U tilization of sludge, especially in the context of wastewater treatment plant installations, has become a significant concern as a way to address challenges arising from sludge management. Sludge, as a by-product of wastewater treatment processes, contains valuable organik materials and nutrients that can be reused beneficially. The purpose of this research is to determine the optimal stirring frequency and the optimal composition of sludge and corn cob powder in the composting process, carried out using the facultative composting method. Over a period of 45 days, variations were made in the stirring frequency: A (every 3 days), B (every 4 days), and C (every 5 days), as well as in the composition of raw materials - sludge with corn cob powder in the following proportions: 100% sludge, 75% sludge: 25% corn cob powder, 50% sludge: 50% corn cob powder, and 25% sludge: 75% corn cob powder. The best results were obtained in composting process B2 with a stirring frequency of every 4 days and a sludge composition of 75% with 25% corn cob powder. The analysis showed that the compost characteristics met the SNI 19-7030-2004 Compost Quality Standard for parameters such as temperature, moisture content, total nitrogen (N-Total), organik carbon, C/N ratio, and Escherichia coli bacteria count.