Figure 1. The movement of pesticide in the hydrologic cycle. Diffuse water pollution through pesticides occurs either due to evaporation (4) with short and long-distance transfer (5), surface runoff (8) or leaching to groundwater (13). 1 - pesticide application; 2 - absorbed by crop; 3 - degraded by ultraviolet light; 4 - evaporation (vaporized to atmosphere); 5 - short and long-distance transport; 6 - deposited by rainfall; 7 - runoff; 8 - surface runoff to lakes and rivers; 9 - polluted waters; 10 - seepage; 11 - adheres to soil particles; 12 - biodegradation (degraded by bacterial oxidation or chemical hydrolysis); 13 - leaching (groundwater discharge to streams); 14 - pollution of surrounding territory.