Which of the following is an example of an accepted composting method for produce?

• A. Vermicomposting with no heat
• B. Aerated static composting: aerobic, minimum 131°F (55°C) for 3 days, followed by curing
• C. Windrow composting with 131°F (55°C) for 3 days
• D. Anaerobic digestion at 90°F

Answer: (B)

Pathogen reduction in composting comes from driving the pile into a thermophilic, aerobic phase and then letting it mature. The best-supported approach is an aerated static pile that is actively heated to at least 131°F (55°C) for a minimum of three days with continuous aeration, followed by a curing period. That thermophilic window rapidly inactivates harmful microbes, and the subsequent curing stabilizes the material so it’s safe and mature for use with produce.

Vermicomposting without heat doesn’t reliably reach the temperatures needed to inactivate pathogens. Anaerobic digestion at 90°F lacks the aerobic conditions and the high heat required, so it doesn’t meet the safety criteria for sanitizing produce-related compost. While windrow systems can reach high temperatures, the explicitly controlled aerated static method with a defined thermophilic phase and curing matches the standard practice for producing safe compost for produce.