Water Cremation (Aquamation): How Alkaline Hydrolysis Works
Water Cremation (Aquamation): How Alkaline Hydrolysis Works
Water cremation—also called aquamation or alkaline hydrolysis—uses water, alkali, gentle heat, and time to return a body to its natural elements. It uses far less energy than flame cremation and releases no direct emissions. This guide explains how the process works, how it compares to fire, what families receive afterward, where it is legal, and how faith traditions view it.
What is water cremation and how does it work?
Water cremation, or aquamation, is a process called alkaline hydrolysis that uses water, potassium hydroxide, gentle heat, and pressure to break a body down to its basic components over several hours. It replicates natural decomposition, leaves only softened bone that is dried and returned to the family, and uses far less energy than flame cremation.
What Water Cremation Actually Is
Water cremation is the common name for a process scientists call alkaline hydrolysis. Despite the word cremation, no flame is involved. Instead, the body is gently reduced to its basic chemical building blocks using water, an alkali such as potassium hydroxide, warmth, and time. The result mirrors what happens naturally when a body returns to the earth, only accelerated from years into hours.
You may also hear it called aquamation, resomation, bio-cremation, or flameless cremation. These are marketing and trade names for the same underlying science. The process was first developed to handle animal remains and has since been adapted for human end-of-life care, pet aftercare, and even offered as an option by a growing number of funeral homes.
At the end of the process, the family receives a similar keepsake to flame cremation: dried, mineralized bone remains, often described as ash. What differs is the method of getting there, the energy used, and the environmental footprint left behind.
How the Process Works, Step by Step
The body is placed in a stainless steel vessel that resembles a large cylinder. The chamber is filled with a solution that is roughly 95 percent water and 5 percent alkali. The vessel is sealed and gently heated. Depending on the system, temperatures range from about 200 to 300 degrees Fahrenheit, and some machines use pressure to speed things along while others run at lower heat over a longer window.
Over the next several hours, the warm alkaline solution breaks the body down into its natural chemical components: water, salts, sugars, amino acids, and peptides. This is the same chemistry that drives ordinary decomposition in soil, simply concentrated and controlled. Soft tissue dissolves entirely, leaving only the mineral structure of the bones.
When the cycle finishes, the remaining bone is soft and porous. It is rinsed, dried, and then processed into a fine white powder that is returned to the family in an urn. The liquid that remains is a sterile, nutrient-bearing solution that is safely returned to the water system, and in some regions it is used to nourish soil.
How It Differs From Flame Cremation
The clearest difference is the absence of fire. Flame cremation uses a furnace that burns natural gas or propane to reach temperatures near 1,800 degrees Fahrenheit, reducing the body over one to three hours. Water cremation uses warm water and alkali instead, so nothing is burned.
Because nothing burns, water cremation produces no direct smoke, no airborne mercury from dental fillings, and no direct carbon dioxide from combustion. The energy demand is also much lower, since heating water to a few hundred degrees takes a fraction of the fuel needed to sustain a furnace at nearly two thousand.
Families often notice a gentler quality to the returned remains. Aquamation typically yields a slightly greater volume of bone powder than flame cremation, and the color is usually whiter because the bone is not scorched. The mineral content is otherwise similar, and the remains can be kept, buried, scattered, or divided among relatives just as flame ashes can.
Environmental Benefits
For many families, the environmental profile is the main draw. Water cremation is generally estimated to use a small fraction of the energy of flame cremation and to produce a correspondingly smaller carbon footprint. Because there is no combustion, there are no direct greenhouse gas emissions and no release of vaporized mercury or other pollutants into the air.
The process also avoids the land use of traditional burial and the embalming chemicals often associated with it. The byproduct liquid is sterile and rich in the same nutrients found in decomposition, so it does not contaminate the water system the way some people fear. In places where regulations permit, that nutrient-rich water can even support plant life.
It is worth being measured about these claims. The exact energy and emissions savings depend on the specific machine, the local energy grid, and how the facility handles the byproduct. Still, across independent comparisons, water cremation consistently ranks among the lowest-impact end-of-life options available today.
What You Get Back
After the cycle and drying are complete, the family receives the mineralized bone remains, processed into a soft, powdery form and placed in an urn or container of their choosing. These remains behave like flame cremation ashes: they can be kept at home, buried in a plot or columbarium, scattered in a meaningful place, or shared among family members in smaller keepsake urns.
Any medical devices, implants, or prosthetics are recovered intact rather than melted, so items like pacemakers, joint replacements, and metal fixtures are removed cleanly and can be recycled where local rules allow. Some families appreciate that a treasured piece of jewelry or a repaired implant survives the process undamaged.
