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Between 2013 and 2020, pesticides were reported from a total of 9,768 monitoring sites for surface waters and 13,863 sites for groundwater. The number of monitoring sites reporting data for surface waters varies by country from less than 10 sites (Hungary, Iceland, Luxembourg, Switzerland) to more than 1,000 sites (France, Italy, Spain). There is similar variation in groundwater monitoring sites: numbers range from 54 sites in Lithuania to more than 3,000 sites in Italy (and more than 1,000 sites in Austria, Denmark, France, Germany, Spain).
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It may be relevant to add another weight to take into account the length of the list of monitored pesticides; the weighted mean by the area is not sufficent to avoid some bia in this data set (the number of monitored pesticides is not proportionnal to the country area)
COUNTRIES | AREA (km2) | MONITORED PESTICIDES
Switzerland | 41 285 | < 10
Csezia | 78 871 | > 100
Norway | 385 207 | < 10
Some countries are reporting and monitoring only tap water monitoring points, what can't be compared with general survey. Tap water sites are selectioned for that issue, more protected, and therefore less polluted in each country. Thus the precision on the type of survey should by useful.