Scientific Opinion on the report of the FOCUS groundwater working group (FOCUS, 2009): assessment of higher tiers

Drinking water, protection goal, pesticides, risk assessment, authorisation, leaching scenarios
First published in the EFSA Journal
28 June 2013
20 June 2013
Scientific Opinion

Competing interests: Two members of the Panel did not participate in the discussion on the subject referred to above because of potential conflicts of interest identified in accordance with the EFSA policy on declarations of interests.


Following a request from the European Commission, the Panel on Plant Protection Products and their Residues (PPR) was asked to deliver a scientific opinion on the report of the FOCUS groundwater working group (FOCUS, 2009) with respect to the higher tier leaching assessments. The PPR Panel is of the general opinion that, as suggested in the FOCUS report, substance parameter refinement can be applied in risk assessment. State of the art knowledge has developed to such an extent that scenario refinement is feasible as well, but will make assessment more complex unless embedded in basic tools and adequate guidance. The same is true for spatial modelling but establishment of adequate databases will require quite some effort. The Panel considers current knowledge on groundwater hydrology insufficient for implementation of monitoring as the highest tier of the assessment at the European level. The implementation of scenario refinement and spatial modelling requires clear criteria on the extent of arable surface areas with estimated leaching rates below the threshold level.

Panel members at the time of adoption

Alf Aagaard, Theo Brock, Ettore Capri, Sabine Duquesne, Metka Filipic, Antonio F. Hernandez-Jerez, Karen I. Hirsch-Ernst, Susanne Hougaard Bennekou, Michael Klein, Thomas Kuhl, Ryszard Laskowski, Matthias Liess, Alberto Mantovani, Colin Ockleford, Bernadette Ossendorp, Daniel Pickford, Robert Smith, Paulo Sousa, Ingvar Sundh, Aaldrik Tiktak, Ton van der Linden.
Panel on Plant Protection Products and their Residues
pesticides.ppr [at]
EFSA Journal 2013;11(6):3291
Question Number
On request from
European Commission