In the Netherlands, 60% of drinking water is abstracted from groundwater. Groundwater quality is monitored on a regular basis by the regional authorities and the water companies that use groundwater for the production of drinking water. The Groundwater Atlas for pesticides improves access to the pesticide monitoring results and a procedure is proposed for the use in registration. The aim of the procedure is to provide a plausible relationship between the presence of a substance in groundwater and the authorised use. It is recommended to evaluate the results obtained from the procedure in a number of risk assessment cases for a plant protection product based on an active ingredient which is already on the market.