What human composting is and how the body breaks down

Human composting, also called natural organic reduction, is a way to return a body to soil through controlled decomposition. Instead of burial or cremation, the body is placed in a vessel with wood chips, straw, and alfalfa, then left for about 30 days while naturally occurring microbes and fungi break down the tissues. The result is roughly a cubic yard of finished compost—dark, crumbly, and odorless—that can be used in gardens, returned to families, or scattered on land.

The process works because the same bacteria and fungi that decompose leaves and kitchen scraps also break down human tissue, but faster and more completely when conditions are controlled. The vessel is kept at a specific moisture level and temperature, similar to an active compost pile, which speeds decomposition and prevents the odors and pests that occur in traditional burial. After 30 days, what remains is carbon-rich material that looks and feels like garden soil.

Human composting is legal in Washington, Colorado, Vermont, California, New York, Oregon, and Vermont as of 2024, with other states considering legislation. It is not available everywhere, and availability depends on state law and whether a licensed facility operates near you.

Key Takeaways

  • Human composting uses controlled decomposition in a vessel with wood chips and plant material to turn a body into finished compost in about 30 days.
  • The process relies on naturally occurring microbes and fungi, the same organisms that break down yard waste, working in an environment optimized for speed and odor control.
  • The finished compost is safe to handle and can be used in gardens, kept by families, or scattered on land according to state law.
  • Human composting is legal in seven states as of 2024, and you must use a licensed facility in a state where the practice is permitted.
  • The entire process, from intake to finished compost, takes about 30 days and costs between $5,000 and $7,500 depending on the facility.

The step-by-step process at a licensed facility

When you arrive at a human composting facility, your body is placed in a cylindrical vessel about the size of a large cabinet. The vessel is filled with a mixture of wood chips, straw, alfalfa, and other plant material that provides carbon and creates the right environment for decomposition. The ratio is roughly 1 part body to 4 parts plant material by volume.

The vessel is then sealed and kept at a temperature between 55 and 77 degrees Fahrenheit, with moisture monitored to stay between 50 and 60 percent. These conditions mimic an active compost pile and allow the microbes already present in the plant material and on the body to multiply rapidly. Over the first week, the temperature inside the vessel rises as microbial activity increases, speeding the breakdown of soft tissues.

After about 30 days, the vessel is opened and the contents are removed. At this stage, the body has been reduced to its mineral components—calcium, phosphorus, and other elements—mixed with the plant material. The mixture is then screened to remove any remaining hard materials like metal from dental work or surgical implants, which are returned to the family or disposed of separately.

The finished compost is then cured for another 5 to 14 days in an open pile, where it continues to stabilize and cool. Once curing is complete, the compost is ready for use or return to the family. Most facilities deliver the compost in a container or bag, and families can then decide what to do with it.

How the body actually decomposes at the cellular level

Human decomposition in composting happens through two main processes: autolysis and microbial breakdown. Autolysis is the breakdown of cells by their own enzymes—this happens when ready after death as cells release their contents. In a composting vessel, this process is accelerated by the warm, moist environment.

Microbial breakdown begins within hours and is the main driver of decomposition. Bacteria like Clostridium and Bacillus, which are naturally present in soil and plant material, consume the proteins, fats, and carbohydrates in human tissue. Fungi also play a role, breaking down tougher materials like collagen in skin and connective tissue. As these microbes feed, they produce heat—which is why an active compost pile gets warm—and carbon dioxide and water vapor, which escape through the vessel's ventilation system.

The process is faster in a composting vessel than in soil burial because the conditions are optimized: the right moisture, temperature, and mix of carbon and nitrogen materials keep microbial populations at peak activity. In soil, decomposition can take years. In a composting vessel, the same work is done in weeks.

What happens to bones and teeth

Bones and teeth are made of minerals—mainly calcium phosphate—held together by collagen, a protein. In human composting, the collagen breaks down over the 30-day period, but the mineral structure of bone remains largely intact. This is why the finished compost is screened: to remove bone fragments, which are typically small and brittle by the end of the process.

