If you plan to sell a shelf-stable acidified or low-acid canned food, federal food process authority requirements say the scheduled process for that product has to be established by someone with expert knowledge in acidification or thermal processing before you can ship commercially.1eCFR. 21 CFR 114.83 – Establishing Scheduled Processes That single review then anchors everything else the FDA expects: facility registration, a formal process filing, a trained supervisor on the floor, and detailed records for every batch you produce.
Who Counts as a Process Authority
A process authority, sometimes called a competent processing authority, is a person or organization qualified to determine whether a food production method will keep dangerous microorganisms from growing. For acidified foods the regulation calls for “a qualified person who has expert knowledge acquired through appropriate training and experience in the acidification and processing of acidified foods.”1eCFR. 21 CFR 114.83 – Establishing Scheduled Processes For low-acid canned foods the standard is parallel: expert knowledge of thermal processing for low-acid foods in hermetically sealed containers, plus the lab facilities to run the necessary studies.2eCFR. 21 CFR Part 113 – Thermally Processed Low-Acid Foods Packaged in Hermetically Sealed Containers
Most process authorities are university-based food science programs, and several land-grant universities run dedicated labs that review formulations, run heat penetration tests, and issue the documents you’ll need. A smaller number of private consulting firms do the same work. The FDA does not maintain a certified list, so the choice is yours as the manufacturer. What matters is that the person or lab genuinely holds the scientific qualifications the regulation describes.
Which Products Need the Review
Two categories trigger the process authority requirement, and both have to be shelf-stable in sealed containers. If your product is sold refrigerated or frozen, these particular thermal processing rules don’t reach it.
Acidified Foods
Acidified foods are low-acid foods to which acids or acid foods have been added, so that the finished equilibrium pH is 4.6 or below and water activity stays above 0.85.3eCFR. 21 CFR Part 114 – Acidified Foods Pickled vegetables, shelf-stable salsas, and vinegar-based sauces are typical. The 4.6 threshold matters because it’s the boundary below which Clostridium botulinum spores cannot grow. The process authority reviews the recipe, confirms that pH is reliably achieved, and specifies any heat step needed to knock out spoilage or pathogenic organisms that can survive at that acidity.
Low-Acid Canned Foods
Low-acid canned foods finish above pH 4.6 with water activity above 0.85.2eCFR. 21 CFR Part 113 – Thermally Processed Low-Acid Foods Packaged in Hermetically Sealed Containers Canned beans, corn, soups, and meat products fall here. The pH is too high to control botulism on its own, so safety depends entirely on retort processing. The process authority sets the exact time, temperature, and pressure needed to achieve commercial sterility in the specific container and formulation you’re using.
Fermented Foods
Naturally fermented foods that finish at pH 4.6 or below are not covered by Part 113 or Part 114, because the acid was produced biologically rather than added.4U.S. Food and Drug Administration. LACF/AF Precursor Questions and Flow Traditional sauerkraut and kimchi fit this pattern. A voluntary filing is allowed but not required. If a fermented product finishes above pH 4.6 with water activity above 0.85, the low-acid canned food rules apply and a full review is required.
The Supervisor Training Requirement
Before production begins, at least one person supervising the operation has to have completed an FDA-approved course. For low-acid canned foods, retort operators, aseptic system operators, and container closure inspectors must work under a supervisor identified by an approved school as having completed the course.5eCFR. 21 CFR 113.10 – Personnel Acidified food operators face the same rule, covering food handling, plant sanitation, pH control, and critical acidification factors.6eCFR. 21 CFR 114.10 – Personnel
The course that meets this requirement is the Better Process Control School, offered through university food science programs since the 1970s. The acidified-only track runs about two days; the full course covering both acidified and low-acid canned foods takes roughly four days. Costs typically range from a few hundred to several hundred dollars depending on the school and whether you’re an in-state participant. It’s a one-time educational requirement under the current regulation, though many manufacturers refresh the training when processes change or new supervisors take over.
