Bromated flour is wheat flour treated with potassium bromate, a flour improver used in some commercial baking. It is a treatment, not a wheat variety, pizza-flour class, or another name for 00 flour. To check a bag, look for potassium bromate in its ingredient statement. An exact product page that says bromate-free or unbromated is another useful answer for that named flour.
Why bakers use potassium bromate
Potassium bromate is a flour improver and slow-acting oxidizer. In everyday terms, a commercial baker may use that treatment to influence dough strength during mixing and baking. That is why the term turns up in pizza and bagel conversations, where yeast-dough performance matters in commercial production.
The federal standard permits potassium bromate in standardized bromated flour only where it improves baking qualities, subject to the rule's conditions and 50 parts per million maximum. See 21 CFR 137.155. This does not mean every pizza or bagel flour uses it.
Bromated, unbromated, bleached and enriched
| Label | What it means | What it does not tell you alone |
|---|---|---|
| Bromated | The flour has potassium bromate treatment. | Its flour type or recipe fit. |
| Unbromated or bromate-free | The maker says that exact product is not bromated. | The status of every flour from that brand. |
| Bleached | A separate flour whitening or aging treatment. | Whether it is bromated or enriched. |
| Enriched | Nutrients have been restored or added under the product's labelling context. | Whether it is bromated or bleached. |
Labels such as 00, bread flour and all-purpose flour answer a different question about the flour. The pizza flour types guide explains those labels.
How to check the flour you have
- Read the ingredient statement on the exact package for
potassium bromate. - Check the matching product page for an explicit
bromate-freeorunbromatedstatement. - If neither settles it, ask the manufacturer or supplier about that product and package.
Protein percentage, country of origin, a 00 label, an unbleached claim or a familiar brand name do not settle bromate status.
US status checked 2 September 2026
This is general context, not legal advice.
- Federal: 21 CFR 137.155 permits standardized bromated flour under stated conditions, including the 50 ppm maximum.
- California: California's statewide prohibition on food containing potassium bromate begins on 1 January 2027, according to the California Department of Education summary of the relevant state provision.
- New York: official Senate material dated 9 July 2026 said S1239F/A1556G had passed and was awaiting the Governor's signature. That was not confirmed enacted law. See the New York Senate release for the dated status.
Rules can change, so a bakery or seller should check the current rule for its own jurisdiction. For a home purchase, clear product wording is the practical first step.
Switching to unbromated flour
For home pizza, choose an exact flour explicitly labelled unbromated or bromate-free and use a recipe suited to that flour when possible. There is no need to infer a treatment from unrelated label details.
For a bakery or pizza operation, a flour change is a production change. King Arthur's professional guidance says bakers moving from bromated flour may need to revisit mixing, dough temperature and fermentation tolerance. Those are supplier-specific considerations, not a fixed conversion. Use current supplier guidance and test the formula before treating a switch as routine.
Exact product examples
Two clear product-page examples show what to look for. In this site's reviewed US set, six individual Caputo product records carried the maker's bromate-free wording as of 2 September 2026.
| Product | What its US product page said at review |
|---|---|
| Caputo 00 Pizzeria Flour | Bromate-free; the page also made separate claims about bleach, conditioners and enzyme systems. |
| Caputo 00 Chef's Flour | Bromate-free; the page also made separate claims about bleach, conditioners and enzyme systems. |
Those are manufacturer claims for named US product pages, not laboratory results or a statement about every Caputo flour. Browse the pizza flour registry for the product-level sources behind these examples.
The useful takeaway
Bromated flour is flour treated with potassium bromate. If avoiding bromate matters to you, choose an exact product that says bromate-free or unbromated and keep the package or matching product page in view.