This case study was carried out with the overall objective to expose a strategic wastewater management system for the coastal area of the municipality of Kumburgaz, located in a sensitive rural area in Istanbul. The sewage in Kumburgaz is collected with a separate system. The existing network was constructed about 20 years ago. The collected wastewater is discharged into the sea from 7 different points without any treatment causing pollution at the shoreline and that is harmful for the tourist destination character of the city. The city might loose this status if the necessary precautions are not taken. The present situation was investigated in this study and treatment alternatives for Kumburgaz were discussed with respect to the operation and maintenance. The cost analysis was also performed showing that the connection of the Kumburgaz sewage to the existing pre-treatment system in Buyukcekmece (Istanbul Water and Sewerage Administration - ISKI) and deep-sea discharge would be the better alternative.