Water Cremation UK: Alkaline Hydrolysis Rules and Availability

Water cremation — also known as alkaline hydrolysis, resomation or aquamation — uses water, heat and an alkaline solution instead of flame. Scotland's regulatory framework took effect on 2 March 2026, but Social Security Scotland says no provider currently offers the service. This guide separates the legal framework from actual consumer availability.

By the CremationCompare Team · Updated 20 July 2026

What is Water Cremation?

Water cremation is a method of laying a body to rest that uses water, heat, and an alkaline chemical solution to gently dissolve soft tissue. The process is sometimes called alkaline hydrolysis (its scientific name), resomation (a brand name used by the company that pioneered the technology), aquamation, or bio-cremation.

The end result is similar to traditional flame cremation: the family receives bone ash, which can be kept, scattered, or buried as they choose. But how you get there is very different — and advocates say far kinder to the planet.

Water cremation has been legal in parts of the United States and Canada since the early 2000s and is now available in over 25 US states. It has also been used commercially in some South African provinces. Scotland's landmark decision in March 2026 marks the first time a UK nation has crossed this threshold.

How Does Alkaline Hydrolysis Work?

The process is carried out inside a specialist stainless steel vessel called a hydrolysis chamber. Here is what happens, step by step:

1. The body is placed in the chamber in a biodegradable shroud or container. Metal implants (such as pacemakers, hip replacements, or titanium screws) can remain — they are recovered and recycled afterwards.
2. An alkaline solution is added. This is typically a mixture of approximately 95% water and 5% potassium hydroxide (also known as lye or caustic soda), a naturally occurring alkali.
3. Heat and pressure are applied. The chamber is heated to around 150–180°C under pressure, which accelerates the natural decomposition process. The process takes approximately 4 to 8 hours.
4. Soft tissue dissolves.Proteins, fats, and other soft tissue break down into a sterile, brown liquid. This liquid — sometimes called the "effluent" — is safe to release into the standard wastewater system, just like water from a hospital or mortuary.
5. Bones are rinsed and processed.The remaining bone structure is rinsed with clean water, then dried and ground into a fine white or ivory-coloured powder — the "ashes" — which are returned to the family.

The entire process takes place at a licensed facility. Families are not present during the process, much like a standard direct cremation. A memorial service can still be arranged separately, at a time and place of the family's choosing.

Benefits of Water Cremation Compared to Flame Cremation

Proponents of water cremation highlight several significant advantages over traditional flame cremation:

Environmental impact

This is the headline benefit. Flame cremation produces roughly 150–400kg of CO₂ per cremation and uses significant amounts of natural gas. Water cremation, by contrast, is estimated to produce approximately 90% less carbon emissions than flame cremation. It uses substantially less energy and produces no airborne pollutants such as mercury (which can be released when amalgam dental fillings are incinerated).

Greater volume of ashes returned

Water cremation typically returns 20–30% more ash than flame cremation. This is because water-based decomposition leaves more of the bone mineral matrix intact, whereas flame cremation incineration destroys more of the bone.

No atmospheric emissions

There is no chimney, no smoke, and no particulate matter released into the air. This makes water cremation more compatible with urban locations and reduces concerns about air quality near crematoria.

Perceived as more gentle

Some families find comfort in the idea that the body is dissolved by water and warmth — processes that mirror natural decomposition — rather than by fire. This is a personal and emotional consideration, not a scientific one, but it matters to many people.

Medical implants and protheses

Metal implants survive the process intact and can be recovered and ethically recycled, which is more difficult with flame cremation.

Water Cremation vs. Flame Cremation vs. Natural Burial

Here is how the three main eco-conscious end-of-life options compare across the key factors most families consider:

Current Legal Status Across the UK

The position varies by nation. Here is what we could verify from official sources on 20 July 2026:

Scotland — regulations in force from 2 March 2026

The Hydrolysis (Scotland) Regulations 2026 came into force on 2 March. Scottish Government guidance says a proposed provider must notify the Inspector of Burial, Cremation and Funeral Directors at least three months before starting and may also need planning, trade-effluent and environmental permissions. Social Security Scotland says no provider currently offers alkaline hydrolysis.