Documentation the Process Authority Needs
The review can’t move without detailed technical data, and incomplete submissions are the most common reason things stall. Pull this together before you contact a lab.
Full Formulation
Submit a complete recipe listing every ingredient by weight. Exact proportions matter, not approximations, because small shifts in acid or in the solid-to-liquid ratio can move equilibrium pH above 4.6. If your product uses more than one acid source, such as vinegar plus citric acid, list each separately with its concentration.
pH and Water Activity
Record the initial pH of raw ingredients and the final equilibrium pH of the finished product. For products with solid pieces in a brine, the standard protocol is to blend solids and liquid in the container ratio until you have a uniform paste, then measure. Water activity confirms whether the product sits within the 0.85 threshold. Use a calibrated meter, not test strips, and take readings during real trial production runs rather than estimating from the recipe.
Processing Parameters and Container
Document heating temperature, duration, and cooling method. Container type matters more than many producers expect. Glass jars, metal cans, and flexible pouches all conduct heat differently, which changes how long it takes to reach a lethal temperature at the coldest point inside. Record the sealing method, fill temperature, and headspace. If the product has chunks of vegetable or meat, measure the largest pieces, because bigger particulates slow heat transfer to the center.
Most university labs supply standardized forms for this. Fill them out from direct measurements. An error in fill weight or initial temperature can force the authority to reject the submission or make you repeat the trial run.
What the Review Produces
Once your documentation is in, the process authority evaluates whether the proposed manufacturing steps will reliably produce a safe product. For acidified foods, they confirm that acidification consistently drives equilibrium pH to 4.6 or below and that any heat step handles the organisms that can grow at that acidity.3eCFR. 21 CFR Part 114 – Acidified Foods For low-acid canned foods, the focus is whether the retort process delivers enough heat for long enough to sterilize the container’s slowest-heating point.
Some products need a heat penetration study, where the lab places temperature sensors inside containers during actual processing. This is almost always required for low-acid canned foods and for acidified products with large particulates or unusual container shapes. Fees vary by institution and product. Straightforward acidified reviews often start under $200, while heat penetration studies and complex low-acid products can run several hundred dollars or more per product and container size.
If the process is adequate, the authority issues a scheduled process document, often called a process letter. It specifies the exact formulation, time, temperature, and other critical factors that must be followed on every batch. This becomes the foundation for your FDA filing and your production records. Turnaround varies. Straightforward acidified reviews can take three to five weeks; complex low-acid products or backlogged labs can take two to three months.
Registering and Filing With the FDA
With the scheduled process in hand, two separate FDA filings come next: establishment registration and process filing. Both go through the FDA’s LACF-specific electronic system, which is separate from the general food facility registration under the Bioterrorism Act.7U.S. Food and Drug Administration. Establishment Registration and Process Filing for Acidified and Low-Acid Canned Foods (LACF)
Register the Establishment
A commercial processor must register with the FDA within 10 days of first manufacturing, processing, or packing acidified or low-acid canned foods.8eCFR. 21 CFR 108.25 – Acidified Foods Registration uses Form FDA 2541 and includes the facility name, location, processing equipment, and the foods produced there. The FDA then assigns a Food Canning Establishment (FCE) number, which you’ll use on every process filing that follows.
File the Scheduled Process
After registration, the processor files the scheduled process information for each product in each container size. For acidified foods, filing must happen within 60 days of registration and before packing any new product.8eCFR. 21 CFR 108.25 – Acidified Foods The same timing applies to low-acid canned foods under a parallel regulation.9eCFR. 21 CFR 108.35 – Thermally Processed Low-Acid Foods Packaged in Hermetically Sealed Containers Match the form to the product:
- Form 2541e for acidified foods
- Form 2541d for low-acid foods processed by retort
- Form 2541f for foods controlled by water activity or formulation
- Form 2541g for low-acid foods processed by aseptic systems
Information on these forms comes straight from your scheduled process document: product name, container size, critical factors such as pH or water activity, and the time and temperature parameters.10U.S. Food and Drug Administration. Instructions for Paper Submission of Form FDA 2541 Once processed, the FDA issues a Submission Identifier (SID) confirming the filing. Keep both the scheduled process document and the SID confirmation on-site. Inspectors expect to see both during a facility visit.
