ABSTRACT Sabak Auh District, Siak Sri Indrapura Regency, with an area of 10,858 km2 and a population of 12,911 people. To meet their daily needs, the people of Sabak Auh use groundwater and rainwater. The soil conditions in this area have a high level of acidity and are peaty causing the ground water to become very turbid and brown in color which contains organic compounds. This situation make…