Trophic State refers to the degree at which organic matter accumulates in the water body and is most commonly used in relation to monitoring eutrophication (process of excessive growth of algae resulting in oxygen depletion, it is commonly caused by human activities, it can be occasional or frequent). The data show the total percentage deviation, from a baseline for trophic state. A five year baseline (2006- 2010), per lake, has been produced for both parameters. This is used to measure change against recent years (2017-2019). The data represent the number of lakes impacted by a degradation of their environmental conditions (i.e. showing a deviation in turbidity and trophic state from the baseline) compared to the total number of lakes within a country. The values produced account for different sized lakes.

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