Because aquamation is gentle, some providers can also return a small keepsake of the remains alongside the main urn, making it easier to divide a memorial among children or to reserve a portion for scattering at a later date.
Cost, Availability, and Legality
Pricing for water cremation varies widely by provider and region, and it often sits in a similar range to flame cremation, sometimes a little higher where the service is newer and less common. Because the equipment is specialized and not yet universal, availability is the bigger practical hurdle for most families rather than price. Always ask a local provider for a current, itemized quote.
Legality differs by location and continues to expand. In the United States, water cremation is authorized for human remains in a majority of states, and more continue to pass enabling legislation each year. It is also available in parts of Canada, and several other countries either permit it or are actively reviewing approval. Because the legal picture changes often, confirm the current status with a licensed funeral director in your area.
If water cremation is not yet offered where you live, a funeral home may be able to arrange transport to a licensed provider in a neighboring region. This adds cost and time, so it is worth discussing early when comparing your options.
Religious and Cultural Views
Faith perspectives on water cremation are still forming, much as they once did for flame cremation. Some Protestant denominations and individual clergy have embraced it, and a number of prominent religious figures have chosen aquamation for its gentleness and stewardship of creation. Others remain cautious or prefer traditional burial.
Positions can differ within a single tradition, so the most reliable path is to speak directly with your own clergy member or spiritual advisor about what is permitted and how a service might be arranged. Many families find that the ceremony, memorial gathering, and remembrance rituals can proceed exactly as they would with any other form of final disposition.
Culturally, the appeal of a water-based, low-impact process resonates with people who value environmental stewardship or who find comfort in the image of a body returning gently to its natural elements. As with any deeply personal decision, there is no single right answer, only the one that fits the person and family.
Honoring the Person Afterward
Whatever method of final disposition a family chooses, the deeper work of remembrance continues long after the service ends. Water cremation returns a keepsake of the person, but it is the stories, photographs, and voices that keep their presence alive for the people who loved them.
Many families create an online memorial where they can gather photos from every chapter of a life, short videos, recorded voicemails, and written tributes from relatives and friends. Unlike a single urn on a shelf, a digital memorial can be opened by anyone in the family, anywhere, and it grows richer as more people add their memories.
Some families also place a small QR code on an urn, plaque, or memorial stone that links to that online tribute. A visitor can scan it and instantly see the person as they truly were, turning a quiet moment of remembrance into a full encounter with a life well lived.
Keep Their Story Alive With a Free Digital Memorial
Whatever final arrangements a family chooses, memory is what endures. A digital memorial gathers photos, videos, voices, and tributes in one place—so a life is remembered in full, not reduced to a single keepsake, and shared with generations to come.
It is free to create and takes about five minutes. A QR plaque is optional and comes later — the page is the heart of it.
Create a free memorial page
Create a Free Memorial Page
Building an online memorial is free. Add photos, videos, stories, and voice recordings, and invite family to contribute their own. If you wish, you can later add a QR code plaque or memorial stone that links to the page, but the digital memorial itself costs nothing and lasts.
Water Cremation (Aquamation) — FAQ
No. Regular cremation uses intense flame in a furnace to reduce the body. Water cremation, or aquamation, uses warm water, an alkali, and time to break the body down through alkaline hydrolysis. Both return mineralized bone remains to the family, but water cremation involves no fire, no smoke, and far less energy.
The body is placed in a sealed steel vessel filled with a solution of water and alkali, then gently heated for several hours. The warm solution breaks soft tissue down into water, salts, and amino acids, leaving only softened bone. The bone is dried and processed into a fine powder returned to the family, much like ashes.
Generally, yes. Because nothing is burned, water cremation produces no direct combustion emissions and no vaporized mercury, and it uses a fraction of the energy of flame cremation. The exact savings depend on the equipment and local energy grid, but it consistently ranks among the lowest-impact end-of-life options available.
It depends on your location. Water cremation is legal for human remains in most U.S. states and parts of Canada, with more regions approving it each year. Because the law changes frequently, confirm the current status with a licensed funeral director in your area, who can also arrange transport if needed.
Families receive the mineralized bone remains, dried and processed into a soft white powder placed in an urn. These behave like flame cremation ashes and can be kept, buried, scattered, or shared. Implants and medical devices are recovered intact and can be recycled where local rules allow.
Views are still forming, as they once did for flame cremation. Some denominations and clergy have embraced aquamation for its gentleness, while others prefer traditional burial. Positions can vary within a single faith, so the best step is to speak directly with your own clergy member about what is permitted.
Start a Memorial Today
However you say goodbye, don’t let the memories fade. Create a digital memorial and invite family to add their own remembrances.