Abstract: Organic matter is an important chemical parameter to check the stability and maturity of compost prepared by municipal solid waste. This study was designed to determine the percentage of organic matter that must be below 30% after 3 months of composting process. The higher value of organic matter indicates the less stable and immature compost. The organic waste was treated with inoculum and it was concluded that the windrows give stable and mature compost in terms of organic matter analysis because the results showed the organic matter content 30 and below in all windrows.