A flowing afterglow apparatus in conjunction with laser induced fluorescence (LIF) diagnostics has been used to determine the yield of OH(v = 0,1) produced by the dissociative recombination (DR) of H3O+ ions with electrons at 300 K. The yield for v = 0 radicals (0.48 +/- 0.07) was determined by two different methods : (1) by comparing it to the known OH yield of the ion-molecule reaction Ar+ +H2O and (2) by comparing it to that of the reaction of metastable Ar atoms (Ar*) with H2O. The yield of vibrationally excited OH(v = 1) (0.12 +/- 0.02) was obtained relative to that in v = 0 by comparing LIF spectra. The results corroborate earlier experimental work which determined the yields of OH in v = 0 and in unspecified vibrationally excited states v > 0.