In the title compound, [NH(C(2)H(5))(3)][Fe(C(14)H(8)N(2)O(5))(2)]·H(2)O, the iron(III) ion is hexa-coordinated by four O atoms in the basal plane [Fe-O distances in the range 1.904 (4)-1.909 (4) Å] and two N atoms in the axial plane [Fe-N = 1.981 (4) and 1.985 (4) Å] of two tridentate fully deprotonated 2-{[(2-oxido-5-nitro-phen-yl)methyl-ene]amino}-benzoato (H(2)L) ligands, forming a tetra-gonally elongated octa-hedral geometry. The triethyl-ammonium cations and complex anions are linked by N-H⋯O hydrogen bonds into chains parallel to [100]. Disordered water mol-ecules (occupancy ratio 0.6:0.4) occupy the voids in the crystal structure.