What are critical limits and how are they set?

Date modified: 22nd September 2025 | This FAQ page has been written by Pilla Founder, Liam Jones, click to email Liam directly, he reads every email.

Critical limits are specific thresholds that must be met to ensure food safety during production. These limits are set based on scientific research and are expressed as numerical values, such as temperatures or time limits. For example, cooking poultry to a minimum internal temperature is a critical limit that prevents harmful bacteria from surviving.

Common misunderstanding: Critical limits are just guidelines and can be adjusted based on experience.

Critical limits are not flexible guidelines; they are strict thresholds that must be adhered to. Adjusting these without proper scientific backing can lead to unsafe food that may harm consumers.

Common misunderstanding: Critical limits are the same for all types of food businesses.

Each food business may have different critical limits depending on the specific food items they handle. It’s important to develop limits that are tailored to the particular risks associated with your food products.

Why must food businesses meet critical limits in HACCP?

Meeting critical limits in HACCP is essential to prevent foodborne illnesses and ensure food safety. These limits are designed to control specific hazards that could lead to serious health risks if not properly managed. Failing to meet these limits can result in contaminated food, which can harm customers and damage a business’s reputation.

Common misunderstanding: Meeting critical limits occasionally is sufficient to maintain food safety.

Consistency in meeting critical limits is crucial. Occasional compliance is not enough as it leaves room for safety breaches that could lead to illness or even legal consequences.

Common misunderstanding: Critical limits are only about temperature control.

While temperature control is a significant aspect, critical limits also include other factors such as pH levels, salinity, and moisture content, depending on the food and process involved.

What are examples of critical limits in hospitality settings?

In hospitality, critical limits can include cooking temperatures, such as ensuring poultry reaches at least 74°C, or cooling times, like cooling cooked food from 60°C to 20°C within two hours. Other examples might be the chlorine level in water used for washing vegetables or the time limits for holding food at safe temperatures.

Common misunderstanding: All critical limits involve high temperatures.

Some critical limits involve maintaining low temperatures, such as keeping cold foods at or below 8°C to inhibit bacterial growth.

Common misunderstanding: Critical limits are only for cooking and cooling.

Critical limits also apply to other stages like storage, where specific humidity or light exposure levels must be controlled to ensure food safety.

UK Official Guidance

USA Official Guidance

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How does a HACCP system help prevent food contamination?

A HACCP system identifies potential food safety issues and implements preventative measures to avoid problems before they start, significantly reducing the risk of food contamination and ensuring customer safety.

What are critical control points (CCPs) in a HACCP system?

In a Hazard Analysis and Critical Control Points (HACCP) system, critical control points (CCPs) are stages where control is crucial to prevent, reduce, or eliminate a food safety hazard to an acceptable level. Cooking, for instance, is a CCP because it is essential to cook food to the correct temperature to eliminate harmful bacteria. It is important to identify these points to ensure food safety effectively.

What is the origin of HACCP and how is it used today?

HACCP, which stands for Hazard Analysis and Critical Control Point, was created in the 1960s by the Pillsbury Company alongside NASA. Its initial purpose was to secure food safety for space missions.

What is the difference between a HACCP plan and a Food Safety Management System?

A HACCP plan specifically focuses on identifying and controlling critical points in the food production process to prevent safety hazards.

What does conducting a hazard analysis involve in HACCP?

Conducting a hazard analysis in HACCP involves identifying potential food safety risks at each step of the food production and handling processes.

What should food businesses do when a critical limit is not met?

When a critical limit in a HACCP plan is breached, food businesses must immediately take corrective actions.

Why must a HACCP plan be validated and reviewed regularly?

Regular validation and review of a HACCP plan are crucial to ensure the effectiveness and relevance of food safety measures.

What records must be kept under a HACCP plan?

A HACCP plan requires keeping comprehensive records to prove the effectiveness of your food safety processes and compliance with safety standards.

What is involved in monitoring critical control points?

Monitoring critical control points (CCPs) is crucial in the HACCP system to ensure food safety.

What is the role of a HACCP team in food businesses?

In food businesses, a HACCP team is vital for ensuring food safety. This team is tasked with developing, implementing, and maintaining the HACCP system.

How can HACCP be built into overall quality assurance?

Integrating HACCP into overall quality assurance involves making it an integral part of daily operations to ensure that food safety drives quality across all food services.