HACCP (Hazard Analysis and Critical Control Points) is a systematic approach to food safety that identifies where things can go wrong during food production and puts controls in place to prevent contamination before it happens. Rather than relying on testing finished products, HACCP focuses on prevention at every stage, from raw ingredients to the final packaged item. It is built on seven core principles and is legally required for certain food categories in the United States, including seafood and juice.
Where HACCP Came From
The HACCP concept was developed in the 1960s when NASA needed to guarantee safe food for astronauts. Food that crumbled could damage equipment in zero gravity, and foodborne illness in orbit would be catastrophic. NASA partnered with the Pillsbury Company, drawing on methods the U.S. Army’s Natick Research Center had used to ensure the quality of medical supplies. Pillsbury adapted those methods specifically for food production, creating what became the HACCP framework. It was the first time the food industry had a structured system for monitoring and measuring pathogen risks rather than simply inspecting finished products.
The Three Types of Hazards
Every HACCP plan starts by looking at three categories of hazard that could make food unsafe.
Biological hazards include bacteria like Salmonella, E. coli, and Listeria, as well as viruses such as norovirus and hepatitis A, and parasites. These are the hazards most people think of when they hear “food safety.”
Chemical hazards cover a wide range: pesticide residues, heavy metals (lead, mercury, arsenic), veterinary drug residues in animal products, environmental contaminants like dioxins, mold-produced toxins such as aflatoxin, and the major food allergens (milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, and soybeans).
Physical hazards are foreign objects that could injure someone, such as fragments of metal, glass, or hard plastic that enter food during processing.
The Seven Principles
HACCP is organized around seven principles that a food business works through in order. Together, they form a complete loop of prevention, monitoring, and correction.
1. Conduct a Hazard Analysis
The team reviews every ingredient, every processing step, all equipment used, and how the finished product will be stored, distributed, and consumed. From that review, they build a list of every biological, chemical, and physical hazard that could be introduced or increased at each step. Then they evaluate each hazard by severity and likelihood. Only hazards significant enough to cause illness or injury if left uncontrolled move forward into the plan.
2. Determine Critical Control Points
A critical control point (CCP) is a specific step where you can apply a control that is essential to preventing, eliminating, or reducing a hazard to a safe level. Not every step in production qualifies. A CCP is only designated when failing to control it would mean the hazard has no other opportunity to be caught. For example, cooking chicken to a specific internal temperature is a CCP because that is the step that kills harmful bacteria. Teams typically use a decision tree, a series of yes/no questions, to work through whether each step truly qualifies.
3. Establish Critical Limits
Each CCP gets a measurable boundary that separates safe from unsafe. A critical limit might be a minimum cooking temperature, a maximum time a product can sit at room temperature, or a specific pH level. These are hard lines: if a product falls outside the limit, it is treated as potentially unsafe.
4. Establish Monitoring Procedures
Monitoring is the planned schedule of observations or measurements that confirms each CCP stays within its critical limits. This could mean checking a thermometer at set intervals, timing a pasteurization cycle, or testing the acidity of a batch. Monitoring also creates a written record that can be reviewed later.
5. Establish Corrective Actions
When monitoring reveals that a CCP has drifted outside its critical limit, the plan spells out exactly what happens next. Corrective actions have three parts: find and fix the cause of the problem, decide what to do with any product that was affected (hold it, reprocess it, or dispose of it), and document everything that was done.
6. Establish Verification Procedures
Verification confirms that the entire system is actually working as designed. This is different from monitoring. Monitoring watches individual CCPs in real time; verification steps back and asks whether the whole plan is effective over time. It can include reviewing monitoring records, calibrating instruments, or conducting periodic testing of finished products. The Codex Alimentarius, the international food standards body, now also requires that CCPs be formally validated, meaning the business must demonstrate with evidence that the controls it chose can actually eliminate or reduce the identified hazards under real operating conditions.
7. Establish Record-Keeping Procedures
Every element of the system must be documented: the hazard analysis, the reasoning behind each CCP, the critical limits, all monitoring logs, corrective action reports, and verification activities. These records serve as proof during audits and inspections that the plan exists and is being followed. They also create a traceable history if something goes wrong.
Where HACCP Is Legally Required
In the United States, HACCP is mandatory for three food categories. The FDA requires it for seafood processing and for juice production. The USDA requires it for meat and poultry processing. For other food categories, the FDA’s current framework centers on a related but updated approach called Preventive Controls, which shares HACCP’s core logic but adds requirements around supply chain verification and allergen controls.
Internationally, HACCP principles are embedded in the Codex Alimentarius General Principles of Food Hygiene (CXC 1-1969), which most countries reference in their own food safety laws. The Codex revised these principles in 2022, adding new obligations around food safety culture, expanded training requirements, and stronger allergen management. Major global food safety certification standards, including those recognized by the Global Food Safety Initiative, have updated their requirements to align with these changes.
How HACCP Differs From Traditional Inspection
Before HACCP, food safety relied heavily on end-product testing: pull samples from a finished batch, send them to a lab, and hope the results come back clean. The fundamental problem is that testing a handful of samples from thousands of units can easily miss contamination. HACCP flips this model. Instead of checking whether the final product is safe, it controls the process so that unsafe product is far less likely to be produced in the first place. When a CCP goes out of control, the system catches it immediately, not days later in a lab report.
This prevention-first approach is why HACCP became the global standard. It reduces reliance on luck and sampling statistics and replaces them with continuous, documented control at the points where hazards actually enter or grow in food.
Putting a HACCP Plan Together
Before applying the seven principles, a business completes several preliminary tasks. It assembles a HACCP team with people who understand the product, the process, and food safety science. The team writes a full description of the product, including its ingredients, processing methods, packaging, storage conditions, shelf life, and intended consumers. They then build a flow diagram that maps every step from receiving raw materials through shipping the finished product. Finally, the team walks the production floor to verify that the flow diagram matches what actually happens.
Once the plan is written and implemented, it is not a static document. Any time a business changes an ingredient, a supplier, equipment, packaging, or distribution method, the HACCP plan needs to be reassessed to determine whether the hazard analysis and CCPs still hold. Regulatory agencies expect to see evidence of these reassessments during inspections.