The article concentrates on the researches conducted in the case of four surface water sources. In order to emphasize the impact the economic activity of the area has on water quality, we propose to determine the level of organic micropollutants identified within the water. The samples of water for the analysis were taken in 2009, during January and May, and for the analysis we chose to use the method of gas chromatography due to its accuracy. Two of the water sources under analysis allowed us to determine the impact the agricultural activities can have upon the surface water quality. Thus, within the water samples taken from Galbeni and Dragesti, the analysis has identified the existence of polycyclic hydrocarbons, organophosphoric pesticides and fungicides in different concentrations. Excessive treatment of soil, followed by the leakage of rain water and irrigation from these surfaces, leads these substances within Siret basin damaging the water and causing a powerful pollution. Viewing the research of industrial activity impact, there were taken water samples from the downstream of two companies with different fields of activity, such as S.C. Amurco, a manufacturer of chemical fertilizers and SC Letea, a pulp and paper factory. In the case of water samples within Letea source, the chromatographic analysis identified components of which the highest concentrations were recorded in the case of semi-volatile organic chlorinated compounds, substances used in paper manufacturing and also in the case of organochlorine pesticides. In the case of the water sample taken within Amurco downstream, the highest concentrations were recorded in the case of polycyclic hydrocarbons, while the maximum legal concentration was exceeded in the case of anthracene, carbazole, fluoranthene and pyrene. Protecting the water quality water sources requires taking the following measures: monitoring and controlling the treatments applied to crops, developing the manufacturing technology and the existence of better cleaning stations.
