Claude Bernard (1813-1878) Abstract Entombed waste in current sanitary landfills will generate biogas and leachate when physical barriers fail in the future allowing the intrusion of moisture into the waste mass contradicting the precepts of the sustainability concept. Bioreactor landfills are suggested as a sustainable option to achieve Final Storage Quality (FSQ) status of waste residues; however, it is not clear what characteristics the residues should have in order to stop operation and aftercare monitoring schemes. An experiment was conducted to determine the feasibility to achieve FSQ status (WAC of the European Landfill Directive) of residues in a pilot scale bioreactor landfill. The results of the leaching test were very encouraging due to their proximity to achieve the proposed stringent FSQ criterion after two years of operation. Furthermore, residues have the same characteristics of alternative waste stabilisation parameters (low BMP, BOD/COD ratio, VS content, SO42-/Cl-ratio) established by others researchers. Mass balances showed that the bioreactor Published in Waste Management as: Achieving “Final Storage Quality” of municipal solid waste in pilot-scale bioreactor landfills. Valencia R., van der Zon W., Woelders H., Lubberding H.J., Gijzen H.J. (2008) in press.