Exceedances of (left) effect thresholds in Europe’s surface waters for the pesticide imidacloprid in 2020; and (right) quality standards in Europe’s groundwater for the pesticide atrazine in 2020

Figure Created 21 Apr 2023 Published 03 May 2023 Last modified 03 May 2023
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The maps show the monitoring sites in Europe that exceeded effect or quality thresholds for (left) imidacloprid in surface waters (right) atrazine in groundwater in the year 2020. The classification of 'unknown’ for some monitoring sites means that the substance was detected but the concentration was below the limit of quantification (LoQ) and the LoQ was higher than the assessment threshold. This means that it is impossible to determine whether there was an exceedance or not. The data reported for imidacloprid in surface waters cover 16 countries. The data reported for atrazine cover 18 countries. The monitoring results are reported under the Water Information System for Europe State of Environment (WISE SoE) reporting, more specifically WISE 6, and the spatial data for the monitoring sites are reported under the Water Framework Directive and the WISE 5 Spatial data reporting.

European data


Additional information

For the methodology used to calculate exceedances of effect or quality threshold, see ETC/ICM, 2020, Pesticides in European rivers, lakes and groundwaters — data assessment, ETC/ICM Technical Report 1/2020, European Topic Centre on Inland, Coastal and Marine Waters ( accessed 20 January 2023.


Geographic coverage

Temporal coverage


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Filed under: water, pesticides, pollution
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