Peat water is surface water that is abundant in swampy and lowland areas, especially in the Pekanbaru and surrounding areas. The purpose of the research is to treat peat water into clean water in accordance with the Ministry of Health No. 416 / MENKES / PER / IX / 1990 by using a mixture of alum coagulant and lime. The variation used in this study was 1 (alum 1%: lime 1%), variation 2 (alum 1%…