Directives of water pollution control published in Official Journal dated 31.12.2004 is the base of protecting and keeping contamination of surface waters under control. European Commission has also issued directive 91/71/EEC for the efficiency of the wastewater treatment and directive 2013/39/EU for the environmental quality standards in the field of water policy. In order to control and improve measurement quality of waste water, the certified reference material is getting importance. In this project, the production of certified reference material based on ISO Guides 34-35 is defined and preliminary studies have been performed. This reference material aims to ensure a common reference point for method development and validation for elemental analysis in waste water.