When highly pathogenic avian influenza (HPAI) reaches a poultry farm, the emergency does not end when birds are depopulated. Millions of carcasses, along with litter, manure, feed, eggs, protective equipment, wastewater, and contaminated equipment, must be contained and treated quickly. Composting and disposal in a permitted landfill are among the preferred options in U.S. guidance, but both require careful site selection, transport, monitoring, and regulatory oversight.
The concern is therefore real—but it is important to separate two issues. Culling is primarily a disease-control measure intended to stop HPAI from spreading through poultry and to nearby premises. Disposal is a separate environmental and logistical problem. A properly designed compost pile or permitted landfill can help control the virus, while a flooded, poorly managed, or improperly sited disposal area can create odor, flies, runoff, leachate, groundwater concerns, worker exposure, and public distrust.
People living near poultry farms or carcass-disposal sites may reasonably ask what happens after chickens are killed during a bird-flu outbreak. Are the carcasses composted, buried, burned, rendered, or sent to a landfill? Can those methods spread H5N1? Are nearby residents at risk? And does the disposal of infected flocks make store-bought chicken or eggs unsafe?
The short answer is that there is no single disposal method suitable for every outbreak. Officials weigh the number and weight of birds, available land and carbon material, groundwater and drainage conditions, transport distances, landfill or rendering capacity, air-quality rules, biosecurity, cost, and state requirements. Large incidents often require several methods at once.
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Outside the United States, preferred methods and legal requirements differ according to national veterinary, environmental, and waste-management authorities. The framework below focuses on the United States.
The Palmyra, Wisconsin, case shows why disposal has become controversial
A May 4, 2026 report described continuing odor and fly complaints from residents near Palmyra, Wisconsin, where millions of chickens killed during avian-flu outbreaks were being composted. The report said the Wisconsin Department of Natural Resources (DNR) issued a Notice of Noncompliance on April 23 after finding that some windrows were underwater and did not meet composting performance standards. The material could not be spread on fields until the operator demonstrated that it had reached the required maturity and pathogen-reduction standards, according to the report.
This case should not be treated as proof that every HPAI composting site fails. It does show, however, that an emergency disposal site can be epidemiologically appropriate and still have environmental or operational problems. A site may be authorized as part of an animal-disease response while particular windrows, drainage controls, temperature records, or land-application plans remain out of compliance.
Wisconsin DNR’s general guidance says carcass-composting sites must operate in a nuisance-free and environmentally sound manner, monitor temperatures, and prevent nutrients from reaching groundwater or nearby surface waters. Farm carcass composting remains subject to state law and performance standards; federal animal-health approval does not automatically replace those environmental requirements. See Wisconsin DNR’s composting and recycling guidance.
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A June 2026 Jefferson County board packet described an even larger local burden, reporting that 7.9 million chicken carcasses had been composted on the same 19 acres of windrows within six months and that more than 10.6 million chickens had been euthanized and composted at one parcel since 2022. Those figures should be understood as figures presented in the county packet, not independently audited national statistics. The packet also raised concerns about carbon-material demand, truck traffic, and the long-term management of the site.
Why are chickens culled instead of treated?
HPAI is different from low-pathogenic avian influenza (LPAI). HPAI can spread rapidly through a flock and cause severe disease and death. According to the USDA Animal and Plant Health Inspection Service (APHIS), there is no treatment for HPAI in poultry. Affected and exposed poultry are therefore depopulated as part of the response.
That does not mean every bird in a depopulated flock individually tested positive. Some birds are removed because they were exposed, housed with infected birds, or epidemiologically linked to the affected premises. The goal is to remove opportunities for the virus to continue multiplying and moving to other poultry or farms.
