Porous asphalt has been commonly used to reduce pavement surface runoff, to collect stormwater, and to reduce pollution. The water that passes the porous asphalt will end up in reservoir, and hence, it is important to ensure that the water collected does not pollute the reservoir. This research aims to design and analyse the usage of porous pavement layer system, together with natural adsorbents, which were Zeolite and Granular Activated Carbon (GAC), and sponge materials to improve the collected rainwater quality in terms of pH, total dissolved solid (TDS) and electrical conductivity (EC) values. The rainwater collected from around West Jakarta area and it was acidic and had a low TDS and EC values. From the research results, all pavement layer variations were effective in improving the pH values. However, it was found that when using only a single layer below the porous asphalt layer, the usage of Zeolite or GAC was more effective than using just a sponge layer in reducing the TDS and EC values. It was also found that it is more effective to use the Zeolite on top of the GAC layer.