Lead shot is illegal for waterfowl hunting because ducks, geese, and other waterbirds swallow spent pellets while feeding, and as few as one or two ingested pellets can be fatal. The U.S. banned lead shot for waterfowl hunting nationwide in 1991 after decades of evidence that millions of birds were dying from lead poisoning each year. The ban requires hunters to use non-toxic alternatives like steel, bismuth, or tungsten shot instead.
How Waterfowl Ingest Lead
Waterfowl are bottom feeders. Ducks and geese dabble in shallow water and mud, sifting through sediment for seeds, aquatic plants, and grit. They deliberately swallow small hard objects to help their gizzards grind food, much like a bird version of chewing. Spent lead pellets sitting on the bottom of a marsh or lake look and feel exactly like the grit and seeds these birds are already searching for.
Once swallowed, the pellet enters the gizzard, where muscular contractions grind it into tiny particles. Gastric juices dissolve those particles into lead salts, which pass directly into the bloodstream. The bird’s own digestive system, designed to crush hard seeds, becomes the mechanism that poisons it. A single number-six lead pellet weighs a fraction of a gram, but that’s enough lead to kill a mallard.
What Lead Poisoning Does to Birds
Lead is a potent neurotoxin that affects virtually every organ system. Poisoned waterfowl show incoordination, weakness, drooped wings, loss of appetite, reduced activity, and green watery diarrhea. Birds that have ingested lead often become too weak to fly or feed, making them easy targets for predators. In many cases, the bird simply starves to death because it stops eating.
The damage isn’t limited to birds that swallow pellets directly. Bald eagles, golden eagles, and other scavengers feed on waterfowl carcasses and gut piles left in the field. A U.S. Geological Survey study found that almost 50 percent of bald and golden eagles sampled showed evidence of repeated lead exposure. Eagles rely heavily on dead animals as a food source during winter months when live prey is scarce, and lead fragments in those carcasses accumulate over time. This secondary poisoning pathway means the problem extends well beyond the marsh.
The Scale of the Problem
Before regulations took effect, the numbers were staggering. Researchers estimate that roughly 700,000 waterbirds of 16 species die annually in the European Union alone from lead poisoning, representing about 6 percent of the wintering population. Across all of Europe, that figure rises to about one million birds per year. Three times as many birds suffer sub-lethal effects: organ damage, weakened immune systems, and impaired reproduction that don’t kill outright but reduce survival and breeding success.
In the UK, where restrictions have been slower to take hold, an estimated 50,000 to 100,000 wildfowl die each winter from lead poisoning, with several hundred thousand more experiencing sub-lethal effects. These figures illustrate why the U.S. moved to act, and why the issue remains urgent in countries where enforcement is weaker or regulations are newer.
How the U.S. Ban Came Together
The federal ban didn’t happen overnight. The U.S. Fish and Wildlife Service used its authority under the 1918 Migratory Bird Treaty Act, which gives the agency power to regulate how migratory birds are hunted. Starting in the 1970s, the agency identified “hot spots,” areas with heavy waterfowl use and high concentrations of spent shot in the sediment, and restricted lead in those zones first.
When localized restrictions proved insufficient, the International Association of Fish and Wildlife Agencies proposed a five-year phaseout beginning in 1986. By the 1991-92 hunting season, lead shot was banned nationwide for all waterfowl hunting. The regulation applies specifically to shotgun ammunition containing lead pellets used to hunt waterfowl and other water-related migratory birds. Hunters can still legally use lead shot for upland game birds like pheasant and quail in most states, though some states have enacted broader restrictions.
International Restrictions
The U.S. was the first major country to implement a nationwide ban, but others have followed. As of February 2023, the European Union prohibits discharging or even carrying lead shot within 100 meters of wetlands. The EU regulation was adopted under the REACH framework, which governs chemical safety across member states. Denmark, the Netherlands, and several other European countries had already enacted their own bans before the EU-wide rule took effect.
Canada banned lead shot for migratory game bird hunting in 1999. Australia, New Zealand, and several other countries have partial or full restrictions in place. The trend is clearly toward broader bans, with some jurisdictions now considering restrictions on lead ammunition for all hunting, not just waterfowl.
Why Steel and Other Alternatives Work
Steel shot was the first widely available alternative, and it remains the most common and affordable option. Early steel loads in the 1980s and 1990s earned a poor reputation for reduced range and inconsistent patterns, but modern steel ammunition has improved dramatically. Most waterfowl hunters today find steel performs well at typical hunting distances when they adjust shot size up by one or two numbers to compensate for steel’s lighter weight compared to lead.
Bismuth and tungsten-based shot offer ballistic performance closer to lead, with similar density and energy at range. These options cost significantly more per box, but they appeal to hunters using older shotguns that weren’t designed for steel (steel is harder and can damage thin-walled barrels in some vintage guns). The key point is that all approved non-toxic alternatives break down in the environment without releasing toxic metals into the food chain.
The ban on lead shot for waterfowl hunting exists because the biology leaves no room for ambiguity. Waterbirds feed in exactly the places where spent shot accumulates, their digestive systems are built to grind hard objects, and the resulting lead absorption is efficient and lethal. With viable non-toxic alternatives widely available, the trade-off between tradition and conservation was ultimately straightforward.