APHIS says LPAI may sometimes be managed with measures other than full depopulation, such as quarantine or controlled marketing, depending on the strain, circumstances, and regulatory decision. “Culling” is the familiar public term, but officials generally use depopulation for the emergency removal of a large number of animals to control disease. Euthanasia emphasizes minimizing suffering for individual animals. During a mass outbreak, emergency disease control may require methods that can be carried out quickly across a very large flock rather than conventional individual-animal procedures.
USDA’s response goal is to complete depopulation within 24 hours of detection when feasible. That is an operational target, not a guarantee that every outbreak meets it. USDA guidance identifies water-based foam and carbon dioxide as humane and effective options for large flocks under emergency conditions. Other methods, including ventilation shutdown-plus, may be considered when preferred methods cannot meet the response timetable. The relevant USDA depopulation and disposal guidance explains the emergency context and method choices.
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What happens after a flock is depopulated?
The response is a chain of decisions rather than a single event:
- Detection and confirmation: Veterinary authorities investigate sick or dead birds and test for avian influenza.
- Quarantine and movement controls: The affected premises and, where necessary, nearby premises are restricted to reduce spread through birds, people, vehicles, equipment, litter, and other materials.
- Depopulation: Affected and exposed poultry are removed under federal and state supervision.
- Temporary containment: If carcasses cannot be treated immediately, they may need covered, leak-resistant temporary storage. Depopulation speed must be balanced with the available capacity to move and dispose of the carcasses.
- Disposal planning: Officials assess bird numbers, carcass weight, space, carbon supplies, equipment, truck capacity, landfill or rendering distance, and incinerator availability.
- Transport, if necessary: Carcasses and contaminated materials leave the farm only through a controlled route using closed, leak-resistant containers or trucks and appropriate biosecurity procedures.
- Treatment or final disposal: Material may be composted, landfilled, buried, rendered, or incinerated, depending on site and regulatory conditions.
- Cleanup and monitoring: Barns, vehicles, tools, protective equipment, wastewater, litter, feed, eggs, and manure may all require controlled handling, cleaning, disinfection, testing, monitoring, and eventual release or land application.
APHIS carcass-management planning guidance emphasizes that large incidents commonly require more than one disposal method. A farm may have enough space to compost some carcasses but need a landfill, renderer, or incinerator for the remainder.
How mortality composting is supposed to work
HPAI mortality composting is not ordinary backyard composting. It is a controlled biological treatment process that requires trained personnel, heavy equipment, a large supply of porous carbon material, water, temperature monitoring, biosecurity, and approval from the relevant authorities.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11In the USDA HPAI mortality-composting protocol, a typical outdoor windrow is approximately:
- 6–8 feet high and 12–15 feet wide;
- built over a porous carbon base generally 10–15 inches thick;
- constructed with a well-mixed carcass-and-carbon core using at least a 1:1 mix by volume in the cited protocol; and
- covered by an 8–12-inch carbon cap so carcasses are not exposed.
The carbon material may include suitable wood chips, sawdust, straw, litter, or similar material, depending on the approved plan. It absorbs fluids, creates air spaces, helps control odor, and supplies the carbon needed for biological activity. A property can have plenty of acreage and still be unsuitable if it cannot obtain enough absorbent carbon quickly.
The cited USDA protocol also says:
- carcasses should not be ground, crushed, or macerated while the windrow is being built;
- temperatures should be monitored daily after the composting operation is approved;
- the windrow should not be turned before the end of the initial 14-day composting period; and
- a second 14-day phase follows, with release dependent on evaluation and approval rather than simply the passage of time.
The protocol uses 131°F as an operational troubleshooting threshold. It also treats moisture below 40% as too dry and moisture above 60% as too wet. These figures are useful process controls, but they are not a universal legal guarantee that every pathogen has been eliminated. A temperature reading in one part of a pile cannot, by itself, prove that an entire windrow has achieved pathogen reduction. The USDA HPAI mortality-composting protocol says procedures may be revised and does not replace state permits, incident-specific instructions, or professional supervision.
