If you commercially produce acidified foods in the United States, FDA acidified foods regulations require you to register your plant, have a qualified Process Authority validate your recipe, file that scheduled process with FDA, keep a trained supervisor on the floor during production, and document pH and processing for every batch. The rules live primarily in 21 CFR Parts 108 and 114, and they exist for one reason: to keep the finished product at or below an equilibrium pH of 4.6 so Clostridium botulinum cannot produce toxin. Miss the mark and civil penalties now reach $498,517 per violation for a business and $99,704 for an individual.
What Counts as an Acidified Food
Federal regulations define acidified foods as low-acid foods with acid or acid foods added to bring the finished product to an equilibrium pH of 4.6 or below and a water activity above 0.85.1eCFR. 21 CFR 114.3 – Definitions The operative word is “added.” Pickled cucumbers, artichokes, cauliflower, peppers, and green beans preserved in vinegar or citric acid are the classic examples.
Several categories sit outside the rule. Naturally acidic foods like most fruits are regulated separately as “acid foods.” Carbonated beverages are excluded. So are jams, jellies, preserves, and condiment sauces that are predominantly acid foods with small amounts of low-acid ingredients. Foods held, shipped, and sold under continuous refrigeration are also out, because their safety depends on cold rather than pH.1eCFR. 21 CFR 114.3 – Definitions
Fermented products are a common gray zone. The regulation does not list them explicitly, and traditional sauerkraut or kimchi develop acidity through microbial activity rather than added acid, so they generally do not meet the “acidified” definition. If your recipe adds vinegar or citric acid to a low-acid vegetable, though, a Process Authority should evaluate whether Part 114 applies before you assume it doesn’t.
Register the Facility with FDA
Before shipping any acidified product, you have to register the plant as a Food Canning Establishment on Form FDA 2541. Registration must happen no later than 10 days after you begin manufacturing, processing, or packing acidified foods, and each physical plant gets its own form.2eCFR. 21 CFR 108.25 – Acidified Foods The form captures the establishment name and address, each plant location, the method of processing in terms of acidity and pH control, and the foods processed at each site.
FDA then assigns a Food Canning Establishment (FCE) number that identifies the plant in the federal database. Electronic filings through FDA’s AF/LACF system generate the FCE number automatically with an email confirmation; paper filings take longer because FDA assigns and mails the number manually.3U.S. Food and Drug Administration. Guidance for Industry – Submitting Form FDA 2541 and Food Process Filing Forms to FDA FDA charges no fee for registration, though state food-manufacturing permits carry their own costs.
Get a Scheduled Process from a Process Authority
A “scheduled process” is the specific set of steps you use to guarantee a safe finished product, covering acidity control, temperatures, and heating time.1eCFR. 21 CFR 114.3 – Definitions You cannot write one yourself. A qualified Process Authority, an individual or organization with expert knowledge in thermal processing and acidification, must evaluate the recipe, validate the processing steps, and issue a formal process letter.
Federal regulations recognize several acidification methods the Process Authority can specify: blanching ingredients in acidified water, immersing blanched food in an acid solution, adding a measured dose of acid directly to each batch, adding a predetermined dose of acid to individual containers during production, or combining acid and low-acid foods in controlled ratios.4eCFR. 21 CFR 114.80 – Processes and Controls The letter also spells out the thermal treatment needed to destroy vegetative cells of harmful and spoilage microorganisms.
University-based Process Authorities generally charge between $100 and $400 per product for standard validation, with expedited review costing more. Typical turnaround is four to six weeks. Reevaluating a scheduled process every three years is recommended practice, and modifying an existing formula usually costs less than a new validation.
File the Process with FDA
After you have the FCE number, you file the scheduled process on Form FDA 2541e, one filing for each acidified food in each container size. The deadline is no later than 60 days after registration, and it has to happen before you pack any new product.2eCFR. 21 CFR 108.25 – Acidified Foods The form asks for container type and size, heating medium, minimum initial product temperature, acidification method, and the maximum pH the finished product can reach.
Most producers file electronically through FDA’s Industry Systems portal, which issues a Submission Identifier (SID) for each filing and processes faster than paper.5U.S. Food and Drug Administration. Establishment Registration and Process Filing for Acidified and Low-Acid Canned Foods
Filing is not approval. The regulation explicitly states that filing your process with FDA does not constitute FDA approval of the product or the process.2eCFR. 21 CFR 108.25 – Acidified Foods Responsibility for safety rests on the manufacturer and the Process Authority. FDA treats the information as trade secrets and uses it for oversight and enforcement.
Put a Trained Supervisor on the Floor
Processing and packaging operations must be supervised by someone who has completed an FDA-approved course in acidified food control.6eCFR. 21 CFR 114.10 – Personnel These programs, offered through universities and widely known as Better Process Control School, cover pH control, thermal processing, and container integrity. The acidified foods module typically runs two to four days, with tuition roughly $400 to $700 depending on the institution and format.
The trained supervisor has to be present during the entire time processing and packaging take place. Their job is to catch a drift in brine acidity or a pH reading of 4.8 before that batch reaches a customer.
Control and Verify pH
pH meters must be calibrated before each use with buffer solutions at pH 4.0 and 7.0, or 7.0 and 10.0 depending on the expected range, and you must test frequently enough during production to confirm the finished equilibrium pH stays at or below 4.6.4eCFR. 21 CFR 114.80 – Processes and Controls
The required testing method depends on where the product falls. If the finished equilibrium pH is above 4.0, the final measurement must be potentiometric (a calibrated pH meter). In-process checks can use titration or colorimetric methods, but they must be correlated to the finished equilibrium pH. If the finished pH is 4.0 or below, any suitable method works.4eCFR. 21 CFR 114.80 – Processes and Controls Products treated with lye, lime, or similar high-pH substances need extra care because residual alkalinity skews readings.
