Council Directive (91/271/EEC) of 21 May 1991

Policy Document
Council Directive of 21 May 1991 concerning urban waste water treatment (91/271/EEC)

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Nutrients in transitional, coastal and marine waters Nutrients in transitional, coastal and marine waters This indicator illustrates the levels and trends in winter means of dissolved inorganic nitrogen (nitrate + nitrite + ammonium), oxidised nitrogen (nitrate + nitrite) and phosphate concentrations (micromol/l) in the regional seas of Europe.
Chlorophyll in transitional, coastal and marine waters Chlorophyll in transitional, coastal and marine waters The indicator shows 1) annual mean summer surface concentrations (microgram/l), 2) classification of concentration levels (i.e. low, moderate, high) and 3) trends in mean summer surface concentrations of chlorophyll-a (microgram/l) in the regional seas of Europe. Summer period is: June to September for stations north of latitude 59 degrees in the Baltic Sea (Gulf of Bothnia and Gulf of Finland)  May to September for all other stations  The used regional and subregional seas of Europe are in line with the geographical regions and sub-regions specified in the Marine Strategy Framework Directive (MSFD).  Other European Seas (Icelandic Sea, The Norwegian Sea, the Barents Sea and the White Sea) are not covered in this indicator due to current lack of data.
Nutrients in transitional, coastal and marine waters Nutrients in transitional, coastal and marine waters The indicator shows 1) annual winter concentrations (micromol/l); 2) classification of concentration levels (i.e. low, moderate, high) and 3) trends in winter oxidised nitrogen (nitrate + nitrite) and phosphate concentration (micromol/l)in the regional seas of Europe.  Levels and trends of winter concentrations of dissolved inorganic nutrients are used for this indicator, as it is assumed that winter concentrations are not significantly reduced due to uptake by primary producers. The winter period is defined as follows: January, February and March for stations east of longitude 15 degrees (Bornholm) in the Baltic Sea  January and February for all other stations. The used regional and subregional seas of Europe are in line with the geographical regions and sub-regions specified in the Marine Strategy Framework Directive (MSFD).  Other European Seas (Icelandic Sea, The Norwegian Sea, the Barents Sea and the White Sea) are not covered in this indicator due to current lack of data. 
Nutrients in freshwater Nutrients in freshwater This indicator shows concentrations of orthophosphate and nitrate in rivers, total phosphorus in lakes and nitrate in groundwater bodies. The indicator can be used to illustrate geographical variations in current nutrient concentrations and temporal trends.
Urban waste water treatment Urban waste water treatment The indicator on waste water treatment CSI 024 is defined as the percentage of the population connected to sewage collection systems as well as primary, secondary and tertiary waste water treatment plants. The amount of the waste water is expressed as population equivalents (p.e.). The indicator illustrates: development of waste water collection and treatment in Europe since the 1970s; development of more stringent waste water treatment; level of waste water treatment in large cities (agglomerations >150 000 p.e.) in the EU.  
Oxygen consuming substances in rivers Oxygen consuming substances in rivers This indicator illustrates the current situation and trends regarding  biochemical oxygen demand ( BOD) and concentrations of total ammonium (NH 4 ) in rivers. The key indicator for the oxygenation status of water bodies is BOD, which is the demand for oxygen resulting from organisms in water that consume oxidisable organic matter.

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For references, please go to https://www.eea.europa.eu/policy-documents/council-directive-91-271-eec or scan the QR code.

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