Sources: Scottish Government guidance and Social Security Scotland, checked 20 July 2026.

England — Not yet legal

Water cremation is not currently legal in England. Cremation in England and Wales is governed by the Cremation Act 1902 and subsequent regulations, which specify flame cremation only. Any change would require primary legislation or a significant amendment to the Cremation Regulations 2008. The Ministry of Justice, which oversees cremation law in England and Wales, has not yet announced a timetable for legislative reform.

Wales — Not yet legal

Cremation law in Wales is governed by the same legislation as England (the Cremation Act 1902 and 2008 regulations). Wales has not introduced separate legislation on alkaline hydrolysis. There are no current announcements from the Welsh Government on this matter.

Northern Ireland — Not yet legal

Northern Ireland operates under its own cremation regulations. Alkaline hydrolysis is not currently permitted, and no legislative changes have been announced.

When Might England Legalise Water Cremation?

There is no confirmed official timetable for an operational service in England. We therefore do not predict a consultation, legislation or launch year.

We will update this guide only when a named government source publishes a concrete change.

What Will Water Cremation Cost in the UK?

No provider currently offers alkaline hydrolysis in Scotland according to Social Security Scotland, and we found no operational route elsewhere in the UK. There is therefore no reliable UK consumer price to publish.

• Starting prices for direct cremation among providers compared here range from £895 to £1,695. No reliable UK water-cremation price is available yet, so we do not estimate one.

Frequently Asked Questions

What is the difference between water cremation and alkaline hydrolysis?

They are the same process, just different names. "Water cremation" is the plain-English term used by funeral providers and the media. "Alkaline hydrolysis" is the scientific term used by regulators and researchers. You may also hear it called resomation, aquamation, or bio-cremation — all describe the same method.

Is water cremation legal in the UK?

Scotland's Hydrolysis Regulations came into force on 2 March 2026, but Social Security Scotland says no provider currently offers the service. We found no equivalent operational route in England, Wales or Northern Ireland as of 20 July 2026.

What happens to the liquid produced during water cremation?

The sterile liquid produced — known as "effluent" — is safe and can be released into the standard municipal wastewater system. It has a similar composition to the water released by hospital mortuary processes. It is not hazardous and undergoes further treatment at wastewater facilities, just like any other household or industrial water discharge.

Can you still have a funeral service with water cremation?

Yes. Just like a direct cremation, water cremation involves no ceremony at the facility itself. Families are free to arrange a separate memorial service, celebration of life, or scattering ceremony at any time and any location they choose.

Is water cremation more eco-friendly than direct cremation?

Yes, significantly. Water cremation produces approximately 90% less carbon than flame cremation, uses less energy, and produces no atmospheric emissions. Both are far more environmentally friendly than a traditional funeral with embalming and burial in a lined coffin.

Can I pre-arrange water cremation in England?

You cannot currently buy an available alkaline-hydrolysis service in England. You can record a preference for your family, but it does not guarantee that the law or a provider will make the service available when needed.

How much ash is returned with water cremation?

Families typically receive around 20–30% more ash from water cremation compared to flame cremation. This is because the water-based process preserves more of the bone mineral matrix. The ash is white or ivory in colour and can be kept, scattered, or buried in the same ways as ash from flame cremation.

What happens to metal implants during water cremation?

Metal implants — including hip replacements, pacemakers, titanium screws, and dental metal — are not dissolved by the alkaline hydrolysis process. They are recovered after the process and can be recycled ethically, typically through specialist programmes. No removal prior to the procedure is necessary.

Related Guides

• What is direct cremation? A complete UK guide
• Direct cremation cost UK (2026 price guide)
• How to compare direct cremation providers
• Planning ahead: pre-arranging a direct cremation
• Compare all UK providers

This guide is for information only. CremationCompare is an independent comparison service and is not affiliated with a hydrolysis provider. Legal and availability information was checked against named official sources on 20 July 2026 and may change.