Why do communities ask residents to separate recyclable materials from garbage?

Communities ask residents to separate recyclable materials from garbage—a process known as source separation—primarily to improve the quality of recovered materials and ensure the efficiency of recycling operations.1

When recyclables are mixed with moist garbage or broken glass, they become contaminated, which significantly lowers the quality of the materials recovered at centralized processing plants. By having citizens sort refuse into specific categories—such as paper, metals, glass, and plastics—before collection, municipalities ensure that these materials remain clean and easier to process at a material recycling facility.1

Beyond processing quality, source separation is a vital component of broader waste management strategies. It helps reduce the volume of waste sent to landfills, which is increasingly expensive and environmentally taxing. By facilitating the recovery of materials, communities can substitute recycled goods for raw resources, thereby mitigating the pollution and environmental degradation associated with waste disposal and the extraction of new materials. While source separation can be more costly for municipal collection services than ordinary refuse collection, it remains the recognized best practice for effective resource recovery.21