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Figure 4.3 shows the rate of exceedance over the time period from 2007 to 2017 of the three groups insecticides, herbicides and fungicides in groundwater monitoring stations. The results show by far highest rates of exceedances of herbicides with a probably slightly decreasing trend from 8-10% in 2007-2009 to 7–8 % in 2015 - 2017. The exceedance rates at monitoring stations occurs also for insecticides, but this might have the same LoQ-based reasons as discussed for surface waters. The rate starts with 2-7.5% until 2012 and decrease to 0.5% after 2012. Fungicides show, like the results in surface waters, the lowest exceedance rates over the whole time period with a small peak in 2010 (which cannot be interpreted in detail). Overall, the exceedance rates at groundwater monitoring stations are much lower than exceedance rates in surface waters.
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There seem to be three words missing in the 3rd sentence (should read: "the DECREASING TREND OF exceedances..."). More importantly, it is highly unlikely that issues with the LoQ and a resulting bias is responsible for the observed decline. This may be partially true for SW, where EQS limit values keep changing and can be far below 0.1 µg/L. But in groundwater the limit value is fixed at 0.1 µg/L for decades, and any official groundwater analysis done within the last 20 years will have used a method that fully covers that LoQ.
Last sentence: direct comparison between SW and GW regarding number of AI and/or metabolites exceedances should not be made.