san francisco has collected more than a million tons of food scraps yard trimmings and other compostable materials and turned it into compost that is used by local fanners and wineries in napa and sonoma counties san francisco diverted nearly diversion in the highest rate of any major us city source epa zero waste case shidy san francisco ca wwwepagovtransfomiingwastetoollesswastccascstudvsaiifranciscoca as identified by the jica roadmap study a comprehensive study and formulation of a masterplan for solid waste management at the metropolitan scale needs to be prioritised the proposed mcda bill makes provision for the establishment of public commissions of which solid waste management is included