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Acidified Food Co-Packers: A Practical Guide for Sauce, Salsa & Pickle Brands

By USA Factory NetworkNovember 5, 2026

Making a shelf-stable sauce, salsa or pickle? Learn FDA acidified food rules, process authority letters and how to vet a co-packer before your first run.

Acidified Food Co-Packers: A Practical Guide for Sauce, Salsa & Pickle Brands

Quick answer: If your shelf-stable product is a low-acid food with acid or acid ingredients added to bring its finished equilibrium pH to 4.6 or below (think hot sauce, salsa, pickled vegetables or many BBQ sauces), FDA likely treats it as an acidified food under 21 CFR Part 114. The plant that makes it needs to be registered with FDA as a food canning establishment, file a scheduled process for each product and container size, and run under a supervisor trained at an FDA-approved school. The process itself is set by a qualified process authority. So the right co-packer isn't just any FDA-registered facility. It's one already set up for acidified foods.

This guide covers how to tell whether your product counts as an acidified food, what paperwork you and your co-packer each handle, the questions to ask before you sign, and how to get matched with US manufacturers that already run these products.

What Counts as an Acidified Food?

FDA defines acidified foods in 21 CFR 114.3(b) as low-acid foods to which acid(s) or acid food(s) are added, with a water activity greater than 0.85 and a finished equilibrium pH of 4.6 or below. Vinegar-based hot sauces, salsas, pickled peppers, giardiniera and many dressings and marinades often fall here.

The regulation also lists products that are not covered by Part 114, including:

  • Acid foods that are naturally at pH 4.6 or below (many fruit products)

  • Carbonated beverages

  • Jams, jellies and preserves covered by their own standards

  • Fermented foods, like traditionally fermented pickles or sauerkraut

  • Foods stored, distributed and sold under refrigeration

Don't make the call on gut feel. A recipe that's "mostly tomatoes" can still be acidified once you add onions, peppers or garlic. A process authority, or a co-packer working with one, should confirm how your formula is classified. FDA's process-filing system also lets processors send in information voluntarily when they've decided a product is not an acidified food, which is worth asking about if your product is a borderline case.

Acidified vs. other categories at a glance

  • Acidified food

    • Example: Vinegar hot sauce, salsa, quick pickles

    • Main FDA framework: 21 CFR 108.25 + Part 114

    • What it means for your co-packer: Food canning establishment registration, a scheduled process filed per product and container size, a supervisor trained at an approved school

  • Low-acid canned food (LACF)

    • Example: Canned beans, soups, broths

    • Main FDA framework: 21 CFR 108.35 + Part 113

    • What it means for your co-packer: Retort or aseptic capability and their own process filings

  • Acid food

    • Example: Many fruit juices and fruit sauces

    • Main FDA framework: General cGMP / Preventive Controls (Part 117)

    • What it means for your co-packer: Not covered by Part 114. Standard facility food safety rules still apply

  • Fermented food

    • Example: Lacto-fermented pickles, kimchi

    • Main FDA framework: Excluded from Part 114

    • What it means for your co-packer: Needs fermentation know-how and its own safety controls

  • Refrigerated product

    • Example: Fresh salsa, refrigerated pickles

    • Main FDA framework: Excluded from Part 114

    • What it means for your co-packer: Needs a cold chain all the way to the shelf

This table is a starting point, not legal advice. Your process authority makes the final call on classification.

The FDA Requirements Behind an Acidified Food Run

Brands often hear "FDA-registered" and assume that settles it. For acidified foods, a few separate requirements stack up.

1. Food Facility Registration

Under the Federal Food, Drug, and Cosmetic Act, as amended by the Bioterrorism Act and FSMA, any facility that makes, processes, packs or holds food for US consumption generally has to register with FDA. The registration has to be renewed every two years, between October 1 and December 31 of each even-numbered year. Every manufacturer you meet through USA Factory Network is FDA-registered. For acidified foods, though, this is only step one.

2. Food Canning Establishment (FCE) Registration

Under 21 CFR 108.25(c)(1), a commercial processor making acidified foods must register on Form FDA 2541 within 10 days of starting that work. This is a separate registration from the general food facility registration.

3. Scheduled Process Filing (Form FDA 2541e)

Within 60 days of registration, and before packing any new product, the processor must file its scheduled process with FDA on Form FDA 2541e. One filing covers one acidified food in one container size. The filing covers things like heat processing conditions and how pH, salt, sugar and preservatives are controlled. FDA states that filing is not approval. Practical takeaway: if you add a new SKU or switch from a 5 oz bottle to a 12 oz jar, plan for a new or updated filing.

4. A Scheduled Process from a Qualified Person

Part 114 requires the scheduled process to be set by a qualified person with expert knowledge of acidification and processing. In the industry this person is usually called a process authority, and the document you get back is often called a process letter or process authority letter. Process authorities can be university food science programs, independent labs or consultants.

5. Trained Supervision

Under 21 CFR 114.10, acidified food operations must run under a supervisor who has attended an FDA-approved school. This training is widely known as Better Process Control School.

6. FSMA and cGMP Still Apply

Acidified food rules sit on top of current Good Manufacturing Practices. Depending on the facility, FSMA's Preventive Controls for Human Food rule (21 CFR Part 117) applies too. For a deeper look at the wider framework, see our FDA Compliance & Regulatory Guide and Food Safety Beyond FDA: HACCP, SQF & Third-Party Audits.

Who Does What: Brand vs. Co-Packer vs. Process Authority

Splitting up responsibilities early helps avoid delays at the first production run.

