PENENTUAN PARAMETER KUNCI KUALITAS AIR SUNGAI BEDADUNG KABUPATEN JEMBER MENGGUNAKAN WATER QUALITY INDEX (Key determination of water quality parameter in Bedadung River, Jember Regency using water quality index method)

Determinion function of key parameters of water quality representing many parameters can be used to determine the water quality status . The purpose of the study were to analyse water quality status using Water Quality Index from Ministry of Environment of Mongolia and to select key parameter of water quality with discriminant analysis at Bedadung River. This research used 25 parameters (physicochemical and microbiology) were taken from 5 water sampling location at the period of 2016 to 2019. Location of water quality sampling were in urban area i.e. Patrang, Sumbesari, and Kaliwates Sub-district. The results showed that the water quality status calculation of the Bedadung River in urban area segment was 0.70 - 2.00 in clean and lightly - moderately polluted category. The key parameters from discriminant analysis were TSS, cobalt, sulfide, and chlorine. The most polluted parameters were sulfide and chlorine. The source of chlorine and sulfide pollution in Bedadung River were solid waste domestic exposure. Recommendation to reduce the level of contamination caused by garbage is development of small dam to facilitate the cleaning of garbage on the current season drought and education of the public to not throw garbage or waste in the Bedadung River.