The aqueous solubilities are reported and correlated for 2,4-dichlorophenol, 2,4,6-trichlorophenol, 2,3,4,6-tetrachlorophenol, and pentachlorophenol over the pH range 2 to 14 as measured by high-pressure liquid chromatography with UV detection at 25 degrees C. Correlation equations are proposed to estimate the aqueous solubility of these chlorophenols as a function of pH.