A method of creating a sanitation level model with respect to a predefined microorganism in food processing equipment is provided. The method includes generally three steps. First, a temperature history during a use cycle of the food processing equipment is created. The temperature history includes a collection of a plurality of temperatures that the food processing equipment undergoes during the use cycle. The use cycle includes a normal use stage, a sanitizing stage, and perhaps an idle stage. Second, a growth model of the microorganism is continuously applied to each applicable temperature in the temperature history. Third, a death model of the microorganism is continuously applied to each applicable temperature in the temperature history. The created sanitation level model is used to ascertain the microorganism growth/death rate in the food processing equipment during the use cycle.