A Coalition Targets Colorado's Lead Ammunition Tradition — And It's Not Backing Down
For hunters who chase elk through Colorado's high country or draw coveted pronghorn tags on the Eastern Plains, the bullet they chamber has always been a personal choice governed by physics, budget, and ballistic preference. That calculus may be about to change — whether hunters want it to or not. In early June 2026, a broad coalition of animal welfare advocates, public health organizations, and wildlife management professionals fired a formal shot across Colorado Parks and Wildlife's bow, submitting a legal petition that demands the state's Parks and Wildlife Commission initiate rulemaking to prohibit the use of lead-based ammunition for all sport hunting in Colorado. The debate over what's in your chamber just became a policy fight.
The Petition and Who Is Driving It
A coalition of animal welfare, public health organizations, and wildlife management professionals — including a substantial number of Colorado-based groups — filed a formal petition with the state's Parks and Wildlife Commission (CPW) calling on the agency to initiate rulemaking to prohibit the ongoing use of lead-based ammunition for sport hunting in the state. The move escalates what has been, up until now, a quiet policy conversation playing out mostly in conference rooms and wildlife agency offices into a public, legally binding demand for regulatory action.
Petition signers include Animal Wellness Action, the Center for a Humane Economy, Colorado Voters for Animals, Coalition to Protect America's National Parks, Public Employees for Environmental Responsibility, Arkansas Valley Audubon Society, Black Canyon Audubon Society, Bleating Hearts Sanctuary, Colorado Wild, Colorado Wolf and Wildlife Center, Doggidy Do, Luvin Arms Animal Sanctuary, Rocky Mountain WildHeart Wildlife Rehabilitation Center, Rocky Mountain Wildlife Alliance, Roaring Fork Audubon, and the San Luis Valley Ecosystem Council, among others. The breadth of the coalition — from national lobbying organizations down to local Audubon chapters and wildlife rehabilitation centers — signals a coordinated, well-resourced campaign that CPW cannot dismiss as fringe activism.
Leading the charge is Wayne Pacelle, president of Animal Wellness Action and the Center for a Humane Economy, who has made the elimination of lead ammunition from the American hunting landscape a centerpiece of his organization's mission. "Lead is a potent neurotoxin, and it's been recognized as deadly to humans and other animals for more than 2,500 years," Pacelle said. "Lawmakers and regulators have banned its use in gasoline, paint, plumbing, and other pathways of exposure, and today ammunition discharges by hunters is by far the largest commercial pathway for dispersing lead in the environment."
"Our petition lays out a clear legal and scientific case for regulatory action in Colorado," Pacelle added. That framing — legal and scientific — is deliberate. The petition isn't a plea; it's a framework designed to compel agency action or set up litigation if the agency stalls.
The Science Behind the Push
How Lead Gets Into the Food Chain
The mechanics of how lead enters wildlife populations after a hunting shot are worth understanding in detail, because the pathway is less obvious than it sounds. Most hunters assume the bullet does its damage and stays in the animal. The reality is considerably more complex. Because lead bullets fragment on impact, tiny pieces of lead are left along the bullet's path through the animal, but some can spread much farther. Lead fragments can travel as much as 18 inches away from the main wound channel, making it impossible to remove all lead from the meat or gut pile.
Scavenging wildlife — including eagles, hawks, vultures, and mammals — ingest lead fragments as they pick through gut piles and suffer acute poisoning or long-term neurological damage. Other animals directly consume lead fragments from stream bottoms or in the soil. The damage radiates outward from the kill site in ways that most hunters never witness and would likely find troubling.
There are more than 500 peer-reviewed papers that document mass poisoning of more than 130 species of wildlife that perish from plumbism. That's not a contested figure or an activist talking point — it represents decades of accumulation across ecology, toxicology, and wildlife biology journals. A landmark 2022 study published in Science of 1,210 eagles across 38 states found that nearly half of eagles had bone lead levels consistent with chronic poisoning, and roughly one-third showed evidence of acute exposure. Lead fragments in the remains of hunted animals were identified as a primary driver of these population-level effects.
The Human Health Dimension
The petition doesn't stop at wildlife mortality. Its architects have been deliberate about connecting lead ammunition to the health of the people doing the hunting and the families eating what they bring home. Lead fragments are often so small they go unnoticed during the preparation, cooking, or even chewing of meat. Confirmed lead fragments are found in approximately 20% of ground game meat. That stat alone should give pause to anyone who regularly processes deer or elk, grinds burger from backstraps, or donates excess venison to a food bank.
