What are the main types of hazardous waste lists under RCRA?

• A. A-listed wastes
• B. P- and U-listed wastes
• C. F-listed wastes, K-listed wastes, and P- and U-listed wastes
• D. K-listed wastes only

Answer: (C)

Hazardous waste listings under RCRA are organized into three main types: F-listed wastes, K-listed wastes, and P- and U-listed wastes. F-listed wastes come from non-specific sources, meaning wastes generated by a variety of processes or industries—think common solvents or process wastes that aren’t tied to a single industry. K-listed wastes are source-specific; they arise from particular industries or processes and reflect wastes typical of those activities. P- and U-listed wastes are discarded commercial chemical products; P-listed items are acutely hazardous, and U-listed items are hazardous chemicals that are regulated when discarded. Together, these categories make up the primary listing framework for RCRA hazardous wastes. Choosing only one type would omit other important waste sources, and focusing on just P- or U-listed wastes would miss the non-specific and source-specific listings.