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The results show highest rates of exceedances from 2007 to 2012 with a peak in 2012 by insecticides. In 2012, at some 50% of all sampled monitoring sites, exceedances seem to occur. After 2012, rate of exceedance of insecticides decreased significantly to 5% of all monitoring sites in 2017. The reason might be a bias of values lower the levels of detection (LOQ). These LOQ’s were not reported from many sites, substances or countries. So we had to detect values lower than LOQ from checks of the data (e.g. many aggregated data sets, in which we found that minimum and maximum had the same values, told us that all values were below LOQ and LOQ was reported as minimum and maximum). It might be that the rules of these checks did not catch all these values lower LOQ.