Pesticides can also be found in rain, ground water, streams, rivers, lakes and oceans. There are 4 major ways that pesticides can reach the water: it can drift outside of the area of where was sprayed, it may leach through the soil, it could be carried as runoff, or it may be spilled accidentally. Studies by the UK government show that pesticide concentrations exceed those allowable for drinking water in some samples of river water and groundwater.