Common composting failures
| Failure | What can happen | Typical corrective approach |
|---|---|---|
| Pile is too dry | Biological activity slows and temperatures fail to rise | Add water and mix if necessary |
| Pile is too wet | Leachate forms, air movement declines, and temperatures may remain low | Add carbon, improve drainage, and mix when authorized |
| Insufficient oxygen | Anaerobic pockets create odor and reduce effective composting | Aerate or mix according to the approved protocol |
| Carcasses are exposed | Odor, flies, rodents, scavengers, and potential spread of contaminated material increase | Add and maintain the required carbon cap |
| Site is poorly chosen | Runoff, flooding, groundwater concerns, and nuisance complaints become more likely | Use site controls or relocate material when regulators approve |
| Windrow is turned or released too early | Decomposition or pathogen reduction may be incomplete | Require documented temperature history and official or subject-matter-expert approval |
What environmental problems can disposal create?
Carcass disposal is a waste-management problem as well as a disease-control problem. During decomposition, carcasses can release bodily fluids, biological and chemical leachate, and gases such as methane. Without adequate drainage and containment, those materials can enter stormwater, surface water, or groundwater.
The main concerns include:
- Odor: Decomposition, ammonia, anaerobic areas, and exposed carcasses can produce persistent odors. Odor alone does not prove H5N1 transmission, but it can indicate a nuisance or a process-management failure.
- Flies, rodents, and scavengers: These animals can make a site unacceptable to neighbors and may move contaminated material or visit poultry premises.
- Leachate: Nutrient-rich and biologically contaminated liquid can leave a pile or burial area, particularly during heavy rain or flooding.
- Stormwater runoff: Water flowing across the site can carry organic matter, nutrients, or contaminated sediment into ditches and streams.
- Groundwater contamination: The risk depends on soil, bedrock, water-table depth, liners, drainage, and the presence of wells. It is not appropriate to assume that every compost site has contaminated groundwater, but it is legitimate to ask how groundwater protection is being verified.
- Air emissions: Composting can generate ammonia and methane. Incineration and open burning create separate smoke and air-pollution concerns.
- Traffic and material demand: Large windrows require enormous amounts of carbon, heavy equipment, and sometimes repeated truck trips on public roads.
- Long-term management: Unfinished compost cannot necessarily be moved to fields, and burial sites may require future monitoring and restrictions on land use.
EPA identifies properly managed composting and disposal in a permitted landfill as preferred broad options because they can contain the virus while limiting environmental impacts. It also warns that improper carcass management can cause odor, public controversy, environmental cleanups, and legal liability. EPA’s carcass-management guidance discusses leachate, methane, groundwater, surface water, air pollution, and monitoring.
Where can a compost site be located?
USDA’s HPAI composting protocol gives general siting recommendations intended to reduce water and nuisance risks. It recommends avoiding flood plains and, where appropriate, using a gentle 2%–4% slope. The protocol also recommends:
- more than 24 inches of soil above the seasonal high water table;
- more than 36 inches of soil above bedrock;
- at least 200 feet from drinking-water wells;
- at least 200 feet from water bodies;
- at least 200 feet from a nearby residence not owned by the poultry premises;
- at least 50 feet from a drainage swale leading to a water body; and
- at least 25 feet from a drainage swale that does not lead to a water body.
These are protocol recommendations, not a universal set of setbacks for every state. State environmental rules, local site conditions, permits, and incident-specific orders control. High water tables, shallow bedrock, karst geology, flood-prone land, or a nearby private well may make a proposed site inappropriate even if it meets a general distance guideline. The full USDA protocol provides the cited siting criteria.
Is burial safer than composting?
Neither method is automatically safe or unsafe. The answer depends on the site, the engineering, the volume of material, and the controls imposed by regulators.
