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The most important impacts of these pollution pressures is nutrient enrichment (figure 5.3).  In rivers as well as in transitional waters, there are almost similar proportions of water bodies exposed to diffuse source pollution as those affected by nutrient enrichment (ca. 30%).  In coastal waters more than 40% of the classified water bodies are reported to be affected by nutrient enrichment, which is twice as much as the proportion exposed to diffuse pollution.  This reasons for this discrepancy is unclear, but may be related to reporting mistakes or other unidentified pressures.  For lakes, less than 20% of the classified water bodies are reported to be affected by nutrient enrichment.  As for diffuse pollution this low proportion of lakes affected by nutrient enrichment is due to the high number of lakes found in the northern parts of Sweden and Finland.  Organic enrichment is reported to affect between 10-15% of all classified water bodies in rivers, lakes and coastal waters, but is more important in transitional waters, where the proportion of affected water bodies is close to 30%. The latter is consistent with the high proportion of transitional water bodies exposed to point source pollution.