!!!Gewässergüte

Rivers and Streams, Biological Quality of: Running bodies of water in 
Austria are biologically assessed with the saprobic system, which is 
based on the interconnection between water pollution and the increase 
in the amount of certain organisms present in the water. Bodies of 
water are graded in four classes, shown by different colours in the 
Water quality maps which have been published since 1968 by the  
Ministry of Agriculture: Class I - hardly polluted (blue), 
class II - moderately polluted (green), class III - 
considerably polluted (yellow), class IV - extra-ordinarily 
polluted (red). In the past two decades water quality has improved 
significantly due to purification plants, in particular as regards 
poorly biodegradable and toxic substances.


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