Dental work—fillings, crowns, implants—does not break down and is removed during screening. These materials are typically returned to the family or, if the family declines, disposed of as medical waste. Some facilities offer to extract precious metals like gold from dental work and return them to the family, though this is not standard practice.

The mineral content of bone actually enriches the finished compost, adding calcium and phosphorus that are valuable for plant growth. This is one reason the finished product is suitable for gardens and landscaping.

Safety and pathogen concerns

A common question is whether human composting spreads disease. The answer depends on the temperature and duration of the process. The vessel is kept warm enough and long enough that most pathogens are killed. Bacteria like E. coli and Salmonella die at temperatures above 131 degrees Fahrenheit, and the composting process reaches these temperatures within the first week.

However, some hardy pathogens—like the prion that causes Creutzfeldt-Jakob disease—can survive standard composting conditions. For this reason, some states require that bodies of people who died from certain infectious diseases be excluded from human composting, or that the finished compost be treated before use. Check your state's regulations for specifics.

The finished compost is tested by some facilities before release, though standards vary by state. If you are concerned about safety, ask the facility whether they test the finished product and what their protocols are for handling bodies of people who died from infectious disease.

What you can do with the finished compost

Once the compost is finished and cured, you have several options. You can use it in a garden or landscape, scatter it on land you own or have permission to use, keep it in a container at home, or bury it in a cemetery plot. Some families mix the compost with soil and plant a tree or shrub in it, creating a living memorial.

State law determines what is allowed. In Washington, the first state to legalize human composting, the compost can be used anywhere soil is used, with no special restrictions. In other states, rules may be more specific—for example, some states require that compost be used only on private land, not in public parks or shared gardens. Check your state's regulations before deciding what to do with the finished compost.

If you do not want to keep the compost, some facilities offer to scatter it on their grounds or donate it to land trusts or conservation areas. A few families choose to have the compost buried in a cemetery plot, which gives them a defined place to visit and remember.

Cost and how it compares to other options

Human composting typically costs between $5,000 and $7,500, depending on the facility and what services are included. This is less than a traditional funeral with burial, which can run $7,000 to $12,000 or more, but more than direct cremation, which costs $1,000 to $3,000. The price usually includes the composting process itself, basic preparation of the body, and return of the finished compost to the family.

Additional costs may explore if you want the facility to scatter the compost, hold a memorial service, or provide a container for the finished product. Some facilities offer payment plans or work with funeral homes to handle arrangements, which may add to the total cost.

Because human composting is new and available in only a few states, prices may vary more than they do for cremation or burial. If you are considering this option, contact facilities in your state directly for current pricing and what is included.

Frequently Asked Questions

Does human composting smell bad?

The sealed vessel prevents odors from escaping, and the controlled conditions—warm, moist, and rich in carbon—produce the same earthy smell as a garden compost pile rather than the smell of decay. Once the vessel is opened after 30 days, the smell is mild and similar to finished compost. Facilities are designed to contain any odor, and neighbors should not notice anything.

Can I have a funeral or memorial service before composting?

Yes. Some families hold a viewing or service before the body is taken to the composting facility. However, embalming is not necessary for human composting, and the body does not need to be preserved for long. Talk to the facility about timing and what options they offer for families who want a service first.

Is the finished compost safe to use around food plants?

The finished compost is safe to use in vegetable gardens and around food plants, provided the composting process reached the required temperature and duration to kill pathogens. Ask the facility whether they test the finished compost or follow state safety standards. If you have concerns, you can use the compost in ornamental gardens instead.

What if I want to be composted but it is not legal in my state yet?

You can travel to a state where it is legal and arrange composting there. Some facilities work with families from out of state and can handle transportation of the body. Alternatively, you can plan ahead and advocate for legislation in your state, as several states are currently considering legalizing human composting.

How do I know if a facility is licensed and legitimate?

Check your state's health department or funeral board website for a list of licensed human composting facilities. Legitimate facilities are required to be licensed, carry liability insurance, and follow state regulations for handling human remains. Do not use an unlicensed facility, as it is illegal and unsafe.