GROUNDWATER QUANTITY AND QUALITY MONITORING OF NORTH JAKARTA CITY, INDONESIA

Jakarta City as capital of Indonesia and its surroundings are an area of very dense and growing rapidly. Settlements are usually causes a decrease in the quality and quantity of groundwater, especially our research area on the northern Jakarta which is near Java sea. Therefore, studies were performed to monitor the water quantity and quality in the North Jakarta. The research method used is mixed method, field observation and secondary data. Monitoring groundwater level is by measuring and observing the condition of wells drilled and dug wells, as well as aspects of the local environment. Samples were taken from 33 drilled and dug wells to determine the condition of the quality and quantity of groundwater. Water quality such as pH, electrical conductivity, total dissolved solids and major element have been monitored by refers to the Decree of the Minister of Health of Indonesian Republic No. 907/Menkes/SK/VII/2002 and also annual monitoring from 2009 to 2014 of water quantity such as groundwater level aspects is done periodically in order to determine changes in the groundwater fluctuation. Groundwater quality measurement results obtained electrical conductivity value of 8.95 to 17,364 μS, value of TDS 224 - 13528 mg/L, PH value of 6.25 - 8.78, there are 24 locations that contain of Fe more than 0.3 mg/L, 18 locations with manganese more than 0.1 mg/L, 26 locations with Na over 200 mg/L, 18 locations with chloride more than 250 mg/L, 5 locations with sulfate more than 250 mg/L, 8 locations with ammonia over 1.5 mg/L. These sites have chemical compositions that exceed the safety standards of water from the Ministry of Health of the Republic of Indonesia. Overall observations of groundwater quantity in northern Jakarta, generally increased with depth of groundwater conditions are very diverse ranging from 1.7 to 47.46 meters below the ground surface at 2014. From analysis of groundwater flow patterns, in 2014 patterns is greatly increased cone that cause unstable groundwater flow in the area of investigation and even became one of the causes of environmental damage such as floods and subsidence and spread more widely.