Raw milk is illegal to sell across state lines in the United States because it can carry dangerous bacteria that pasteurization would otherwise kill. Federal law, codified under food safety regulations tied to communicable disease control, prohibits shipping unpasteurized milk in interstate commerce. The reasoning is straightforward: raw milk causes a disproportionate share of dairy-related illness despite being consumed by a tiny fraction of the population.
The Federal Ban on Interstate Sales
The FDA’s regulation is specific: no person shall sell, distribute, or hold for sale in interstate commerce any milk or milk product intended for direct human consumption unless it has been pasteurized. The rule sits within the federal code’s section on controlling communicable diseases, which signals how regulators view raw milk: not as a food preference issue, but as a public health one.
This federal rule only covers milk crossing state lines. What happens within a state’s borders is up to that state, which is why the legal landscape varies so widely depending on where you live.
The Bacteria That Drive the Restrictions
Raw milk can harbor Salmonella, E. coli, Listeria, Campylobacter, and the organisms responsible for tuberculosis, typhoid fever, brucellosis, and Q fever. These aren’t theoretical risks. Pasteurization was specifically developed in 1864 to eliminate them.
For most healthy adults, exposure to these pathogens means a few days of vomiting, diarrhea, fever, and body aches. But for pregnant women, young children, older adults, and anyone with a weakened immune system, the consequences can be severe. Listeria, commonly found in raw milk, can cause miscarriage or death in newborns. Some people develop chronic symptoms or life-threatening complications even after the initial infection clears.
A more recent concern has added urgency to the debate. Highly pathogenic avian influenza (H5N1) has been detected in unpasteurized milk collected from both visibly sick and symptom-free dairy cattle. Mouse studies suggest a real infection risk from consuming contaminated milk, and the CDC has noted that the virus could theoretically bind to receptors in the human respiratory tract if swallowed or aspirated. The full risk to humans is still being studied, but the presence of a potentially dangerous virus in raw milk supply chains has reinforced regulators’ caution.
How the Numbers Stack Up
The single most cited statistic in the raw milk debate comes from a CDC analysis covering 2009 to 2014. Only about 3.2% of the U.S. population drinks unpasteurized milk, and only 1.6% eats unpasteurized cheese. Yet those products were responsible for 96% of all illnesses caused by contaminated dairy. Per serving, unpasteurized dairy causes roughly 840 times more illnesses and 45 times more hospitalizations than pasteurized products.
That ratio is what regulators point to when justifying restrictions. The risk per glass isn’t enormous for any single person on any given day, but scaled across a population, unpasteurized dairy is orders of magnitude more dangerous than pasteurized dairy.
Why Pasteurization Became Standard
Before pasteurization was widespread, milk was one of the most dangerous things in the American diet. In 1840s New York City, half of all children died before age five, and milk-borne disease was a leading cause. City cows were often fed industrial waste, and the resulting “swill milk” was described as blue-tinted, lumpy with dirt, and swarming with bacteria that caused tuberculosis, cholera, and severe digestive illness. Between 1901 and 1905, nearly two out of every ten New York children died before their first birthday, a rate worse than exists today even in the least developed nations.
Pasteurization changed that calculus dramatically. The process is simple: heat milk to a specific temperature for a set period of time to kill harmful organisms. The most common method used today heats milk to 161°F (71.7°C) for just 15 seconds. An older technique holds milk at 145°F (62.8°C) for 30 minutes. Both achieve the same goal. The dramatic decline in childhood mortality from dairy-related illness over the 20th century is one of the clearest public health success stories in modern history.
What Pasteurization Actually Changes in Milk
Advocates for raw milk often claim pasteurization destroys valuable nutrients and enzymes. The FDA has addressed these claims directly, and the data is more nuanced than either side typically acknowledges.
Vitamin C does decline with pasteurization, dropping roughly 15 to 17% under standard processing. But milk is a negligible source of vitamin C to begin with. A full cup contains only about 5 milligrams, a fraction of what you’d get from a single orange. The vitamins people actually rely on milk for, like riboflavin, B6, and B12, are heat-stable and survive pasteurization well.
Some enzymes are destroyed or reduced. Lipase activity is largely eliminated. But others are surprisingly resilient. Xanthine oxidase, one of the most heat-stable enzymes in milk, loses less than 10% of its activity even at temperatures above standard pasteurization. Plasmin retains 30 to 40% of its activity even after ultra-high-temperature processing. The blanket claim that pasteurization “kills” all beneficial enzymes doesn’t hold up under scrutiny, though specific enzymes are certainly affected.
Where Raw Milk Is Legal
As of recent data, 38 states allow some form of raw milk sale within their borders. Thirteen of those permit retail store sales, while 25 allow on-farm purchases or cow-share agreements. The remaining states ban raw milk sales entirely.
States that do permit sales often impose strict safety standards. California, for instance, requires that raw milk at the point of delivery contain no more than 15,000 bacteria per milliliter and no more than 10 coliform bacteria per milliliter. These limits are far tighter than what’s required for milk headed to a pasteurization plant, because there’s no kill step coming later.
How Herd Shares Work Around the Law
In states where selling raw milk is illegal, some consumers use a legal workaround called a herd share. The logic is simple: you can legally drink milk from an animal you own. A herd share lets you buy partial ownership of a cow or goat, and then pay the farmer a monthly fee for boarding, feeding, and milking your animal. You’re not buying milk. You’re receiving milk from livestock you technically own.
This structure shifts liability from the farmer to the consumer. The farmer is providing animal husbandry services, not selling a food product. In Texas, for example, selling raw milk is illegal, but drinking milk from your own animals is perfectly legal. Herd shares exploit that distinction. Whether regulators view these arrangements favorably varies by state, and some have moved to close the loophole while others tolerate it.
Why the Debate Persists
The tension around raw milk isn’t purely about safety data. For many consumers, it’s about food autonomy: the belief that individuals should decide what risks they’re willing to take with their own diet. Raw milk advocates also point to taste differences, the desire to support small local farms, and a general skepticism of industrial food processing.
Regulators counter that foodborne illness doesn’t stay contained. Sick individuals strain healthcare systems, and children in households that consume raw milk don’t get to make informed choices for themselves. The 840-fold difference in illness rates between raw and pasteurized dairy is, from a public health standpoint, difficult to dismiss. That gap is why the federal ban exists and why most states that allow sales impose strict testing requirements and limit where and how raw milk can be sold.