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Aluminium is not essential but could be harmful to human health, being associated with severe diseases of the nervous system, such as Parkinson's disease, amyotrophic lateral sclerosis (Lou Gehrig's disease) and Alzheimer's disease. Dissolved aluminium can become toxic to aquatic life and to the roots of sensitive plant species. Exposure to aluminium from water is a concern in Sofia region since its concentrations occasionally exceed the environmental quality standard for Iskar river, which is the main drinking wa...

The monitoring data of groundwater quality in a vast area in north central Bulgaria indicates concentration of hexavalent chromium above the maximum contaminant level set in Directive 98/83/EO. Hexavalent chromium contamination of the groundwater is of a great concern, since this groundwater is the main drinking water source for more than 25 small villages in the region. Field tests were conducted in order to determine the mineral and chemical composition of soils and rocks near four of the villages. Exploratory d...

Groundwater is one of the main resources for drinking- and industrial water supply in Bulgaria. Investigations of a number of groundwater sources indicate concentrations of toxic elements or metal ions, considerably exceeding the maximum contaminant values. Pollution with arsenic has been found in the region of Dimitrovgrad, Merichleri, Haskovo, Kyustendil. Increased content of manganese, iron and sulphates is available in some districts of Sofia, Dimitrovgrad, Haskovo, Svishtov. Presence of excessive concentratio...