It is analysis of economic feasibility of onsite grey water reuse in the urban sector giving RBC / RMBR based systems. It is the proposed technology for the safe use of waste water, excreta and grey water as per guidelines of World Health Organization. It is related with energy efficiency which helps for LEED rating for Green Building. To provide solution related with water as per guidelines World Health Organization (WHO) To generate plant as per guidelines of World Health Organization for Environrnertal having following features:-