There should be serious concern about donating deer meat to food banks, where consumers unwittingly consume dangerous levels of lead. Peer-reviewed scientific studies from NIH show there can be a reduction in IQ in children who have been exposed to lead, including lead ammunition, of 5 to 7 or more points, impacting their ability to learn and creating behavioral issues that parents and school systems are left to manage. For hunters who see themselves as providers — men who fill a freezer and feed their families clean protein from the field — this data point has a particular sting.
Colorado's Current Standing: Voluntary and Falling Short
Colorado is not starting from zero on this issue. The state's legislature has already dipped a toe into nontoxic ammunition policy, but the petitioners argue it hasn't gone nearly far enough. In 2023, the Colorado state legislature passed House Bill 23-1036, the "Nontoxic Bullet Replacement Hunting Program." This legislation tasked CPW with working with nongovernmental partners to design a two-year pilot program to encourage hunters to voluntarily switch to lead-free ammunition. The program allows individuals who meet the qualifications to receive vouchers that offset the cost of purchasing hunting rounds with nonlead bullets, focusing on areas where the exposure of wildlife populations to spent lead bullets is of special concern.
By the coalition's assessment, that approach hasn't worked — and it was never going to. The petition filed with CPW calls for a mandatory phaseout since "voluntary programs attract very few participants, have proved to be unscalable, and are no substitute for comprehensive legal standards to compel the transition to widely available, affordable ammunition made from other elements and alloys that does not keep killing long after a round has left the barrel," noted Scott Edwards, the general counsel for Animal Wellness Action and the Center for a Humane Economy.
The frustration with voluntary programs echoes a sentiment that has built over years. "This has been going on since the mid-90s and we're not there. We might not even be getting any closer — and that's disheartening," said one advocate close to the effort. Meanwhile, states such as California and numerous other states have some measure of lead restrictions. Colorado is one of the few states that has none.
The Voice of a Former Hunter and Federal Official
One of the petition's most significant signatures belongs to someone who can credibly speak to the hunting community: Dan Ashe. Ashe, a lifelong hunter and former U.S. Fish and Wildlife Service Director from 2011 to 2017, put his name on the petition and framed the benefits in terms hunters can understand: "Hunters will be using superior and safer ammunition, non-targeted wildlife will be spared needless poisoning, and families and people relying on donated venison will be protected from toxic exposure."
Ashe's involvement matters strategically. The most effective counter-argument gun rights groups deploy against lead ammunition bans is that they're being pushed by people who have never hunted and don't understand hunting — that the real agenda is eliminating hunting altogether by restricting the gear. Ashe, as a lifelong hunter who spent years directing the nation's top wildlife agency, is not a clean fit for that narrative.
Colorado Voters for Animals also weighed in through spokesperson Andrea Metzer. "Coloradans greatly value wildlife and appreciate the importance of wildlife and wild spaces to our economy. Given all the pressures that wildlife in Colorado are now facing, it is long past time to stop poisoning them with lead ammunition. There is no justification for continuing to introduce a potent neurotoxin into the environment, threatening both wildlife and human health, when alternatives are readily available," Metzer said.
Historical Precedent: The 1991 Waterfowl Ban
The petition's architects lean hard on one historical parallel: the 1991 federal ban on lead shot for waterfowl hunting, because it is the clearest evidence available that hunters adapt and wildlife recovers. In 1991, the U.S. Fish and Wildlife Service mandated an end to the use of lead ammunition in hunting ducks, geese, and other waterfowl. When this ban went into effect — long before there were online sales of ammunition allowing hunters to purchase in the national marketplace in two or three days — hunters made the transition to lead-free shot for waterfowl hunting in all 50 states.
The outcome of that policy is now well-documented. The policy saves 1.4 million to 3.9 million ducks and geese annually, with more abundant waterfowl populations enhancing hunting success rates for hunters and hunting guides. That last detail is one the coalition emphasizes deliberately: a healthier bird population benefits the very hunters whose tradition might feel threatened by a mandate. Within 10 years of the waterfowl ban, researchers found significant improvements in blood and bone lead levels in a variety of waterfowl species. The use of nontoxic shot reduced the mortality of mallards by 64 percent and saved approximately 1.4 million ducks in a single fall flight.
