Assessment of water quality in the Poso Watershed based on the pollution index and carlson trophic status index

Abstract

Poso watershed was located in South Sulawesi Province, Indonesia. Lake Poso is included in the national priority lakes because it is a habitat for eel fish with high economic value, so its sustainability needs to be maintained. Changes in the environment in the water catchment area will affect the condition of the waters, it is necessary to evaluate the condition of the waters in the Poso watershed, as an eel migration area. The purpose of this study was to assess the water quality status of the Poso watershed using the Pollution Index and Carlson Trophic Status Index methods. The research was conducted in the Poso Watershed in June 2021 and January 2022. Pollution Index values in rivers in the Poso watershed range from 0.61 to 2.69 (good to slightly polluted), while Carlson Trophic Status Index values range from 14.37 to 33.00 (oligotrophic). The results of this research show that the water quality conditions in the Poso watershed are still good to support the life of the biota in it, such as eels, but water area conservation is needed to maintain its habitat.