Babeni reservoir is situated on the Olt River, near the chemical platform Rm.Valcea. A large amount of sediments has been deposited since the dam building, 30 years ago. A great role was played by the tributaries Bistriţa and Topolog that flow into Băbeni reservoir. Both rivers built important deltas filling the reservoir. Grain-size distribution is in accordance with the evolution of the filling process. Most sediments present great concentrations of heavy metals. The mercury stands out with very high values, up to 8 μg/g. Other metals with concentrations higher than the norms are Ni, Cu and Cr. Cleaning the site is an expensive challenge.