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The emission data for the priority substances were calculated as described below.

Data reported for the E-PRTR Regulation on industrial wastewater (P10) and UWWTPs (P8) are included in Figures 3.1-3.13. E-PRTR uses capacity thresholds (i.e. >100.000 p.e. for UWWTP and pollutant thresholds that vary per pollutant.

The datasource used was database version 11 (EEA, 2017a). To get an indication about possible trends in time, two years were considered: 2010 and 2015. Because data were not necessarily availabile for each year, the following selection process was applied. For 2010, data from 2010 were selected, then from 2011 if data from 2010 not available and then from 2009 if data from 2011 not available. In the case that no data were reported for 2009-2011, then no data were recorded for that substance by that country. Similarly, for 2015 data, 2015 was the preferred dataset, then 2014.  If no data was reported for 2015 or 2014, no data was recorded for that country.

Data are included from the Water Information System Europe State of Environment (WISE SoE) emissions dataset. Industry (P10), UWWTPs (P8) and diffuse sources (other pathways) were used, from Waterbase_2015_v1_WISE1 (EEA, 2015b). Emissions data for 2010 were selected in similar way to E-PRTR data (i.e. from 2009-11 datasets). 2014 data were used as the latest available, 2013 data were used if 2014 data were not available.

WFD emission data for the year 2010 are included for Member States that reported via the WFD input inventory (EEA, 2017b). In some cases MS used another year for reporting (sometimes 2009) or an average of a number of years (like 2008/2009/2010). In that case the closest year to 2010 or the reported average is used. Because this dataset contained a number of errors and inconsistent data, an update of this dataset is used for this report. Depending on the pollutant, only 3-13 Member States reported data for industry and UWWTPs. Diffuse sources were only reported by a few MS. Most MS only reported a subset of river basin districts in the country.

Diffuse loads to surface water were estimated for 2010 by Roovaart et al (2013a, 2013b) for all EU Member States for a number of pollutants. Loads are estimated for agriculture (P3, P4, P5), direct deposition to waters (P1), road transport (P6, P7), inland shipping (P12), not connected households (P9) and UWWTPs not in E-PRTR < 100 000 pe (part of P8). Per pollutant, the load for these sectors is estimated, so it does not represent the total load of all existing diffuse sources.

The WFD dataset contains a number of double counting, inconsistencies and incorrect values, which makes it hard to interpret the data;

Different years are used by the Member States for the different reporting streams and different reported data on the same sources appear to be inconsistent with each other;
Different definitions about diffuse sources are used by the Member States.
In this context, numbers in the emissions tables and figures should be understood to be of low confidence. The loads given in the tables from different data sources cannot be summed, as there may be double counting.