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The title compound, [Ag(C9H5N2O4)(C9H6N2O4)]·H2O, contains one independent Ag atom, a neutral 1H-benzimidazole-5,6-dicarboxylic acid (bdcH), its monodeprotonated form, i.e. 5-carboxylato-1H-1,3-benzimidazole-6-carboxylic acid (bdc), and one solvent water molecule, the latter being disordered over three sites with site occupancy factors of 0.375 (× 2) and 0.25. In addition, the H atom on one carboxylic acid residue is disordered, being connected to each of the O atoms 50% of the time. The Ag atom is in a virtually linear geometry defined by two N atoms derived from the bdc and bdcH ligands. The three-dimensional supramolecular structure is stablized by extensive O—H...O and N—H...O hydrogen bonds. An intramolecular O—H...O hydrogen bond is also present.