Two chiral centres exist in the title compound, C(12)H(12)N(4)O(3)·H(2)O. Mol-ecules are linked into chains by series of inter-molecular N-H⋯O and O-H⋯N hydrogen bonds, which causes supra-molecular aggregation. Two chiral centres are formed in the title compound. The indole and creatinine moieties make a dihedral angle of 56.75 (4)°. The crystal structure of the compound indicates the presence of equimolar enantio-mers (RR and SS) in the crystal structure.