King Arthur’s conventional flour is not guaranteed glyphosate free. The company permits glyphosate use on non-organic wheat as long as residue levels stay below the federal limit of 30 parts per million. If avoiding glyphosate is your priority, King Arthur points customers toward two specific options: their certified organic flour line, where glyphosate is prohibited entirely, and their non-organic White Whole Wheat Flour, which bans glyphosate at a specific stage of farming.
What King Arthur Actually Says About Glyphosate
King Arthur’s position breaks down differently depending on which product you’re buying. For their conventional (non-organic) flours, the company acknowledges that glyphosate is federally approved for use by wheat farmers. They state that any application must comply with regulatory approval and that residual levels “should remain well below” the federal limit of 30 ppm for cereal grains. That’s not a guarantee of zero glyphosate. It’s a statement that their suppliers follow existing regulations.
The company also describes any internal testing or verification as “proprietary,” meaning they won’t share specific residue data with consumers. King Arthur does not carry The Detox Project’s “Glyphosate Residue Free” certification, which is the main third-party seal that verifies products have been tested and found free of glyphosate residues.
The Organic Line Prohibits Glyphosate
King Arthur’s certified 100% organic flours are the clearest option if you want to avoid glyphosate. Under organic certification rules, glyphosate use is prohibited at every stage of production. Their organic line is independently verified by Quality Assurance International (QAI), an accredited organic certifier that audits compliance with organic standards.
It’s worth noting that “prohibited” and “zero residue” aren’t quite the same thing. Organic crops can occasionally pick up trace contamination from neighboring conventional fields through wind drift or shared water sources. But the levels found in organic products are consistently far lower than in conventional ones, and the intentional application of glyphosate is not allowed at any point.
The Field-to-Flour Exception
King Arthur has one non-organic product with a specific glyphosate restriction: their White Whole Wheat Flour, the first product in their “Field-to-Flour” program. This program traces the wheat back to the farm it came from and sets crop management guidelines. One of those guidelines is that glyphosate cannot be used as a pre-harvest application on the white spring wheat milled for this flour.
Pre-harvest application (sometimes called desiccation) is when farmers spray glyphosate on wheat shortly before harvest to dry it down and make harvesting easier. This practice tends to leave higher residue levels on the grain compared to earlier-season applications, because the chemical is applied so close to the point when the wheat is collected. By banning this specific use, King Arthur reduces the most significant source of glyphosate residue on that particular flour, even though it’s not organic.
This restriction only applies to the White Whole Wheat Flour in the Field-to-Flour program. It does not apply to their conventional all-purpose flour, bread flour, or other non-organic products.
How to Choose Based on Your Concern Level
Your best option depends on how strictly you want to avoid glyphosate:
- Strongest protection: King Arthur’s certified organic flours. Glyphosate is prohibited and compliance is independently audited.
- Middle ground: The non-organic White Whole Wheat Flour from the Field-to-Flour program, which bans the pre-harvest glyphosate application most associated with higher residues.
- Standard conventional flour: No specific glyphosate restrictions beyond federal regulations. Residues may be present at levels the EPA considers safe (under 30 ppm).
Why This Matters for Wheat Specifically
Glyphosate concerns come up more often with wheat and oat products than with many other foods. That’s because of the pre-harvest desiccation practice mentioned above. Unlike corn or soybeans, where glyphosate is typically applied earlier in the growing season to genetically modified crops designed to tolerate it, wheat is not genetically modified. Instead, some conventional wheat farmers spray glyphosate right before harvest as a drying agent. This late-stage application is the primary reason glyphosate residues show up in grain-based foods.
The federal tolerance for cereal grains sits at 30 parts per million. Whether that level is protective enough is a matter of ongoing debate among scientists and regulators worldwide. Different countries set different limits, and some consumer advocacy groups argue the U.S. threshold is too generous. If you’d rather not rely on that federal standard as your safety net, organic flour sidesteps the question entirely.