For evaluating the effect of the Swiss national action plan for risk reduction and sustainable use of plant protection products, a pesticide risk indicator for surface waters was developed by the research institute Agroscope. However, this risk indicator has not been validated with field measurements. Therefore, the project "RisiMo" aimed on validating this risk indicator using pesticide monitoring data from Swiss surface waters. As a data basis, measurements from the programs "NAWA TREND", "NAWA SPEZ", and cantonal monitoring programs were used.