As of September 12, 2026
Three states put their names on school-food dye law this spring, and no two of them wrote the same law. Iowa banned eight substances outright. Louisiana quietly deleted one sweetener from a disclosure list. Tennessee just widened a ban it had already passed once.
Start with Iowa. On May 20, 2026, Governor Kim Reynolds signed House File 2676, the state's "Make America Healthy Again" bill, at a ceremony attended by Robert F. Kennedy Jr., according to Iowa Public Radio. The enrolled bill text prohibits Red 40, Yellow 5, Yellow 6, Blue 1, Blue 2, Green 3, potassium bromate, and propylparaben in meals served through school breakfast and lunch programs, and bars their sale on campus during the school day, with an exception for food delivered directly through USDA's Foods in Schools program. The restriction does not take effect immediately. Per the bill's own text, it applies "to school years beginning on or after July 1, 2027." Iowa's list mixes two different categories: six color additives and two non-color additives, potassium bromate and propylparaben, that regulators have scrutinized on separate grounds.
Louisiana moved differently, and the direction of the move matters. In 2025 the state had passed a law requiring QR codes on foods containing certain additives, linking to FDA disclosure information, plus a companion prohibition on some of those additives in school food. On June 1, 2026, Governor Jeff Landry signed Senate Bill 57, enacted as Act No. 735, which amends that 2025 law rather than expanding it. According to the enrolled text and a summary from The Daily Intake, SB 57 removes acesulfame potassium from both the QR-code trigger list and the school-food prohibition list. It also narrows the disclosure requirement to additives the FDA already requires to be named on a food label, exempting incidental additives present at low levels. The QR-code compliance date, originally set for January 2028, is now pushed to December 31, 2028. Louisiana's 2026 law is a rollback and a delay, not a new restriction. That is a meaningfully different mechanism from Iowa's outright ban, and the difference is easy to miss if you only read a headline that says "Louisiana passes new food law."
Tennessee's 2026 law is the mirror image of Louisiana's: an expansion, not a narrowing. The state had already restricted Red 40 alone in school meals under an earlier bill. Governor Bill Lee signed Senate Bill 2423 on March 25, 2026, enacted as Public Chapter 619, which broadens that restriction to seven named synthetic dyes: Allura Red AC (Red 40), Erythrosine (Red 3), Tartrazine (Yellow 5), Sunset Yellow FCF (Yellow 6), Erioglaucine disodium salt (Blue 1), Indigo carmine (Blue 2), and Fast Green FCF (Green 3), according to the bill's legislative record. The school-cafeteria restriction itself takes effect for the 2027-28 school year, the same timeline Iowa chose.
None of this started in 2026. California's AB 2316, signed by Governor Gavin Newsom in September 2024, was the first state law to bar certain synthetic dyes from school food, and it is the law other states have referenced since. Texas followed in 2025 with Senate Bill 25, a broader warning-label law covering roughly forty additives on retail packaging, not limited to schools. West Virginia signed its own dye restriction in March 2025, ahead of this year's cluster. By the time Iowa, Louisiana, and Tennessee acted in 2026, the National Agricultural Law Center's tracking shows Alaska and New Hampshire had also enacted their own restrictions, with effective dates stretching into 2028. School food dye law is no longer a handful of outlier states. It is a multi-year, multi-state pattern, and Congress has not passed a school-meal-specific dye statute of its own during this period.
That absence is the more unusual part of the story. Coverage of food dye policy in the U.S. has spent a decade comparing FDA rules to EU rules, framing every gap as America versus Europe. That framing does not fit 2026. This year's divergence sits entirely inside U.S. borders. Iowa bans eight substances. Tennessee bans seven, all colors, no other additives. Louisiana's newest action removes one substance from a disclosure law rather than adding anything. A student's school lunch tray is now regulated differently depending on which state line it crosses, and the federal government is not the reason why.
What shows up on a shelf or a cafeteria menu right now depends entirely on which of these effective dates has arrived. Iowa's ban and Tennessee's expanded ban both start with the 2027-28 school year, meaning nothing changes in a Des Moines or Nashville cafeteria this fall. Louisiana's QR-code disclosure requirement, the part meant to put ingredient information in a parent's hand at the point of purchase, does not take effect until the end of 2028. For now, a parent checking a Louisiana product label or a school menu will not yet see the QR codes the 2025 law originally promised, and acesulfame potassium, once slated for disclosure and school restriction, is no longer on either list. Shoppers and school nutrition directors in all three states are, for the next one to two years, operating under the old rules while the new statutes sit on the books waiting for their effective dates.
This is exactly the kind of patchwork PurityIQ exists to make legible. Three states, three different mechanisms, three different clocks, and a fourth and fifth state already added to the list before this article went out. PurityIQ's app pulls the actual bill text, the actual signing date, and the actual effective date for whatever state a reader is standing in, and shows that record next to the product on the shelf. No score, no ranking of which state got it right. Just the record, so the reader can decide what it means for their own kitchen.