Thermal treatment must be adequate to destroy both dangerous microorganisms and spoilage organisms that could reproduce under the product’s storage conditions. Containers must be inspected often enough to confirm they protect the food from leakage or contamination, and each container must carry a permanent, visible lot code.4eCFR. 21 CFR 114.80 – Processes and Controls
When a Batch Deviates
If a batch strays from the scheduled process or the finished equilibrium pH comes in above 4.6, you have three lawful options. You can fully reprocess the affected portion using a method established by a Process Authority as adequate to make it safe. You can thermally process it as a low-acid canned food under the stricter requirements of 21 CFR Part 113. Or you can set the product aside for a formal evaluation by a Process Authority to determine whether it poses a public health risk.7eCFR. 21 CFR Part 114 – Acidified Foods
If the evaluation finds the product did not receive a process sufficient to make it safe, the food must be fully reprocessed or destroyed. You cannot ship it. The evaluation procedures must follow methods recognized by qualified processing authorities, and you have to keep records of what was reviewed, what procedures were used, and what happened to the affected food.
Records You Must Keep
Production records must show adherence to the scheduled process, including pH measurements and other critical control factors. Each record needs enough identifying information (product codes, dates, container sizes, product names) to let FDA evaluate the safety of any specific lot after the fact.8eCFR. 21 CFR 114.100 – Records
Deviations from the scheduled process that could affect safety are documented separately. The record must identify the product, describe the deviation, describe the corrective action, and state what became of the food. You also have to maintain records tracking initial distribution of each finished product so specific lots can be traced and recalled.8eCFR. 21 CFR 114.100 – Records
Retain all processing, deviation, and distribution records for at least three years from the date of manufacture. They can live at the plant or another reasonably accessible location so long as they are available to FDA inspectors.8eCFR. 21 CFR 114.100 – Records One point of confusion worth clearing up: the one-working-day review-and-sign rule many producers assume applies here actually comes from the low-acid canned food regulations at 21 CFR 113.100, not from Part 114.9eCFR. 21 CFR 113.100 – Processing and Production Records Prompt review is still sound practice.
Electronic Records
If you keep production logs, pH data, or signatures digitally, the system has to meet 21 CFR Part 11. That means validated software, secure computer-generated audit trails that timestamp every entry and change, access controls limited to authorized users, and electronic signatures unique to each person and linked to their records so they cannot be copied or transferred.10eCFR. 21 CFR Part 11 – Electronic Records and Electronic Signatures Each signed entry has to show the signer’s printed name, date and time, and the reason for the signature.
FSMA Preventive Controls Still Apply
Complying with Part 114 does not exempt you from the Food Safety Modernization Act’s preventive controls rule at 21 CFR Part 117. Low-acid canned food manufacturers get an explicit exemption from Part 117’s hazard analysis and preventive controls requirements; acidified food producers do not appear in that exemption list.11eCFR. 21 CFR 117.5 – Exemptions So an acidified foods facility also has to conduct a written hazard analysis, put risk-based preventive controls in place where hazards are identified, and maintain a written recall plan.
The recall plan must describe how the facility will notify direct customers, handle or dispose of the affected product, inform the public when necessary, verify that the recall is working, and dispose of recalled product through reprocessing, diversion, or destruction.12eCFR. 21 CFR 117.139 – Recall Plan Small operations may qualify for modified requirements under the “qualified facility” exemption if they meet the sales thresholds, but the exemption is narrow and imposes its own obligations, so verify status carefully.
Importing Acidified Foods
Importers of acidified foods must comply with the Foreign Supplier Verification Program at 21 CFR Part 1, Subpart L. The importer conducts a written hazard analysis for each imported food and approves foreign suppliers based on food safety practices, compliance history, and product risk. The aim is to confirm the foreign supplier meets at least the same level of safety as domestic law requires.13eCFR. 21 CFR Part 1, Subpart L – Foreign Supplier Verification Programs for Food Importers
Verification can involve onsite audits, sampling and testing, or reviewing the supplier’s safety records. If a supplier falls short, the importer must take prompt corrective action. At entry, the importer provides its name, email, and a unique FDA-recognized facility identifier for each line entry. FSVP records, including hazard analyses, supplier evaluations, and corrective actions, must be kept for at least two years and made available to FDA on request.13eCFR. 21 CFR Part 1, Subpart L – Foreign Supplier Verification Programs for Food Importers
Penalties for Noncompliance
Introducing adulterated food into interstate commerce, which includes acidified food processed in violation of these rules, can trigger civil monetary penalties. As of 2026, the inflation-adjusted maximums are $99,704 for an individual and $498,517 for any other person, with an aggregate cap of $997,034 for all violations in a single proceeding.14GovInfo. Federal Register – Civil Monetary Penalties Inflation Adjustment for 2026 FDA can also pursue product seizures and court injunctions.15Office of the Law Revision Counsel. 21 USC 333 – Penalties
When FDA determines there is a reasonable probability that an acidified food will cause serious health consequences or death, it can invoke mandatory recall authority. The agency first offers the manufacturer a chance to cease distribution voluntarily; if the company refuses or moves too slowly, FDA can order distribution stopped and, after a hearing, mandate a full recall on a set timetable with progress reports and consumer notification. Only the FDA Commissioner can issue or vacate a recall order.16Office of the Law Revision Counsel. 21 USC 350l – Mandatory Recall Authority
Most enforcement actions stem from preventable failures: operating without a filed scheduled process, running production without a trained supervisor on site, or shipping product that was never properly tested. Inspectors look at records, training documentation, and process filings first. If those are in order and the pH logs back them up, the rest usually follows.