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The pesticide pollution from agricultural activities of surface waters or groundwater may have different sources: a) Diffuse losses, e.g. spray drift due to pesticide application, b) point sources from waste water treatment plants (run-off from farmyards connected to sewer systems), c) surface run-off from farmyards during cleaning of application techniques, and d) leaching to field drains or to shallow groundwater (Sandin, 2017; Aktar, et al., 2009). In addition to agricultural activities, other relevant sources for pesticides include forestry, municipial use (e.g. on roadside), grasslands (e.g. golf courses) and uses in gardens. Once pesticides reach streams, they can be widely dispersed into other streams, rivers, lakes, reservoirs, and oceans (USGS, 1997).