Alkaline Hydrolysis Cremation: What It Is, How It Works, and Whether to Consider It

When most people think about cremation, they imagine fire. But there is a second option — alkaline hydrolysis, also called water cremation or aquamation — that achieves the same end result through a very different process. It is quieter, uses no flame, and produces no emissions. For some families, and for some parents, it is exactly the right choice.

This guide explains what alkaline hydrolysis is, how it compares to conventional cremation, where it is legal, and what questions to ask if your family is considering it.

What Is Alkaline Hydrolysis?

Alkaline hydrolysis is a water-based process that accelerates the natural decomposition of the body. The body is placed in a chamber with a solution of water and potassium hydroxide (an alkaline compound), heated to around 300°F, and held under pressure for two to three hours. The process breaks down soft tissue at the molecular level, leaving only the bones.

Those bones are then rinsed, dried, and processed into a fine powder — just like the "ashes" returned after flame cremation. The volume of remains is typically 20-30% greater than with fire-based cremation, and many families say the color is a creamier white rather than gray.

The water effluent — the liquid byproduct — is a sterile, pH-neutral solution that is safely discharged into the municipal water system, similar to other wastewater. It contains no DNA, no infectious material, and no harmful chemicals.

How Does It Compare to Conventional Flame Cremation?

Why Do Families Choose Alkaline Hydrolysis?

Environmental values. For parents who cared about their environmental footprint throughout their lives, alkaline hydrolysis offers a meaningful reduction in the impact of disposition. No air emissions, no carbon from combustion, no mercury from dental work released into the atmosphere.

Religious or emotional discomfort with fire. Some religious traditions have reservations about fire-based cremation that do not apply to water-based disposition. Families should consult their own religious advisors, but alkaline hydrolysis has been accepted by some Catholic dioceses and other religious communities that historically opposed cremation.

Gentleness. This is subjective, but many families report that the water-based process feels gentler — less violent — than fire. For some people, that matters emotionally.

More remains. The greater volume of remains means families can divide them among multiple family members or use them in multiple ways (memorial jewelry, scattering, burial) without running short.

Where Is Alkaline Hydrolysis Legal?

As of early 2026, alkaline hydrolysis is legal in approximately 28 US states, including California, Colorado, Florida, Illinois, Minnesota, Oregon, and many others. It is not yet legal in all states, primarily due to legislative inaction rather than any safety or environmental concern.

In Canada, it is legal in Ontario and Saskatchewan. In the UK, Scotland became the first part of the British Isles to legalize it in 2024. Australia has legalized it in some states.

Before assuming it is available for your parent, verify the current legal status in your parent's state or country. Funeral homes offering the service will know immediately whether it is permitted where they operate.

What to Ask a Funeral Home Offering Alkaline Hydrolysis

Not all funeral homes offer alkaline hydrolysis, and those that do may have different practices. Key questions:

1. Do you perform the process on-site, or do you transport the body to a third-party facility? On-site is preferable for maintaining chain of custody.
2. How long after death will the process occur? Standard timelines are similar to conventional cremation.
3. What do you do with the water effluent? It should be discharged to the municipal sewer system after pH neutralization — this is the standard, environmentally sound approach.
4. What container is used for the remains? Alkaline hydrolysis produces a slightly larger volume of remains than fire cremation — confirm the provided urn is appropriately sized.
5. What is the all-in price, including the container and death certificate assistance? Get the itemized price list, as required by the FTC's Funeral Rule.
6. Are there any restrictions on what your parent can be wearing or carrying? Medical implants, pacemakers, and some materials need to be removed beforehand.

Documenting Your Parent's Preference

The most important thing to understand about alkaline hydrolysis — or any disposition preference — is that it is only honored if it is documented. A parent who mentions in conversation that they would prefer water cremation has expressed a wish, not a legally documented directive. If that parent dies without leaving written instructions, their adult children may disagree about what to do, and the default is often conventional burial or cremation depending on who makes the call first.

This is exactly why end-of-life planning matters. Documenting your parent's preference — specifically naming the type of disposition they want and, ideally, any specific funeral home or provider they have researched — removes ambiguity and protects their wishes from being overridden by grief, family conflict, or logistical defaults.

The End-of-Life Planning Workbook includes a funeral and memorial preferences worksheet that covers disposition type, specific wishes for the service, preferences around remains, and space to document any providers your parent has researched. It takes a single conversation and a few minutes to fill out — and it ensures that whatever your parent chooses, that choice is honored.

Get the End-of-Life Planning Workbook

Is Alkaline Hydrolysis Right for Your Family?

There is no universally right answer — only the right answer for your parent, based on their values, their religious background, what is legally available where they live, and what your family can access and afford.

What matters most is that this decision gets made in advance, in conversation with your parent, while they can express their own preferences clearly. The alternative — making this decision in the hours after death — is exactly the situation that end-of-life planning exists to prevent.

If your parent is open to the conversation, start with the basics: burial or cremation? Then, once that is established, introduce the idea that there are different types of cremation, including water-based options, and ask whether that aligns with their values. Many parents, when they learn that alkaline hydrolysis is gentler and more environmentally friendly than conventional cremation, find it worth exploring.

The conversation is not about death. It is about making sure their life is honored in a way that reflects who they actually were.