The Siret River Basin is located in Eastern Romania, occupying most of the Moldovian Provence. It springs from the Carpathian Forests in Ukraine and flows into the Danube after a route of 726 km. The total area of the Siret River Basin is 47610 km 2 and the multiannual average flow at the confluence with the Danube is 240m 3 /s. On the Romanian territory, the length of the Siret River is 590 km and the catchment area is 42890 km 2 . The basic characteristics of the hydrological regime are determined by the large share of mountain affluents, located on the right side: Suceava river (L = 173 km, S = 2643 km 2 ), Moldova River (L = 213 km, S = 4299 km 2 ), Bistrita River (L = 283 km, S = 7039 km 2 ), Trotus River (L = 162 km, S = 4456 km 2 ), Putna River (L = 153 km, S = 2480 km 2 ), Ramnicu Sarat River (L = 137 km, S = 1063 km 2 ) and Buzau River (L = 302 km, S = 5264 km 2 ). The only important affluent on the left side of the Siret River is Barlad River (L = 207 km, S = 7220km 2 ), which drains the plateau areas. Most of the Siret River basin located in Romania is administrated by the Directorate of Siret Waters (27 402 km 2 ), the remaining pool being administrated by the Water Directorate Buzau - Ialomita (BH Buzau with other small affluents on the right side of the Lower Siret River) and Prut Water Directorate (BH Barlad and several smaller affluents on the left side of the lower Siret River). Siret River is the second longest river (after Prut River) flowing into the Danube, close to the city of Galati (over 300 000 inhabitants). In the confluence section, Danube has a multiannual average flow of 6000 m 3 /s, which means over 24 times more than the flow of Siret River. In this paper I will present a succinct evolution of the quality of water in Siret River, between 1995 and 2011, and a tendency of this water quality, from the river’s entrance on Romanian territory until its flow into the Danube. The study about the Siret River water quality is based on data collected by the Directorate of Siret Waters, where I have been working for the past 20 years. To anticipate the water quality tendencies, I took into account the following: - the results from water quality monitoring between 1995 and 2011; - the tendencies of demographic and economic development in the Siret River Basin; - the constraints regarding water pollution reduction, so that any section of the river has good quality water, according to the main purpose of 60/2000/CE Directive, issued by the European Parliament and the European Union Council.