In the title compound, [Co(C(10)H(12)NO(2))(3)]·H(2)O, the Co(III) ion is coordinated by three O atoms and three N atoms from three bidentate 2-eth-oxy-6-(methyl-imino-meth-yl)phenolate ligands in a slightly distorted octa-hedral environment. The water mol-ecule connects two ligands by O-H⋯O hydrogen bonds. One terminal methyl group is disordered over two positions, with site-occupancy factors of 0.412 (15) and 0.588 (15).