Critical Limit

A critical limit is a measurable maximum or minimum value that must be met at a critical control point (CCP) to prevent, eliminate or reduce a food-safety hazard to an acceptable level. Critical limits are established in a HACCP-based food-safety plan and must be based on applicable regulations, scientific evidence or validated process requirements.

Examples of critical limits

• Cooking: a specified internal temperature and, where required, holding time for a particular food.
• Cooling: maximum times and temperatures for moving cooked food through defined cooling stages.
• Cold holding: a maximum refrigerated temperature for foods requiring temperature control.
• Sanitizing: an approved chemical concentration, contact time or temperature for a specified method.

The correct value depends on the food, process, equipment and jurisdiction. A cooking limit for one food is not automatically appropriate for another.

Monitoring and corrective action

Staff monitor the critical limit using a suitable thermometer, timer, test strip or other calibrated instrument. Results are recorded as required. If a critical limit is not met, the operation must take corrective action: control the affected product, determine its safety, correct the process, document the deviation and address the cause so it does not recur.

Critical limit versus operating target

A critical limit is the safety boundary that must be met at a CCP. An operating target is often set more conservatively to provide a buffer and help staff stay within the critical limit.

Chef’s tip: Write critical limits in clear, measurable terms. “Cook thoroughly” is not a critical limit; a defined internal temperature and time from the approved food-safety plan is.

Key distinction: A critical limit is a measurable safety requirement at a CCP, not a general quality target or a preferred cooking temperature.