The waterfowl ban also has a market lesson embedded in it. The price of non-lead shot fell after the federal government banned lead shot in waterfowl hunting more than three decades ago — a reminder that regulatory mandates drive manufacturing investment and supply chain expansion, which in turn drives prices down. The steel and bismuth shot markets that now supply waterfowl hunters nationwide were built largely in response to that regulatory pressure.
California's Full Ban: The Template Being Studied
California enacted a statewide ban on lead ammunition for hunting in 2013, and it's been a great success story in protecting California condors and dozens of other species in the state. That policy was phased in and now is in place for all 60 species legally hunted in the state. California's condor population — a species that came within whiskers of extinction and whose recovery has been one of American conservation's most expensive and painstaking efforts — has benefited measurably from removing lead contamination from its food supply. The condor feeds heavily on carcasses and gut piles, making it exquisitely vulnerable to hunter-dispersed lead fragments.
Whether Colorado follows California's path will depend heavily on how CPW responds to the petition and how much political pressure the hunting industry, firearms lobby, and gun rights organizations bring to bear in opposition.
The Opposition Case: Cost, Availability, and a Question of Motives
The petition's arguments have not gone unanswered. Hunters and shooting sports enthusiasts who have engaged with this debate raise legitimate practical concerns that deserve fair treatment.
Gun rights and hunting groups argue that non-hunters push these bans as a first step to restricting hunting more widely. They also say alternatives like copper bullets are more expensive and harder to find. The cost concern is real, if diminishing. Premium copper hunting loads from manufacturers like Barnes, Nosler, and Federal have historically carried price premiums over standard lead-core ammunition, though the gap has narrowed as demand has grown.
The availability picture across different platforms is uneven. Lead-free ammunition for centerfire cartridges is fairly available and ballistically sufficient. Lead-free for shotgun rounds is considerably more challenging unless you're turkey hunting, making upland hunting significantly more expensive. Lead-free rimfire options are essentially nonexistent. That last point is a real sticking point for small-game hunters and target shooters — .22 LR is the most commonly purchased cartridge in the country, and lead-free options in that caliber remain scarce and expensive.
CPW's own materials offer a more nuanced price picture for centerfire rifle hunters specifically. Mid- and top-tier rifle ammunition, whether lead or lead-free, are comparable in price. Lead-free ammunition, both as loaded ammunition and bullets for reloading, is available in all popular calibers through many manufacturers and is often available at local stores and online. For the elk hunter loading a bolt-action .30-06, the transition is a practical one. For the pheasant hunter working through three boxes of 12-gauge shells on a South Dakota weekend, the equation looks different.
Amid the back-and-forth, some conservation and hunting groups have turned to voluntary programs instead, and argue these methods are more effective in convincing hunters to make the switch. That position holds that regulatory mandates breed resentment and resistance, while education and incentive-based approaches build genuine buy-in from within the hunting community. The counter-argument — laid out explicitly in the Colorado petition — is that voluntary programs simply haven't moved the needle fast enough given the scale of the ecological and human health problem.
The Federal Picture: A History of Reversals
The political history of lead ammunition at the federal level is a cautionary tale for anyone expecting a clean resolution in Colorado or anywhere else. On the final day of the Obama Administration, the U.S. Fish and Wildlife Service announced that lead ammunition would be banned on federal lands five years later. But on his first day serving as Interior Secretary in the first Trump Administration, Ryan Zinke ordered that ban reversed. That reversal illustrated how vulnerable such policies are to political winds at the federal level — which is part of why advocates have increasingly shifted to a state-by-state strategy.
More recently, the federal posture on the issue has remained cautious. A final rulemaking followed up on a June 2023 proposed action when the federal agency announced it would phase out lead ammunition on just eight national wildlife refuges out of more than 400 allowing sport hunting. For organizations like Animal Wellness Action, that pace is unconscionable given the scale of documented wildlife poisoning. The state-level petition strategy — filing in Colorado now, following an earlier filing in New York in March 2026 — reflects a calculation that durable change will be built from the states up rather than the federal government down.
What Colorado Parks and Wildlife Must Now Do
The formal petition puts CPW in a position it cannot simply ignore. Under Colorado administrative law, a petition for rulemaking requires the agency to formally respond — it must either initiate rulemaking or explain why it declines to do so. The petitioning organizations have made clear they are not treating this as an opening suggestion. The organizations stated that if the agency declines to act on the petition or unreasonably delays rulemaking, they are prepared to pursue all available legal remedies to ensure that the public trust in wildlife is upheld and that preventable lead exposure is addressed. That is litigation language, and it signals that this is a multi-year campaign with legal resources behind it.
