Under RCRA, how long may a large quantity generator store hazardous waste on-site?

• A. 180 days
• B. 365 days
• C. 60 days
• D. 90 days

Answer: (D)

The main idea here is how long hazardous waste can be kept on-site by the generator category. For a large quantity generator, the on-site accumulation time is limited to ninety days. That means after the waste is generated, it must be moved off-site to a treatment facility or to a permitted disposal facility within that ninety-day window, while being stored in compliant containers or tanks and with proper date-marking and inspections. This relatively short period helps minimize the risk of leaks, spills, or other releases by ensuring waste is promptly treated or disposed of. The other timeframes apply to different generator categories: smaller generators can accumulate longer (typically up to one hundred eighty days, with possible extensions if the waste will travel a long distance to a facility).