  • Final formula and target pH

    • Usually handled by: Brand (with the co-packer's R&D, if offered)

    • Notes: Bring a locked recipe with weights, not just volumes

  • Process review and scheduled process

    • Usually handled by: Process authority

    • Notes: Some co-packers have relationships with one already. Ask who pays

  • FCE registration (Form 2541)

    • Usually handled by: Co-packer (the processor)

    • Notes: Confirm the plant is already registered

  • Process filing (Form 2541e)

    • Usually handled by: Co-packer

    • Notes: Ask for the filing confirmation for your SKU

  • Trained supervisor on the line

    • Usually handled by: Co-packer

    • Notes: Ask who holds the training

  • Batch records, pH logs, deviation records

    • Usually handled by: Co-packer

    • Notes: You should be able to review them

  • Labels and nutrition facts

  • Shelf-life validation

Arrangements differ from plant to plant. Some co-packers own the process filing outright. Others expect the brand to bring a process letter. Get this in writing.

Step-by-Step: Getting Your Sauce, Salsa or Pickle into Production

  1. Lock your formula. Turn your kitchen recipe into a weight-based formula with exact ingredient specs, such as vinegar strength and pepper variety.

  2. Get a preliminary classification. Have a process authority or food science lab review the formula and confirm whether it's an acidified food, an acid food or something else.

  3. Decide on container and fill method. Glass jars, woozy bottles and pouches can each need different process conditions. Each container size needs its own filing.

  4. Shortlist co-packers that already run acidified foods. Ask for proof of FCE registration and experience with similar pH and viscosity products.

  5. Obtain or confirm the scheduled process. Either the co-packer's process authority reviews your product or you bring a process letter the co-packer accepts.

  6. Confirm the filing. Make sure the co-packer has filed (or will file) Form 2541e for your product and container size before your product is packed.

  7. Run a pilot or test batch. Check pH, fill weights, cap torque and flavor against your target. Read Pilot Run vs. First Commercial Run to see what changes when you scale.

  8. Review your first-run paperwork. Ask for batch records and pH logs. Our First Production Run Checklist walks through the rest.

Questions to Ask an Acidified Food Co-Packer

Add these to the general list in 30 Questions to Ask a Co-Packer:

  • Is your facility registered with FDA as a food canning establishment (Form 2541)?

  • Do you have acidified products on your current filings? Which formats (hot fill, glass, PET, pouch)?

  • Who is your process authority, and will they review my formula? Who pays for that review?

  • Who holds Better Process Control School training on each shift that would run my product?

  • How do you measure and record equilibrium pH, and how often per batch?

  • What happens if a batch is out of spec? Can I see your deviation procedure?

  • Will you file Form 2541e for each of my container sizes, and will I get a copy of the confirmation?

  • Who owns the formula and the process documentation? (See our guide to protecting your recipe.)

  • What are your minimum order quantities and lead times for my format?

Red flags

  • "We're FDA-registered, so you're covered" with no mention of FCE registration or process filing

  • No named process authority and no plan to get one

  • Can't explain how pH is checked during production

  • Reluctance to share batch or pH records with you

Costs, MOQs and Timelines: What to Expect

We won't quote a price here, because costs depend on your formula, container, run size and region. They vary too much for a single figure to be useful. Expect a few cost lines that don't come up with non-acidified products: the process authority review, possible lab pH or shelf-life testing, and sometimes a setup or filing fee from the co-packer. Glass and hot-fill lines can also carry different minimums than cold-fill lines.

For a framework to budget and compare quotes, read Cost Breakdowns: What to Expect When Working with US Contract Manufacturers and Understanding MOQs, Lead Times & Pricing.

How USA Factory Network Helps

USA Factory Network is a matchmaker, not a manufacturer or seller. When you send in a free matching request, include your product type, target pH if known, container format and estimated volume. We connect you with FDA-registered, US-only manufacturers whose capabilities fit your needs, usually within about 48 hours. From there, you vet each one, confirm their acidified food registrations and filings, and decide who to work with.

You can also browse Condiment & Ingredient Manufacturers or Co-Packing & Private Label partners in our directory.

Submit a free matching request →

Frequently Asked Questions

Is hot sauce an acidified food?

Many shelf-stable hot sauces are acidified foods, because low-acid ingredients like peppers, onions and garlic are acidified with vinegar or other acids to a finished equilibrium pH of 4.6 or below. Traditionally fermented hot sauces and refrigerated sauces are excluded from 21 CFR Part 114. A process authority should confirm how your product is classified.

What is a process authority letter?

A process authority letter is a written scheduled process from a qualified expert in acidification and food processing. It sets how your product must be made to be safe, for example pH targets, heat treatment and hold times. FDA requires acidified foods to be made under a scheduled process set by a qualified person.

Does my co-packer need special FDA registration for acidified foods?

Yes. Beyond standard Food Facility Registration, a processor of acidified foods must register as a food canning establishment on Form FDA 2541. It must also file a scheduled process on Form FDA 2541e for each acidified food in each container size before packing it.

Do I need Better Process Control School as a brand owner?

FDA requires acidified food operations to run under a supervisor who has attended an FDA-approved school. If your co-packer runs production, that supervisor is usually on their staff. Brand owners can take the course to understand the process better, but the requirement applies to the operation making the food.

Are refrigerated salsas regulated as acidified foods?

Foods stored, distributed and sold under refrigeration are excluded from 21 CFR Part 114. They still fall under general FDA food safety rules, and they need a dependable cold chain from the plant to the shelf.

How do I find a co-packer for acidified foods?

Look for FDA-registered facilities that already have food canning establishment registration and acidified product filings for formats like yours. You can submit a free matching request on USA Factory Network to be connected with US manufacturers that fit your product, usually within about 48 hours.

Ready to Find an Acidified Food Co-Packer?

Tell us what you're making, how it's packaged and how much you need. We'll connect you with FDA-registered American manufacturers that fit. It's free for brands.

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Sources

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