The title compound, C(16)H(12)F(3)N(3)O(5)S·H(2)O, was prepared by reaction of 4-nitro-benzaldehyde, 4,4,4-trifluoro-1-(thio-phen-2-yl)butane-1,3-dione and urea. The asymmetric unit contains two independent mol-ecules, with essentially identical geom-etries and conformations. The dihydro-pyrimidine rings adopt a half-chair conformation. The dihedral angles between the benzene ring and the thio-phene ring are 54.82 (8) and 58.72 (8)° in the two mol-ecules. The mol-ecular conformation of one of the mol-ecules is stabilized by two intra-molecular O-H⋯O hydrogen bonds, generating an S(6) ring. The crystal structure is stabilized by inter-molecular O-H⋯O and N-H⋯O hydrogen bonds.