Permasalahan Kualitas Airtanah Di Daerah Bagian Utara Pulau Bengkalis, Riau

Abstract

Groundwater quality become an important issue due to increasing of anthropogenic activities. Development of an area that followed by population growth impacting not only quantity but also the quality of groundwater. Coastal area of northern Bengkalis Island also facing the water problem. The excessive used of water resources causing the depletion of groundwater quality. Seawater intrusion is a common hassle that can be found along the coastal area of Bengkalis Island. Higher coastal erosion rate lead to shoreline retreat that affecting the subsurface freshwater-seawater interface. Geological condition of study area that dominated by peat soil layer also bring an impact to groundwater quality. Groundwater monitoring had been conduct to map the water quality zone. Existing dug wells had been measured to obtain several in-situ parameters. The field data then being assess to acquire the important information of recent groundwater condition of the study area by comparing to water quality standards such as Indonesian Ministry of Health Drinking Water Standard 2010 and WHO Drinking Water Standard 2017. Brackish water had been detected in several wells and river section in the northern part of study area. The brackish water shows higher TDS value compared to freshwater. In the southern part, the brownish water had been found in the several wells that lied on the peat land. In general, groundwater quality in study area has several problems that needs to be resolved. Advance study need to be carried out to ensure the impact of recent groundwater quality and to find the appropriate remediation program.