Records You Have to Keep After Production Starts
Filing isn’t the finish line. Every batch has to be documented, and the records have to be available for inspection.
For acidified foods, records must show that each batch followed the scheduled process, including pH readings, any other critical factors, and enough identifying information (product code, date, container size) to trace a batch back through production.11eCFR. 21 CFR 114.100 – Records You also document initial distribution of each lot, so specific batches can be identified if a safety problem surfaces later.
For low-acid canned foods, logging runs deeper. Retort operators must record processing data as they observe it: initial temperature, actual processing time, readings from both the indicating and recording devices, venting times and temperatures, and container closure results.12eCFR. 21 CFR 113.100 – Processing and Production Records The specific data points depend on equipment type, but the principle holds: if the scheduled process calls it a critical factor, it gets recorded every batch.
Acidified food production records must be kept for at least three years from the date of manufacture, and they can be moved off-site after the initial period as long as they remain retrievable on request.11eCFR. 21 CFR 114.100 – Records
When a Batch Falls Outside the Scheduled Process
If a run drifts outside the parameters in the scheduled process, whether pH climbs above 4.6, retort temperature drops below the minimum, or processing time falls short, the regulation requires immediate action. You cannot simply ship the batch. The whole framework depends on the scheduled process being followed exactly.
For acidified foods, a deviation gives you three options:13eCFR. 21 CFR 114.89 – Deviations From Scheduled Processes
- Fully reprocess the batch by a method a process authority establishes as adequate.
- Thermally process it as a low-acid food under the more rigorous Part 113 retort requirements.
- Set the batch aside for evaluation by a process authority using recognized procedures to determine whether a public health hazard exists.
If you go the evaluation route, the authority conducts the assessment and you document both the procedures used and the results. If the evaluation cannot show the food is safe, you either reprocess or destroy the batch. Nothing affected can move in normal distribution until one of these paths resolves the deviation.13eCFR. 21 CFR 114.89 – Deviations From Scheduled Processes Low-acid canned foods have parallel deviation rules under Part 113.
Every deviation goes into a separate file with a description of what happened, what corrective action was taken, and what became of the affected product.11eCFR. 21 CFR 114.100 – Records Inspectors read deviation logs closely, and a pattern of deviations with weak responses is one of the fastest routes to enforcement.
What Happens If You Skip These Steps
Failing to register, failing to file a scheduled process, or operating without the required documentation is not treated as a paperwork oversight. The regulation is explicit: failure to meet 21 CFR 108.25 for acidified foods, or 108.35 for low-acid canned foods, is a prima facie basis for the FDA to invoke emergency permit control under Section 404 of the Federal Food, Drug, and Cosmetic Act.8eCFR. 21 CFR 108.25 – Acidified Foods In practice, the FDA can require you to obtain a special permit before continuing operations and can halt production until you do.
Beyond permit control, distributing food in violation of these rules can bring enforcement under the broader federal food safety statutes. Under 21 U.S.C. 333, a first criminal violation carries up to $1,000 in fines and up to one year of imprisonment; a second offense, or one with intent to mislead, rises to $10,000 and three years. Civil penalties for adulterated food can reach $50,000 per violation for an individual and $250,000 for a business entity, and the FDA also has authority to seize products and seek injunctions to stop distribution.14Office of the Law Revision Counsel. 21 USC 333 – Penalties For imported products, the agency can refuse entry at the border and place a processor’s entire product line on detention without physical examination, holding future shipments automatically until compliance is shown.15U.S. Food and Drug Administration. Agustson A/S Warning Letter 684572 The legal exposure from skipping registration or process filing runs well beyond the cost and time of doing it right.