In December 2018, San Francisco passed an ordinance requiring the city's largest waste generators to conduct waste audits every three years. The goal is to increase compliance, reduce materials going to the landfill, help cut waste costs and move the city towards its "zero waste." A waste audit is a survey of waste streams. It involves going through bags of waste and sorting items to identify what is being thrown away, what is being recycled or diverted through other means and the amounts of each type by weight or volume. Waste audits can help businesses be in compliance, avoid fines and improve operations. Waste audits can help uncover missing revenue streams, help businesses verify and achieve more accurate data, measure success, and meet certification standards.

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