What to Ask Your Supplier About PFAS (Before a State Law Asks You)

Most PFAS guidance is written for corporate counsel. This page is for the seller who needs to email a supplier in Shenzhen tonight and come away with answers that hold up. PFAS — per- and polyfluoroalkyl substances — are a family of chemicals used industrially for water, oil, and stain resistance, for non-stick coatings, and for durable water repellent (DWR) finishes on textiles. A growing list of state laws restricts or bans products that contain them, and several are already in force.

Seven states now regulate PFAS in consumer products, on different categories and different dates — Minnesota's bans have been in force since 2025, Connecticut's label-and-notify obligation lands July 1, 2026, and the full state-by-state picture is on our PFAS requirements map, with deeper dives on Minnesota and Connecticut.

What these laws share is one operative phrase: intentionally added. These laws turn on whether someone, somewhere in the production chain, put PFAS into the product on purpose to do a job — repel water, resist stains, release food from a pan. That phrase should shape every question you send a supplier.

Ask a final-assembly supplier whether there is PFAS in the product and you will often get a quick, sincere no. The supplier is thinking about what their own factory adds — not the DWR finish their fabric mill applied, the coating already on a cookware blank they bought in, or the stain treatment a sub-supplier ran before the material reached their floor.

The better question: is PFAS intentionally added at any stage — including coatings, finishes, and treatments applied by your sub-suppliers?

That phrasing does three things. It uses the same trigger language the state laws use, so the answer maps onto what regulators actually regulate. It explicitly reaches sub-suppliers, which is where the chemistry usually enters. And it leaves the supplier no honest way to answer without checking upstream — or admitting they have not.

Water- and stain-repellent finishes and non-stick coatings are the classic hiding places. A jacket's shell fabric may carry a DWR finish applied at the mill. Upholstery may have been treated for stain resistance before cutting. Cookware may arrive at final assembly already coated. In each case, the factory shipping you the finished product may genuinely not know what its upstream suppliers applied — which is why an honest answer at the final-assembly level can still be wrong for your product.

Two pieces.

First, a written declaration that no PFAS is intentionally added. To be worth anything, it should name the specific product and explicitly cover inputs from sub-suppliers. A generic letter saying the factory's products are PFAS-free, with no product name and no mention of upstream materials, tells you very little.

Second, for higher-risk categories — water-repellent textiles, non-stick cookware, treated furnishings — third-party test data. These are the categories where PFAS chemistry is most likely to be doing a job, so a paper declaration alone carries less weight.

One scope note: a technical data sheet (TDS) or a test report describes a grade or a sample, not your shipment. What that distinction means in practice is covered in our guide to material-level verification.

When test data comes back, the first thing you will often see is a total fluorine or total organic fluorine (TF/TOF) screening result. Read it for what it is: an indicator. Elevated total fluorine suggests fluorinated chemistry is present somewhere in the sample. It does not identify which PFAS compounds are there, and it does not by itself prove intentional addition. Targeted PFAS analysis is the step that identifies specific compounds.

This is not a reason to dismiss screening — regulators themselves use it. Washington's amended rule explicitly uses a total-fluorine threshold. The honest reading is layered: a clean screen is meaningful reassurance, an elevated screen is a flag for targeted analysis and a harder supplier conversation, and neither is a final verdict on its own.

Testing should come from an accredited lab: ISO/IEC 17025, under an ILAC-recognized accreditation body — for Chinese labs, that means CNAS accreditation. Accreditation does not make a report unquestionable, but it gives you something to check. How to run those checks is covered in how to verify a supplier test report, and the warning signs of fabricated documents are in fake test report red flags.

A declaration describes the product as it was made when the declaration was signed. Supplier inputs can drift after first approval — the quality-fade pattern documented in Paul Midler's book Poorly Made in China, and one we return to across these guides. A cheaper coating, a substituted fabric mill, a new sub-supplier: any of these can quietly change the answer to your PFAS question without anyone telling you. Treat declarations and test reports as documents with a shelf life. Re-confirm periodically, and re-confirm immediately after any supplier or material change.

Plain language to adapt to your product and relationship — not legal language, and not a substitute for advice from your own counsel.

1. Is PFAS intentionally added to [product name] at any stage of production, including coatings, finishes, or treatments applied by your sub-suppliers?
2. Can you provide a written declaration, naming this specific product, that no PFAS is intentionally added, covering materials and inputs from your sub-suppliers?
3. Who supplies the fabric, coating, or surface treatment for this product, and have you confirmed this in writing with them?
4. If the product is in a higher-risk category — water-repellent textile, non-stick cookware, treated furnishings — can you provide third-party test data from an ISO/IEC 17025 accredited lab?
5. Will you notify us in writing before changing any material, coating, finish, or sub-supplier used in this product?

If you want to know which state rules actually reach your products and when, our free Deadline Checker takes your product category and the states you sell into and shows which requirements apply.

Why is asking a supplier whether a product contains PFAS the wrong question?

State laws key on whether PFAS is intentionally added, not on whether any trace is present. A final-assembly supplier can sincerely answer no while a sub-supplier's coating or water-repellent finish contains PFAS. Ask instead whether PFAS is intentionally added at any stage, including treatments applied by sub-suppliers.

What should a supplier PFAS declaration include?

It should be in writing, name the specific product, state that no PFAS is intentionally added, and explicitly cover materials and inputs from sub-suppliers. A generic letter that does not name the product or address upstream inputs tells you very little. For higher-risk categories, pair the declaration with third-party test data.

What does a total fluorine screening result actually tell you?

Total fluorine or total organic fluorine (TF/TOF) screening is a first-pass indicator. An elevated result suggests fluorinated chemistry is present, but it does not identify which PFAS compounds are there or prove intentional addition. Targeted PFAS analysis is what identifies specific compounds.

Which products need test data rather than just a declaration?

Categories where PFAS chemistry is most likely to be doing a job: textiles with durable water repellent finishes, non-stick cookware, and treated furnishings. For these, ask for third-party test data from an accredited lab alongside the written declaration.

How often should I re-confirm a supplier's PFAS declaration?

Declarations and test reports describe the product as it was when they were issued, and supplier inputs can drift after first approval. Re-confirm periodically and any time the supplier, a sub-supplier, or a material, coating, or finish changes.