Analysis of the water quality at Cipeusing river, Indonesia using the pollution index method

River pollution is still a problem in most countries, especially in developing countries, such as Indonesia. Several methods have been used to reduce the level of pollution across these water sources. In West Java Indonesia, Cipeusing is one of the highest polluted rivers that need analysis of pollution index to produce a value for indicat-ing the relative pollution levels of the water quality standard.The study was conducted between 2016 and 2017 at the Cipeusing River, to assess it's pollution levels using the Pollution Index (PI) method. The results showed that the water pollution changed from 2016 to 2017. In terms of physical, chemical and microbiological analysis using the PI method in 2016, Cipeusing River gave a value of 5.05-7.07 (moderately polluted), and in 2017, this value was 15.65-17.65 (severelly polluted). The highest pollution index was at the downstream area of the river. Thus, efforts are needed in order to control the water pollution levels at the Cipeusing River.(c) 2020 Ecological Society of China. Published by Elsevier B.V. All rights reserved.