Due to the human activities it is discharged into the surface waters and groundwaters a large amount of the
priority hazardous substances, which could have serious consequences for aquatic ecosystems and human
health. The Aries River basin is located on the central-western of Romania teritory, it occupies the central
upper and middle part of the Apuseni Mountains and in the downstream the lowland Turda – Campia Turzii
from the western Transylvanian Depression. Aries is continuously polluted with heavy metals from the
mining in the area, which currently have been mostly closed. The paper aims is to study Aries river water
contamination due to mining activities by determination of the evolution of priority hazardous substances
concentrations.