The lack of drinking water in Zajecar was the main reason for building of water barrier on the Grliste river and making the water reservoir. A factory for water processing was also built, but the problems were not disappeared. The conclusion is that the main solution for this ecosystem was in establishing of an monitoring system. That is the reason why we talk out the results of the monitoring and the troubles in this water source as well as in the phases of water processing.

The aim of this work is to confirm water quality of the littoral zone of Lake Ohrid at tourist locations during the tourist season 2002. Water quality is presented through following microbiological and chemical parameters: number of psychrophilic and mesophilic heterotrophic bacteria, urolitic bacteria, most probable number of total coliforms (MPN), indicators for fecal pollution (Escherichia coli, Clostridium perfringens), chlorophyll a, dissolved oxygen, biochemical oxygen demand for five days (BOD5), organic loading and total nitrogen.

In scope of complex physical-chemical and biological examination of water quality of the Bocac lake, the river Vrbas and tributaries Ugar and Crna Rijeka, examinations of phytoplankton and zooplankton were performed during 2002 (March-November). In qualitative structure of phytoplankton 7 division were registered, with 93 taxa from 49 genera in total. In warmer period extreme domination have fire algae (Pyrrophyta). In zooplankton structure (Rotatoria, Cladocera, Copepoda) 78 taxa were registered from 36 genera, with distinct domination of Rotatoria group. According to saprobiological analysis species of olligo- and beta-mesosaprobic character are prevailing.

According to the plans, the town of Gacko tends to be water supplied from the water reservoir Vrba located at the river Vrba. About 150 to 200 m away is located ash basin. All ash basin area is oriented to the water reservoir and leaking water going directly to the water reservoir. The leaking water has high pH value, alkalinity, high content of sodium, potassium and sulphates. There are some heavy metals, but their concentrations are not significant. The influence of those contaminated water on the lake water quality is only little evident because of the high dilution rate.

Bacteriological examination have been carried out within the comprehensive hydrochemical and hydrobiological investigation of river Koselska during 2002. The aim of investigations is to confirm condition of bacteriological communities and water quality of river Koselska. The results of investigations shows pollution by organic matter. In order to prevent further eutrophication processes, certain measures of river water protection and conservation should be undertaken. Also, the regular monitoring of water quality should be established.

The paper gives the contribute to analyses of the problem of Crnojevica river (Montenegro, Serbia&Montenegro) water pollution. The analyze surround measurement the next parameters: pH, conductivity, oxygen balance, sanitary parameters, content of different form of phosphorus. These measurements are carried out over five sampling series, at the seven stations, including underground flow rate in the Obod cave. Our estimations are confirmed the continuity of the Crnojevica river pollution, by municipality and strain water from Cetinje urban area. Nutrients, especially phosphates, from the pollution emission, attend conditions (together with many natural factors) for production biomass quantity. The opposite processes, the inhibition processes, exist. Phosphorus in the water attends increase level of the water pollution (over increase eutrophication degree), so the water is out of the legal class, because its usage is limited.

Water quality examination of water source Zagoric, was conducted with aim to determine water quality on the bases of physico-chemical parameters, in dry and rainy period. Water supply system in Podgorica scopes several water supply sources out of which Mareza and Zagoric have the greatest capacity. The aim of this study was to determine hygienic quality of water in operational and dug wells on representative locations in flow areas, and on the basis of obtained results to estimate its influence on population health.

The results of the regular water quality monitoring in the river Moraca (Montenegro, Serbia&Montenegro), are presented in this paper. Thirty samples have been processed from six measuring station along the river's flow. The data relevant quality indicators (conductivity, dissolved oxygen, chemical oxygen demand, five days biochemical oxygen demand, ammonia, nitrites, nitrates, and phosphates) have been processed in the light of the existing regulations. It has been confirmed that the water quality, from the physical-chemical aspect, varies depending on the measuring location and the hydrological situation. The evaluated condition shows that the water quality gets worse, in the period of the five years, on the profiles of downstream places from Podgorica. The level of decrease gets to deviation from the requested A2CII class. It is particularly shown in the changes of the values for the nutrients and the relevant indicators of the organic pollution (dissolved oxygen, five days biochemical oxygen demand, chemical oxygen demand), which we presume can be consequence of the effect of the algaes during the period of the "low level water".

This paper presents the most important results on water quality investigation of the Danube river in the Iron Gate reservoir. The investigations are conducted by the Institute Jaroslav Cerni by means of regular monitoring renewed after a long pause in 2001. The determined phenomena are considered in regard to water quality of the Danube river in the upstream zone.

In order to increased the amount of water in Sjenica water reservoir (because of higher production of electric energy by hydroelectrical power plant), stagnant waters of Pester field were irrigated to Vapa river and Sjenica lake. Former swamp areas and theirs life communities, represented specific biological filter in Pester high, a kind of natural lagoons, where big amounts of polluted water with nutrients were spent a processed (especially salts of P and N) were characteristic for exact area because of intensive cattle production. After the irrigation on Pester field, raw, polluted water with the large amount of nutrients by Vapa river get to the Sjenica water reservoir where they represented main cause of eutrophication and degradation of water quality in this aquatorium. Heterogenic and numerous algal association in canal of the Pester field is nearly leftover of previous specific algological flora which testifies the presence of species Chaetophora incrassata Hazen (new habitat in Serbia), the first class water indicator.