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This paper describes the development and validation of a GC-MS method which allows the simultaneous quantification of 11 endocrine disrupting compounds (EDCs) in surface water samples from both estuary and sea. The analysed EDCs are oestrone (E1), 17 beta-estradiol (E2), 17 alpha-ethynylestradiol (EE2), 4-tertoctylphenol, 4-n-octylphenol, 4-nonylphenol, bisphenol A and finally, mono and diethoxylates of 4-nonylphenol and 4-octylphenol. The method includes the pre-concentration of water samples, 1000-fold factor, in OASIS HLB cartridges by solid phase extraction, the derivatisation of all EDCs by N,O-bis(trimethylsilyl) trifluoroacetamide added with 1% trimethylchlorosilane and pyridine (at 65 degrees C for 30 min) and, finally the stabilisation of the EDCs-silylated derivatives, in hexane, for 72 h. The validation parameters revealed that this method was highly specific for all target compounds using real samples. The linearity of the calibration curves (r(2)) showed correlation factors higher than 0.990. The detection limits ranged from 0.10 to 1.45 ng L(-1), depending on each analysed compound, and recoveries were satisfactory for most of the assayed EDCs (>60%). Analysis of samples from four polluted areas of Douro River estuary and from two points of the Atlantic Ocean (Portugal) showed high amounts of E1 (up to 1.96 ng L(-1)), E2 (up to 14.36 ng L(-1)) and EE2 (up to 2.76 ng L(-1)).