The influence of water on the adsorption of stearic acid, octadecylamine, and octadecyl alcohol from toluene solutions on the surface of TiO2 was investigated. It was found that in the presence of water the chemisorption of the acid on the pure rutile is decreased, the chemisorption of the amine remains the same as under anhydrous conditions, and there is no chemisorption of the alcohol on TiO2. The magnitude and character of surfactant adsorption is shown to be highly affected by inorganic impurities in TiO2.