PLAP is an intensive monitoring programme aimed at evaluating the leaching risk of pesticides and/or their degradation products under field conditions. The programme was initiated in 1998 by the Danish Parliament and has the objective to improve the scientific foundation for decision-making in Danish regulation of pesticides by enabling field studies to be included in risk assessment of selected pesticides. The specific aim is to evaluate whether approved pesticides applied in accordance with current regulations and maximum permitted dosages according to crop and BBCH stages, under actual, Danish field conditions can result in leaching of the pesticides and/or their degradation products to the groundwater in concentrations exceeding the limit value of 0.1 μg/L for groundwater and drinking water. The PLAP is headed by the Geological Survey of Denmark and Greenland (GEUS) in close cooperation with the Department of Agroecology (AGRO) at Aarhus University, as subsupplier, the Department of Ecoscience (ECOS) at Aarhus University and the Danish Environmental Protection Agency (EPA).