Food Safety Management Systems: How to Build and Audit a HACCP Plan from Scratch

A Hazard Analysis and Critical Control Point (HACCP) plan remains one of the most essential tools for ensuring food safety in any food manufacturing, processing, or handling environment. Whether you are operating a small food business or a large industrial plant, HACCP provides a structured, internationally accepted system for identifying, evaluating, and controlling food safety hazards.

Building a HACCP plan from scratch may seem complex, but with a clear understanding of the principles, proper documentation, and systematic verification, any food business can implement an effective and auditable plan. This article provides a practical, step-by-step approach to develop and audit a HACCP system aligned with global standards such as Codex Alimentarius , the Food Safety Modernization Act (FSMA) , and ISO 22000 .

Understanding the Purpose of HACCP HACCP is a preventive system, not a reactive one. Its goal is to identify potential hazards before they occur and design controls to eliminate or minimize those hazards to acceptable levels.

International guidance on HACCP comes from the Codex Alimentarius Commission: Codex HACCP Guidelines

HACCP focuses on three main hazard categories :

Biological hazards – bacteria, viruses, parasites

Chemical hazards – allergens, cleaning chemicals, residues, heavy metals

Physical hazards – glass, metal, stones, foreign objects

The 12 Steps of HACCP (Codex Framework) Assemble the HACCP Team A HACCP team should include individuals with practical and technical knowledge of:

Production processes

Food microbiology

Quality control

Engineering or maintenance (if relevant)

For guidance on team roles: ISO 22000 Food Safety Management

Describe the Product Document important details, including:

Raw materials

Processing steps

Packaging type

Shelf life

Storage conditions

Intended use

Identify Intended Use Consider how consumers will handle the product:

Ready-to-eat?

Requires cooking?

Target group (general public, infants, hospitals)?

Construct the Process Flow Diagram Create a flow diagram from receiving to distribution. This diagram must be precise and easy to follow.

On-Site Verification of the Flow Diagram Walk through the entire operation and confirm that every step is accurately represented. Any omissions or misalignments must be corrected.

HACCP Principle 1: Conduct a Hazard Analysis At each step in the process, identify potential hazards and determine:

Likelihood of occurrence

Severity of impact

Preventive measures that must be implemented

Codex hazard analysis resources: Codex General Principles of Food Hygiene

HACCP Principle 2: Determine Critical Control Points (CCPs) A CCP is a step where control is essential to prevent or eliminate a food safety hazard. Common CCPs include:

Thermal processing

Cooling

Metal detection

pH control

Allergen cross-contact prevention

Tools such as a CCP decision tree help determine whether a step qualifies as a CCP.

HACCP Principle 3: Establish Critical Limits A critical limit is the minimum or maximum value that must be met to ensure safety. Examples:

Cooking chicken to ≥ 74°C

Metal detector sensitivity of 2.0 mm ferrous

pH < 4.6 for shelf-stable acidified foods

Reference: USDA Safe Minimum Cooking Temperatures

HACCP Principle 4: Establish Monitoring Procedures Monitoring ensures that CCPs stay within critical limits. Monitoring can be:

Continuous (e.g., automated temperature logging)

Scheduled (e.g., hourly checks)

Monitoring must be documented and assigned to trained personnel.

HACCP Principle 5: Establish Corrective Actions Corrective actions must state:

What to do when control is lost

Who is responsible

What happens to the affected product (hold, rework, discard)

Corrective actions must also be recorded.

HACCP Principle 6: Verification Procedures Verification ensures your HACCP plan works as intended. Examples include:

Internal audits

Product testing

Environmental swabbing

Equipment calibration

Record review

Detailed verification guidance: FDA FSMA Preventive Controls Rule

HACCP Principle 7: Documentation and Record Keeping Essential documents include:

CCP monitoring logs

Training records

SOPs and SSOPs

Calibration certificates

Corrective action reports

Audit reports

A well-kept documentation system is crucial for certification and regulatory inspection.

How to Audit a HACCP Plan Auditing ensures that the system is functioning effectively. Audits may be:

Internal (first-party)

Customer audits (second-party)

Certification audits such as FSSC 22000 or BRCGS (third-party)

Pre-Audit Preparation Review previous audit reports

Check updated regulations

Assess new products or processes

On-Site Evaluation Auditors will inspect:

CCP monitoring activities

Employee hygiene

Calibration logs

Cleaning and sanitation

Allergen controls

Process flow and CCP validity

Interviews and Observations Auditors will speak with staff to confirm:

CCP knowledge

Food safety practices

Understanding of corrective actions

Report Findings Audit results will include:

Non-conformities

Observations

Opportunities for improvement

Corrective action responses and timelines must be defined clearly.

Conclusion Building and auditing a HACCP plan may appear daunting, but when approached step-by-step, it creates a strong foundation for preventing food safety hazards. When properly implemented, a HACCP system protects consumers, strengthens regulatory compliance, improves export readiness, and boosts customer confidence. For a food operation of any size, a well-designed HACCP plan is not only a regulatory requirement—it is an investment in long-term success.

References Codex Alimentarius Commission. (2023). Hazard Analysis and Critical Control Point (HACCP) System. https://www.fao.org/fao-who-codexstandards/haccp/en/

Codex Alimentarius Commission. (2023). General Principles of Food Hygiene. https://www.fao.org/fao-who-codexstandards/

Food and Drug Administration. (2023). Food Safety Modernization Act (FSMA). https://www.fda.gov/food/food-safety-modernization-act-fsma

United States Department of Agriculture. (2023). Safe Minimum Cooking Temperatures. https://www.foodsafety.gov/food-safety-charts/safe-minimum-cooking-temperature