Gjilan (42˚28'08" V, 21˚27'48" L) is one of the seven largest cities in Kosovo. Throughout the city flow three rivers: Mirusha and Stanishor which mix and discharge into the largest river called Morava. The reason for the research of these rivers is the extreme pollution resulting from the discharge of industrial waters. Analysis of these rivers shows that they are extremely polluted and some physicochemical parameters are not in accordance with the regulations of the European Union (EU) and the World Health Organization (WHO). Parameters analysed are: pH, CW, NTU, DO, COD, BOD5, A

Gjilan is one of the largest cities in the Republic of Kosovo. Groundwater samples with a depth of 8-60 m have been taken in this neighbourhood Arbëria, where the samples were taken in three different areas. These groundwaters are used as drinking water and to ascertain that these groundwaters comparing with the WHO regulation. Parameters analysed are: nitrites (NO2-N), nitrates (NO3-N), ammonia (NH3-N), chlorides (Cl-), bicarbonates (HCO3-), alkaline (A-HCl), carbonic strength (CS), NTU, pH, and conductivity in water (CW). The results of this study display the quality of these groundwaters based on the WHO regulation. Some groundwaters are not in accordance with WHO water quality regulations. The groundwaters we have analysed in three areas of the Arbëria neighbourhood in Gjilan Municipality, based on the analysis confirm very well, showing that the land of this neighbourhood has strong layers of lime.

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This research is based on the study of boiler water with a high content of waste inside boilers. After many years of use, a very toxic lime scale (LS) is formed in the boiler mixed with heavy elements, ions, and other molecules dangerous for human health. The high concentration of some heavy metals in domestic boilers is a problem in itself. During our study we created laboratory proof that inside domestic boilers contain extremely high concentrations of some heavy carcinogenic metals. Domestic boilers should have a simple system for cleaning the waste in the boiler that in our research contains heavy metals that can create profoundly serious problems in a person with normal metabolism. The chemical parameters analysed in the domestic boilers are: Cu (0.002-3.08) mg/L, Fe (0.001-0.97) mg/L, Cr +6 (0-0.31) mg/L, Al +3 (0.001-0.8<) mg/L, Ca +2 (56-200<) mg/dm 3 , Cl − (12.3-45) mg/L, Cl 2 (0-2.2) mg/L, PO 4 −3 (0.04-1.3) mg/L, NO 2-N (0.0006-2.9) mg/L, NH 3-N (0.001-0.5) mg/L. The high presence of heavy metals in water has recently been causing serious problems. Scientific research in the field of environmental toxicology has given us more and more answers to the questions of where many human health problems can come.

Pollution with the heavy metals of Kosovo's rivers has been and continues to be a serious concern not only for the population, but also for responsible institutions that deal with environmental protection in our country. Based on this fact and our doubts regarding the quality of the river waters of the Municipality of Gjilan, we were motivated to conduct a study of the quality of the Mirusha, Stanishor and Morava river waters. During our research, we have set eight monitoring points for determining the exact level of concentration of heavy metals in the river waters quoted above. The heavy metals analyzed in this study were: Pb, Hg, Mn, Cu, Fe, Ni, Cr, Cd, Zn and Ba. The analytical technique used to determine the concentration of heavy metals was ICP-OES. The obtained results show that Fe, Mn and Ba exceed the allowed level at several monitoring points of the Mirusha and Stanishor rivers and appears in the degree of pollution with these metals of Morava river waters. The presence of heavy metals in the waters of these rivers negatively affects habitat waters and indirectly human health. Therefore, the identification and then suggestions regarding elimination of polluting sources are the subject of this study.