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On-site burial
Burial can reduce long-distance transport and may be deployed quickly where suitable land exists. But carcasses underground can create leachate and groundwater risks. Flooding, shallow bedrock, karst, a high water table, poor soil, or nearby wells can make burial unsuitable. Carcasses may also rise to the surface, and the location can create long-term monitoring and future land-use complications.
EPA says burial remains possible in some incidents but presents site-specific contamination risks. APHIS also cautions that above-ground burial or shallow burial with carbon has not been proven for all diseases and requires state approval where used. “Bury it on the farm” is therefore not a universally available solution. See APHIS’s current carcass-management information and EPA’s environmental guidance.
Permitted landfills
A permitted landfill may offer engineered containment, daily cover, leachate collection, and capacity for very large volumes. It still has limitations: the facility may refuse HPAI material, state regulators may impose special requirements, available capacity may be limited, and transport creates its own biosecurity and public-road concerns.
State environmental regulators generally determine requirements involving liners, leachate systems, gray-water management, cover schedules, permits, and operating procedures. APHIS recommends that HPAI waste be moved in closed, leak-resistant containers or trucks. The APHIS landfill-disposal policy explains these requirements and the role of state regulators.
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Rendering can recover value from animal material and is used for routine farm mortalities in some state guidance. It is not an automatic destination for birds from an HPAI premises. Before material is transported, officials and operators need to verify that:
- the facility is listed or approved to receive the relevant material;
- the renderer will accept infected or exposed poultry during the outbreak;
- required permits or interstate-movement approvals are in place;
- the route will not create unacceptable biosecurity risks for other poultry premises; and
- the plant has enough capacity for the outbreak volume.
APHIS publishes lists of approved or listed slaughter and rendering establishments and describes the federal requirements that apply to facilities receiving animals for rendering.
Why not incinerate everything?
Incineration can destroy carcasses and the virus, but equipment, fuel, capacity, air permits, location, cost, and ash disposal limit its use.
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- Fixed permitted incinerators have emission controls and regulatory oversight, but there may not be enough capacity close to the affected farms.
- Mobile or air-curtain incinerators may help during emergencies, but they depend on equipment availability, fuel, location, and regulatory approval.
- Open pyres or open burning have uncontrolled emissions and raise greater concerns about smoke, air quality, ash, and public acceptance. They should not be treated as equivalent to a permitted incinerator.
EPA’s carcass-management guidance distinguishes controlled incineration from open burning. At very large flock sizes, composting may be faster, more practical, or less fuel-intensive than incineration, but that does not make poorly managed composting acceptable.
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Exposure is possible, but risk is not uniform. The people at greatest risk are those who have close contact with infected or exposed birds and contaminated materials, including:
- poultry workers and depopulation crews;
- carcass-removal and disposal workers;
- landfill and rendering workers handling contaminated loads;
- veterinarians, animal-health officials, and emergency responders;
- people cleaning barns, equipment, litter, vehicles, and protective equipment; and
- backyard-flock owners handling sick or dead birds.
CDC recommends avoiding unprotected contact with sick or dead animals, carcasses, feces, litter, and contaminated materials. For people who must work close to potentially infected animals or material, CDC recommends properly fitted eye protection, gloves, boots or boot covers, fluid-resistant coveralls or equivalent protective clothing, and a NIOSH-approved particulate respirator such as an N95. Exposed people should monitor for respiratory symptoms or conjunctivitis for 10 days after their last exposure. Details are available in CDC’s interim recommendations for people exposed to HPAI.
OSHA says employers should conduct a task-specific hazard assessment and provide appropriate engineering controls, safe work practices, training, personal protective equipment, hand hygiene, and a compliant respiratory-protection program when respirators are required. See OSHA’s avian-flu workplace guidance.
For an ordinary nearby resident, the appropriate response is not to approach carcasses, litter, runoff, or contaminated equipment. Odor alone is not evidence of H5N1 infection. A fly or odor complaint can nevertheless point to a genuine waste-management or quality-of-life problem. Human infection requires epidemiological or laboratory evidence; it should not be inferred from proximity, smell, or an unconfirmed symptom.
