This European Standard specifies a method for the determination of selected organochlorine pesticides (OCP, see Table 1), in water samples. The method uses solid-phase extraction with SPE-disks followed by gas chromatography-mass spectrometry (GC-MS). It is applicable to the analysis of OCPs in surface water containing suspended particulate matter (SPM) up to 500 mg/l (whole water samples), drinking water and groundwater. The lower limit of the working range depends on the matrix, on the specific compound to be analyzed and on the sensitivity of the mass spectrometric detection unit. For compounds listed in Table 1 the limit of determination (LOQ) it is at least 30 % of the corresponding AA-EQS value (0,000 15 µg/l to 0,1 µg/l) according to the requirements of the European EQS Directive 2008/105/EC for both inland surface waters and other surface waters.This method may be used for the analysis of other OCPs not listed in Table 1 or other types of water. However, it is necessary to verify its applicability before use.(...)