Timis River is the most important river of Banat historical region, springing from the crystalline massif of Semenic, under the Piatra Goznei Peak, from the approximate altitude of 1135 m, and it discharges on a total length of 249 km up to the confluence point with the Danube, located in the South of Pancevo locality, on the current territory of Serbia [9, as amended].
The computation of the WQI for two of the most important rivers from Banat (Timis and Bega) has been performed taking into account the mean annual values of each quality parameter, which were registered at the six monitoring stations on the Timis River (Sadova Veche, Potoc, Lugoj, Hitias, [section]ag, and Graniceri) and at the four monitoring stations on the Bega River (Luncanii de Jos, Baling Timisoara, and Otelec).
At Sadova Veche and Potoc monitoring stations, located on the upper course of Timis River, the water quality status is good (70-90%), according to the average, maximum, and minimum annual values of the analyzed parameters during the period under review (2004-2014), which make these sampling stations fall into the "lowest concern" category (Table 2).
Downstream on the Timis River beginning with Lugoj monitoring section until the border between Romania and Serbia the water quality is preserved in good condition according to the mean and minimum annual values.
The values of the water quality index from these stations correspond to the moderate class, which are influenced by the nutrients, respectively, by the high values of the nitrates from Timis river water, as a result of the agricultural practices, municipal and industrial wastewaters, manure from farms, and so on.
The water quality of the Timis River is influenced by many factors including the quantitative variation of biogenic and organic substances.
The waters of Timis River and Bega River at the exit from Romania country are much polluted because the rivers quality state suffers a slight depreciations downstream thanks to effects of the urban sewage, of the urban wastewaters, of the agricultural wastes, and of the natural causes such as erosion in the hydrographical basins of these main rivers from Banat .
Iancu, "Monitoring and evaluation of Timis River (Banat, Romania) water quality based on physicochemical and microbiological analysis," Transylvanian Review of Systematical and Ecological Research, vol.
Bertici, "Quality indices of the water in the middle Timis River basin," Annals of the University of Oradea, Environmental Protection Fascicle, vol.