ABSTRACT Desa Banglas Barat, Kabupaten Kepulauan Meranti is one of the villages that have clean water problems when the dry season arrives. This is because the availability of raw water that can be used by the community only comes from rainwater. Geological conditions in Desa Banglas Barat with a pH ranging from 3.1-4.0 and high acidity cause the condition of groundwater to be unfit for consum…