Large Distribution Meter Calibration FacilityThe key to water sustainability is the reduction of the difference between available supply and actually delivered water. Distribution system losses contribute significantly to the water sustainability problem. A low uncertainty large meter calibration facility specifically configured with the goal of accurate/reliable water audits and the subsequent implementation of early low level leak detection by mass / standard volume balance is proposed. Section 1 of the proposal is an "Introduction: Briefing for Water Policy Makers, Environmental and Legal Background" for this rigorous fundamental approach to effective water distribution system management . The voluminous full proposal with supporting documents is available on request.