br2N2+·Cl·2H2O, the complete imidazolium cation is generated by a crystallographic twofold axis, with one C atom lying on the axis. The chloride ion and both water mol­ecules of crystallization also lie on a crystallographic twofold axis of symmetry. The cation is non-planar, the dihedral angle formed between the central imidazolium and benzene rings being 12.9 (3)°; the dihedral angle between the symmetry-related benzene rings is 25.60 (13)°. In the crystal, O—H...Cl hydrogen bonds result in supra­molecular chains along c mediated by eight-membered {...HOH...Cl}2 synthons. These are consolidated by C—H...O and π–π [centroid–centroid distance = 3.687 (3) Å] inter­actions.

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The title mol­ecule, C12H11N3O4, is essentially planar, the r.m.s. deviation for all non-H atoms being 0.068 Å. An intra­molecular C—H...N hydrogen bond occurs. The crystal packing is dominated by π–π inter­actions [shortest centroid–centroid distance = 3.6312 (16) Å], which lead to supra­molecular chains that are linked into a three-dimensional network via C—H...O contacts. The crystal was found to be a non-merohedral twin (twin law −1 0 0/0 −1 0/ 0.784 0 1), the fractional contribution of the minor component being approx­imately 22%.
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