Postharvest water uses must have no detectable generic E. coli per 100 mL for which usage?

• A. Direct contact with covered produce during or after harvest
• B. Direct contact with food contact surfaces
• C. To make ice
• D. All of the above

Answer: (D)

The main idea is that water quality used in postharvest handling must be free of fecal contamination when it will contact edible portions or the surfaces that contact them, including ice. E. coli is a common indicator of fecal contamination, so if any is detected per 100 mL, it signals possible presence of pathogens and a risk to food safety.

Direct contact with produce during or after harvest involves water touching the edible surface; even small amounts of contamination can transfer microbes to the produce, so zero detectable generic E. coli per 100 mL is required.

Direct contact with food-contact surfaces is also critical because those surfaces transfer microbes to the product during processing; keeping that water free of E. coli prevents cross-contamination.

Water used to make ice is particularly important because the ice directly contacts the product and can spread contaminants as it melts; any detectable E. coli in the ice water would risk contaminating the produce.

Therefore, for all these postharvest uses—water that touches produce, water that contacts food-contact surfaces, and water used to make ice—the standard is no detectable generic E. coli per 100 mL.