Water shortage and the rising cost of water services have been a problem of communities around the world for centuries. In 2019, the World Health Organization (WHO) had reported that around one out of ten, approximately eleven million people in the Philippines do not have access to improved water sources. Climate change is one of the main contributing factors to this problem. UNICEF stated that climate change disrupts weather patterns, leading to extreme weather events, unpredictable water availability, exacerbating water scarcity, and contaminating water supplies. Such impacts can drastically affect the quantity and quality of water needed to survive. Considering the occurrence of such abnormal phenomena, the aim of the study was to assess the quality of water sources in Metro Manila (NCR) and create an effective water filtration system that can be used to help reduce the contamination of water that Filipino households can utilize. The researchers gathered and analyzed data through comparative analysis, together with the support of similar studies, to help determine the optimal amount of components that will be used for the filter and establish if the filter is indeed effective in reducing contamination. The obtained results from the tests conducted for the seven water quality parameters tests between the Filtered Rainwater and Unfiltered Rainwater found that there was a reduction in the contaminants after the filtration of the rainwater using the filter prototype.