Trophic level

Nutrients enrichment

Total Phosphorus (µg/l)

CHL-a (µg/l)

Water transparency (m)

Oligotrophic

Low nourrished waters

≤10

≤3

≥5

Oligo-mesotrophic

Moderately nourrished waters

7 - 13

2.5 - 3.5

4 - 6

Mesotrophic

10 - 30

3 - 8

2.5 - 5

Meso-eutrophic

Well nourrished waters

20 - 35

6.5 -10

2 - 3

Eutrophic

>30

>8

<2.5