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Current U.S. human-health picture
As of a CDC surveillance update dated August 7, 2026, the agency reported no indicators of unusual influenza activity in people, including A(H5). CDC reported that between February 2022 and August 1, 2026, at least 33,200 people had been monitored and at least 1,340 had been tested after exposure to infected animals. That finding argues against describing disposal sites as evidence of a general human outbreak, but it does not eliminate occupational risk for people handling infected birds or contaminated waste. Check the CDC H5 monitoring page for updates because surveillance results can change.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does this make store-bought chicken or eggs unsafe?
No—not by itself. The disposal of carcasses from infected or exposed flocks does not mean that all poultry entering stores is unsafe. Birds from affected flocks are removed from production and handled through disease-control and disposal channels. The Food Safety and Inspection Service says diseased poultry carcasses are unfit for human food and condemned; see its poultry-processing questions and answers.
CDC says there is no evidence that anyone in the United States has been infected by eating properly handled and cooked poultry products. Cooking poultry and eggs to an internal temperature of 165°F kills bacteria and viruses, including avian influenza viruses. Consumers should still avoid raw or undercooked poultry and eggs, prevent cross-contamination, wash hands and food-contact surfaces after handling raw poultry, and follow the CDC food-safety guidance.
Which agency is responsible?
Responsibility is divided among several agencies:
- USDA and APHIS: Animal-health response, disease-control policy, depopulation guidance, biosecurity, indemnity, and federal carcass-management guidance.
- State agriculture or veterinary agencies: Quarantine orders, animal-health decisions, premises controls, and coordination of the outbreak response.
- State environmental agencies: Composting, burial, landfill, runoff, groundwater, surface-water, air-quality, waste, and nuisance compliance.
- CDC and state or local health departments: Human-exposure monitoring, testing, and public-health response.
- OSHA: Worker-safety requirements and guidance for employers.
- Local governments: Roads, emergency management, public communication, nuisance concerns, and sometimes limited authority over site operations.
The Palmyra reporting illustrates why these responsibilities should not be collapsed into the phrase “the government.” An agriculture agency may authorize an emergency disease-response action while an environmental agency evaluates whether the site is meeting performance standards. Those decisions can appear contradictory unless the agencies’ different roles are explained.
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How disposal methods compare
| Method | When it may fit | Advantages | Main constraints and risks |
|---|---|---|---|
| In-house composting | A farm has suitable buildings or space, carbon, water, equipment, and trained workers | Limits transport and can generate heat on site | Odor, ammonia, flies, poor aeration, leachate, worker exposure, and barn-air concerns |
| Outdoor composting | An approved site has suitable soil, drainage, setbacks, and enough space | Flexible and scalable | Runoff, flooding, groundwater risks, neighbors, stormwater, and substantial carbon demand |
| Permitted landfill | A willing engineered facility is available within a practical distance | Containment, leachate systems, and large capacity | Acceptance, permits, transport, leachate management, and available capacity |
| On-site burial | Soil, water-table, bedrock, and flood conditions are suitable and regulators approve | Rapid and avoids some off-site transport | Leachate, groundwater contamination, flooding, future monitoring, and public concern |
| Rendering | An approved facility accepts the material and has outbreak capacity | Resource recovery and an established mortality-management channel | Facility acceptance, interstate rules, transport, biosecurity, and capacity |
| Fixed incineration | A permitted plant has sufficient capacity | Controlled emissions and destruction of carcasses | Fuel, cost, distance, air permits, capacity, and ash disposal |
| Mobile or air-curtain incineration | An emergency requires treatment near the affected site | Can reduce long-distance transport | Equipment, fuel, emissions, location, and permitting |
| Open burning | Only where specifically authorized and no safer practical option exists | Technically simple and rapid | Uncontrolled smoke and emissions, ash, air-quality risks, and public opposition |
EPA’s preference for composting and permitted landfills is not a universal ranking for every farm. APHIS planning guidance treats disposal as a site- and capacity-dependent decision involving flock size, available space, carbon, transport, local conditions, environmental rules, cost, and biosecurity.
