IJSRSET196323 | Received : 15 May 2019 | Accepted : 15 June 2019 | March-April -2019 [ 6 (3) : 267-274 ] © 2019 IJSRSET | Volume 6 | Issue 3 | Print ISSN: 2395-1990 | Online ISSN : 2394-4099 Themed Section : Engineering and Technology DOI : https://doi.org/10.32628/IJSRSET196323 267 Determination of Water Quality Status at Belawan Harbour Using STORET Method Yuni Yolanda *1 , Hefni Effendi 2 , Bagus Sartono 3 * 1 Department of Natural Resource and Environmental Management, IPB University, Bogor, Indonesia 2 Environmental Research Center , IPB University, Bogor, Indonesia 3 Department of Statistics IPB University, Bogor, Indonesia ABSTRACT The operation and development of the harbour is closely related to pollutant sources in the waters, especially the waters of the Belawan Harbour in Medan. This study aims to assess the status of water quality and determine the index of pollution in the waters. The data used in this study are water quality data from the Medan Harbour's environmental management monitoring and reharbouring book in 4 (four) years during 2015 to 2018. Methods for determining the level of water quality status using the STORET method (Water Quality Data Retention and Retrieval System) and compared to the quality standards of Environmental Decree from Republic Indonesia Number 51 of 2004. Based on the analysis of the testing of 14 seawater sampling points around the waters of harbour, results of measurements of seawater quality in physics, chemistry and biology were varied. The level of pollution of the waters of Belawan Harbour shows the results of analysis that the waters of the Belawan Harbour are in the moderate polluting class with a value of -12 to -19, while 1 (one) station is in the light polluted class with a value of -10. Keywords : Harbour Management, STORET, Water Quality I. INTRODUCTION Harbour of Belawan is the third largest (three) harbour in Indonesia after Tanjung Priok and Tanjung Perak Harbours in Surabaya. The geographical position of Belawan harbour is in the estuary of 2 (two) large rivers, namely the Belawan River and Deli River with coordinates 03º 47 '00 "LU and 98" 42 "BT, besides that it faces the Malacca Strait has a high potential as an operation center and regional economic development in particular. Development and operation activities such as the construction of docks, caused changes in sediment trans harbour and pollution due to contaminant inputs from several polluted sources such as industrial activities around the harbour, liquid waste, domestic liquid waste, and the like and the use of antifouling paint as hull liners NRC (1997 ) Among the various activities, repairing and repainting ships and cruise ships around the harbour is a very dangerous activity Pourabadehei and Mulligan CN (2016). Over the years antifouling paint has been applied to the hull of the ship to protect ships from living organisms that are attached Turner (2010). Other anthropogenic activities in harbour areas such as maritime, residential and maritime tourism and the development of aquaculture and fisheries. These activities will certainly affect the quality of the coastal region. A very dominant problem for coastal, coastal and marine areas is the occurrence of