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Table 1 Categories used for the classification of the Trophic State Index

From: Integrated approach to the understanding of the degradation of an urban river: local perceptions, environmental parameters and geoprocessing

Category Trophic State Index (TSI)
Ultraoligotrophic TSI ≤ 47
Oligotrophic 47 < TSI ≤ 52
Mesotrophic 52 < TSI ≤ 59
Eutrophic 59 < TSI ≤ 63
Supereutrophic 63 < TSI ≤ 67
Hypereutrophic TSI > 67
  1. Categories used for the classification of the Trophic State Index. Source: CETESB (2013)