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Organic matter and ammonium in rivers and nutrients in freshwater are used as measure to assess the situation of water quality in the region. The present state of water is defined as the average for the last three years with available data. For the pollutants in question there are no general thresholds for assessing whether the concentrations are acceptable or not from an ecological perspective. Such thresholds vary with water body type, characterised by factors such as geology, climate and or altitude. The present state of water quality gives an indication of the pollution situation and shows whether the pollution is mainly a local issue, affecting a few sites, or a general issue nationally or regionally. The different Eastern Partnership countries often have national targets or maximum permissible concentrations for pollutants, but these are frequently quite high and may be targeted at other purposes than protecting the ecosystem, such as the use of water as drinking water. They are referred to in the next section. As a general reference, the targets for ammonium concentration and biochemical oxygen demand (BOD) in the EU Fish Directive (2006) are also used([1]).

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