Environmental Quality Identification of Wangi the River Polluted by Waste Based on the Environmental Pollution Index

High amount of wastewater release to Wangi riverflow, especially industrial wastewater, can potentially cause pollution. Pollution in river has been occurred since 2015. The aim of this study was to identify the environmental quality of contaminated Wangi River and determine the pollution index. This study was performed through a survey method, and river water sampling was carried out around the Wangi riverflow, Beujeng-Beji, Pasuruan District. Sampling was conducted in three locations, namely industrial, residential, and agricultural areas on different months (June 2020 - July 2021). This study was also conducted to analyze the heavy metal content of Pb, Hg and Cd in Wangi river biota around the watershed, namely mosquito fish (Gambusia affinis). The pollutant identification result was based onthree study areas, namely study area I (factory/industrial waste), study area II (residential waste) and study area III (agricultural waste). Heavy metal contamination occurred in Wangi River hhe as the potential to produce waste containing Pb, Cd and Hg. The average levels of Pb, Cd and Hg in the water were 0.031 ppm, 0.019 and 0.009 ppm, respectively. These values exceeded the acceptable quality standard. The result of data analysis based on the pollution index (PI) and average number of pollution indexes (PIaverage) in the Wangi river (at study areas I, II and III) was 5.503, which means thatthe condition of the Wangi river is classified as a "moderately-polluted"river. The authority is expected to develop a further policy for Wangi riverflow preservation program.