<![CDATA[This Lake Sentani in Papua Province has significant ecological and economic value and is a source of life for the local community. However, intensive anthropogenic activities around the lake result in a decline in water quality that threatens the ecosystem and public health. This study aims to examine the water quality status of Lake Sentani using the British Columbia Water Quality Index (BC-WQI) method, which is able to integrate various physical, chemical, and biological parameters into one quality index that is easy to interpret. Data collection was carried out at three location points in the upstream, middle, and downstream parts of Lake Sentani, with in situ and ex situ testing for ten water quality parameters such as TDS, pH, BOD, COD, heavy metals Pb, oils and fats, and total coliforms. The calculation of the water quality index uses the values of F1 (scope), F2 (frequency), and F3 (amplitude) to determine the BC-WQI. The results showed that at station 1 (Ifale) the BC-WQI value was 37.62 (good quality), at station 2 (Asei) it was 49.92 (poor quality), and at station 3 (Jaifuri) it was 67.69 (poor quality). Thus, the water quality downstream of the lake is classified as unsafe for consumption or clean water without adequate treatment. This study shows the importance of integrated management and efforts to preserve water quality to maintain the sustainability of Lake Sentani.]]>
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