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The data on hazardous substances in water (including pesticides) from the Waterbase - Water Quality database were systematically assessed in the ETC/ICM technical report on Hazardous Substances in European Waters from (ETC/ICM 2015), covering the data for the period 2002-2011. The report summarises the state and availability of the data and provides a useful display of the large dataset, but cannot be regarded as an assessment of the situation between the reporting countries. It was concluded that despite the quality check procedures in place, some data were still questionable owing mainly to issues such as unclear reporting of limit of detection (LOD) or limit of quantification (LOQ).

This report gives an updated assessment of the Waterbase – Water Quality data, also using a new approach in data selection and processing, explained in the following subsection.