A high-temperature mechanical dish machine is in use. At the dish surface, what is the minimum final-rinse water temperature for sanitization under the California Retail Food Code?

Explanation

California Retail Food Code HSC §114099.6(d) requires high-temperature mechanical warewashing to deliver a final rinse at a minimum of 180°F at the manifold (the supply line entering the machine) AND at least 160°F as measured at the surface of the items being sanitized — verified using an irreversible thermolabel or maximum-registering thermometer placed on a plate run through the machine. The 20-degree drop between manifold and dish surface accounts for heat loss as water sprays through the wash chamber. Option A (140°F) is the wash compartment temperature for some machines, not the sanitizing rinse. Option B alone is the dish-surface minimum but missing the manifold spec is incomplete; option C states both correctly. Option D (212°F, boiling) is unreachable in standard equipment and unnecessary. Each machine must have a temperature gauge, and many include a built-in booster heater. A low rinse temperature is a critical violation because thermal sanitization is verified by temperature alone — there is no chemical to test.