What should residents ask about a nearby disposal site?
Residents do not need to handle the material or trespass on a farm to ask reasonable questions. The most useful questions concern documentation and controls:
- Which federal, state, or local agency approved the site and the specific disposal method?
- Are the windrows, burial areas, or temporary-storage areas outside flood-prone zones?
- What are the site’s soil, bedrock, and seasonal-high-water-table conditions?
- How far is the site from drinking-water wells, residences, streams, drainage swales, and other poultry premises?
- Are groundwater and surface water being sampled, and who reviews the results?
- Are temperature, moisture, drainage, and corrective-action records available?
- Has the material met documented pathogen-reduction and maturity standards before any land application?
- What controls odors, flies, rodents, scavengers, runoff, and leachate?
- How are trucks sealed, routed, cleaned, disinfected, and inspected?
- When will the site be closed, removed, or restored?
- Who is responsible for monitoring and paying for remediation if the site fails?
Records that would help demonstrate responsible management include temperature logs, moisture and drainage records, groundwater or surface-water test results, pathogen-reduction documentation, inspection reports, odor and fly-control records, truck-cleaning records, final-compost approval, and land-application restrictions or monitoring plans.
How to interpret current outbreak numbers
Bird-loss totals change as APHIS adds detections and updates its records. A number in a headline may count birds, flocks, premises, or birds depopulated because they were exposed—not only birds that individually tested positive. It may also include commercial and backyard flocks, depending on the dashboard view.
For the latest U.S. animal figures, use the APHIS commercial and backyard flock detection dashboard immediately before publication or when evaluating a new report. APHIS says detections tend to rise in fall and spring as wild birds migrate, and the most recent 30-day view is the best snapshot of current impact. Any reported total should include its data cutoff date and definition.
Frequently Asked Questions
Does a bad smell near a chicken-composting site mean people have bird flu?
No. Odor can indicate decomposition, ammonia, anaerobic areas, exposed carcasses, or inadequate nuisance controls, but it does not prove H5N1 transmission. People should avoid contact with carcasses, litter, runoff, and contaminated equipment. Human infection claims require public-health or laboratory evidence.
Can properly managed composting inactivate avian influenza virus?
Properly designed and monitored mortality composting is intended to create conditions that reduce or inactivate the virus. It is not automatic: carbon balance, moisture, oxygen, pile geometry, temperature history, drainage, and regulatory approval all matter. A 131°F reading alone is not a universal guarantee that a pile is safe.
Is burial of HPAI carcasses allowed?
Burial may be allowed in some incidents, but it is highly site-dependent and subject to state environmental requirements. Flood-prone land, shallow bedrock, karst, a high water table, or nearby wells can make it inappropriate. Above-ground or shallow burial with carbon is not proven for every disease and requires state approval where used.
Should I stop buying chicken or eggs because of bird-flu culling?
No. Diseased poultry carcasses are condemned and are not supposed to enter the human food supply. CDC says properly handled and cooked poultry products have not been shown to cause U.S. human infections. Cook poultry and eggs to 165°F and avoid raw or undercooked products.
The Bottom Line
Mass depopulation can be necessary to control HPAI, but it creates a second emergency: managing millions of carcasses and contaminated materials without harming workers, neighbors, water, air quality, or other farms. Properly managed composting and permitted landfilling can be effective, while burial, rendering, and incineration may fit particular sites and capacities. The meaningful test is not whether a disposal method sounds natural or modern; it is whether the operation has suitable siting, containment, worker protection, documented pathogen reduction, environmental monitoring, regulatory compliance, and transparent communication.
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