CPW's existing posture has been measured. The agency has supported outreach and voluntary transition programs, and in fall 2025 it surveyed a targeted sample of deer and elk rifle hunters on their use and opinions of lead-free ammunition, with a report available in 2026. No new regulations on lead ammunition had been enacted as of that report's release — a status quo the petitioners are now formally challenging.
What It Means for Colorado Hunters
Colorado's hunting culture is not monolithic. The state draws a full spectrum — from out-of-state trophy hunters chasing giant mule deer in the Book Cliffs, to local ranchers filling tags on their own land, to public-land elk hunters who spend a year preparing for a week in the backcountry, to youth hunters on their first deer. What a lead ammunition ban would mean varies considerably depending on where a hunter falls in that spectrum.
For rifle hunters pursuing big game, the transition to copper or copper-alloy projectiles is increasingly straightforward. The ballistics are proven, the performance in terminal expansion is well-documented, and the price difference at the premium end of the market has shrunk considerably. Non-lead ammunition such as copper and copper-alloy projectiles is widely available at brick-and-mortar gun and ammunition stores and through online sales channels, and these forms of ammunition perform effectively in the field and are competitive on cost. The U.S. Army is switching to copper rounds for its massive fighting force, a development that speaks to both the technology's maturity and the scale of demand that will drive manufacturing efficiencies going forward.
For upland hunters and small-game hunters, the path is harder. The shotgun shell market for lead-free upland loads — pheasant, grouse, dove — is less developed and meaningfully more expensive. Any rulemaking that emerges from CPW will likely need to account for these differences, potentially through a phased approach that addresses rifle hunting for big game first and works toward shotgun and rimfire applications over a longer timeline. California's approach of phasing in the ban species by species over several years offers one model for how that could work in practice.
The Broader Movement: Colorado as a Domino
The Colorado petition doesn't exist in isolation. Animal Wellness Action and its allies have been deliberately filing in multiple states, treating each petition as both an independent effort and a building block in a national strategy. Animal Wellness Action, the Center for a Humane Economy, key Audubon organizations across New York, and more than 15 other organizations filed a formal petition with New York's State Department of Environmental Conservation in March 2026, calling for the same rulemaking in that state. The dual-state strategy makes it harder for any single state agency to dismiss the push as a local aberration, and it creates legal and political precedents that can cascade.
California is the only state to fully ban lead ammunition, starting in 2019. But advocacy groups have raised the issue recently in other states, including Maryland, where the legislature considered bills this year that ultimately failed. The Colorado petition represents a shift in tactics — rather than going through a legislature that can be lobbied against by firearms industry groups, the coalition is using the administrative petition process to demand agency rulemaking, a pathway that is harder to block through traditional political channels and easier to enforce through litigation.
Colorado is one of the few states that has no lead restrictions of any kind. The United States is quite far behind other countries that have successfully implemented full or partial bans with minimal disruption to hunting or angling communities. That framing — that Colorado is an outlier and the rest of the developed world has already moved on — is designed to shift the burden of proof onto opponents of the ban to explain why Colorado should remain an exception.
The Bottom Line for Anyone Who Hunts
Whatever one thinks of the politics, the science underpinning this campaign has been building for decades and is not seriously contested in the peer-reviewed literature. Lead is toxic. It fragments widely. It enters the food chain through gut piles, contaminating scavengers from eagles to coyotes, and it shows up in the meat that hunters and their families eat. The question before Colorado Parks and Wildlife is not whether lead causes harm — that much is settled — but whether the magnitude of that harm, weighed against the practical disruptions a mandate would impose on hunters, justifies a regulatory response rather than continued voluntary education.
For hunters who care about long-term elk and deer populations, healthy raptor populations, and the reputation of hunting as an ecologically responsible activity, the lead question is one worth engaging honestly. The organizations behind this petition have made clear that patience with voluntary approaches is exhausted, that legal tools are ready to be deployed, and that Colorado is now firmly in their sights. The next move belongs to CPW — and to the hunters, guides, and shooting sports community who will need to make their voices heard in whatever rulemaking process follows.
