The structure of water present in water‐in‐oil microemulsions of anionic magnesium bis(2‐ethylhexyl) sulfosuccinate in C6D6, cationic cetyldimethylbenzylammonium chloride in C6D6, cetyldimethyl‐3‐phenylpropylammonium chloride in chlorobenzene, and nonionic polyoxyethylene (4) dodecyl ether in n‐heptane was probed by 1H NMR. Chemical shifts of solubilized H2O‐D2O, and of surfactant discrete protons were determined, at fixed [water]/[surfactant] ratios, as a function of the deuterium content of solubilized water. Chemical shift data were used to calculate the so called “fractionation factor”, φ, of the aggregate‐solubilized water. Calculated φ for the different systems are unity, showing that micellar water, although different from bulk water, does not seem to coexist in “layers” of different degrees of structure, as suggested, e.g., by the two‐state water solubilization model.