This paper explores for an impact based framework in determining the sustainable waste management strategy for local authority level. Application of Life Cycle Assessment (LCA) based framework predicted the potential negative and positive impacts of each stage of waste management process and compared different future scenarios to identify the integrated SWM strategy. Low-cost and land availability-based waste management methods are known to be ineffective and impact-based sustainable solid waste management (SWM) strategies are limited in the local authorities of Sri Lanka. A frequent debate was seen between incineration and sanitary landfilling as the final disposal method as opinion surveys and cost based approaches have limited focus on scientific evaluation of impacts. This study used Emission Quantification Tool (EQT) to calculate the impacts of waste management process with five (05) future scenarios of waste integration including the Business-As-Usual scenario. Expert opinion survey was conducted in validation the outcomes and prioritization of scenarios. The selected local authority was Dehiwala-Mount Lavinia Municipal Council (DMMC) as the case study. The results were obtained by considering the CO 2 emissions equivalent for one ton of solid waste where BAU scenario had the highest negative impacts with open dumping as the current practice of end disposal. Incineration method as the main disposal method had highest positive impacts while sanitary landfilling at Aruwakkalu (200km away from the source) had moderate positive impacts mainly due to the emissions caused by the transportation and processing. Recycling and Anaerobic Digestion (AD) was considered priority steps to improve the positive impacts of the waste management process. EQT model can be used to compare future scenarios to support decision makers on effective integration of waste management techniques. The study revealed that emissions during transportation and open burning are significant, yet considered less in selecting waste management process. This study can be further developed to compare scientific evaluation methods with financial and resource based criteria to make decisions on SWM.