Water Cremation (Alkaline Hydrolysis): What UK Families Need to Know

Water cremation uses hot water and a small amount of alkaline solution to do what nature does over many years: break the body down into its basic elements.

The body is placed in a sealed, pressurised chamber. A mixture of roughly 95% water and 5% alkaline solution (potassium hydroxide) is heated to around 160 degrees Celsius. Over a period of four to six hours, the soft tissue dissolves completely.

What remains is bone material, which is dried and processed into a fine white powder. This powder is returned to the family in an urn, much like the ashes from a traditional cremation.

The liquid produced by the process is sterile and safe. It contains no DNA, no pathogens, and no harmful chemicals. It is released as treated wastewater, subject to the same discharge regulations as any other water treatment process.

Some people find the idea of water cremation unusual at first. That is understandable. But the end result for families is very similar to flame cremation: you receive a container of remains that you can scatter, bury, or keep at home.

Traditional cremation uses intense heat (between 800 and 1,000 degrees Celsius) to reduce the body to ash. It takes about 90 minutes and uses a significant amount of energy, roughly the equivalent of 12 to 24 gallons of fuel per cremation.

Water cremation works at a much lower temperature (around 160 degrees Celsius) and takes longer (four to six hours), but uses far less energy overall.

The key differences:

• What you receive back: Both methods return processed remains to the family. Water cremation tends to return a slightly larger quantity of powder, and it is typically whiter than traditional cremation ashes.
• Environmental impact: Water cremation produces around 90% fewer carbon emissions than flame cremation. There are no airborne pollutants, no mercury emissions from dental fillings, and no burning of fossil fuels during the process itself.
• Medical implants: Traditional cremation destroys most implants. Water cremation leaves metal implants (hip replacements, pacemakers, dental work) intact and they can be safely recycled. Pacemakers do not need to be removed beforehand, which is required for traditional cremation.
• The process itself: The body is wrapped in a biodegradable material before being placed in the chamber. There is no flame, no smoke, and no combustion of any kind.

Water cremation is new to the UK, so there is no established price yet from Scottish providers. However, based on data from the US (where it is legal in 28 states), Canada, and other countries where it is already offered, here is what we can reasonably expect.

Likely cost of water cremation in Scotland (estimated)

• Facility fee: £800 to £1,200
• Funeral director's fees: £800 to £1,500
• Coffin or container (biodegradable): £100 to £400
• Estimated total: £1,700 to £3,100

How it compares to other options

The honest answer is: nobody knows exactly what Scottish providers will charge until they open. Early indications from international markets suggest water cremation sits somewhere between the cost of a direct cremation and a traditional cremation with service. It is unlikely to be the cheapest option, but it should be significantly less expensive than burial.

If cost is your primary concern, direct cremation (£740 to £1,600) remains the most affordable choice; if you go this route, use a reputable local funeral director rather than an online-only provider (see our funeral costs guide for why). Water cremation is more likely to appeal to families who want a middle ground between affordability and environmental considerations.

For families who care about the environmental impact of their choices, the numbers are worth knowing.

Traditional cremation produces an average of around 150 pounds (68 kilograms) of carbon dioxide per cremation. Across the UK, where roughly 77% of funerals are cremations, that adds up. Cremation also releases mercury vapour from dental amalgam fillings, which is a regulated pollutant.

Burial has its own footprint. Millions of board feet of hardwood go into caskets each year. Embalming fluid contains formaldehyde, a known carcinogen, and much of it eventually seeps into the ground. Cemetery land is taken out of use permanently.

Water cremation is not zero-impact, but it is substantially lower. Studies suggest it produces around one tenth of the carbon emissions of flame cremation. The liquid byproduct is sterile and nutrient-rich; in some countries it is used as fertiliser. No mercury is released. No fossil fuels are burned during the process itself.

This matters more to some families than others, and that is fine. The point is not to judge anyone's choice. It is to make sure people know the option exists.

The law is in place, but families cannot choose water cremation in Scotland today. There are no operational facilities yet.

Providers will need to secure planning permission for a hydrolysis facility, obtain "Consent to Discharge" from the Scottish Environment Protection Agency (SEPA) for the wastewater, and meet the regulatory standards set out in the new regulations (including maintaining public management plans and keeping records for 50 years).

The Scottish Government estimates this will take six to nine months. Realistically, the first Scottish facility could be operational by late 2026 or early 2027.

If you are arranging a funeral now and are interested in water cremation, it is not yet an option you can choose. But it is worth mentioning to your funeral director so they are aware of your family's interest for the future.

Internationally, water cremation is already legal and available in 28 US states, several Canadian provinces, Ireland, South Africa, Australia, and New Zealand. The technology has been used in these countries for over a decade.

The Hydrolysis (Scotland) Regulations set out clear standards.

For operators

• Must maintain a publicly accessible management plan explaining how the facility operates
• Must retain records for 50 years
• Subject to the same oversight provisions as crematoriums under the Burial and Cremation (Scotland) Act 2016

For families

• The process for choosing water cremation will be similar to choosing cremation: you instruct your funeral director, who arranges everything with the facility
• You receive the processed remains back in an urn, just as with traditional cremation
• You have the same rights regarding what you do with the remains (scatter, bury, keep at home)

The regulations were developed after extensive public consultation. 84% of respondents to the Scottish Government's consultation supported the introduction of water cremation.

This is personal and varies widely, so it is worth having the conversation within your family or faith community.

Some faiths have not yet issued formal guidance on water cremation because it is so new. Others have.

• Church of Scotland: Has not objected to the legislation
• Islam and Judaism: Both traditions generally require burial and would likely view water cremation the same way they view flame cremation
• Hinduism and Sikhism: Both traditions often favour cremation and may be open to water cremation as an alternative
• Humanist and non-religious families: Generally supportive of having more options

If faith or cultural tradition matters to you, speak to your religious leader before making any decisions. This is new territory for everyone.

There is no right or wrong answer. Water cremation is simply another option, and having options is a good thing when you are making difficult decisions during a difficult time.

You might consider water cremation if

• Environmental impact matters to your family
• You like the idea of a gentler process
• You want remains returned to you (as with cremation) but prefer an alternative to flame
• The person who died expressed an interest in environmentally conscious funeral options

You might prefer traditional cremation or burial if

• You want an established, familiar process
• Your faith or cultural tradition has clear guidance
• You need the funeral to happen soon (water cremation facilities may have limited availability initially)
• Cost is the primary concern and direct cremation is more affordable

Whatever you choose, there is no judgment. The best funeral is one that feels right for the person who died and for the people left behind. For help managing the practical side of a death alongside funeral decisions, see our guides to closing utility accounts and redirecting post.

• Talk to your funeral director about water cremation if it interests you
• If you are in Scotland, ask about expected local availability and timeline
• Read our guide on funeral costs for a full comparison of burial, cremation, and direct cremation costs
• Read our guide on arranging a funeral for the complete step-by-step process
• Keep an eye on the Law Commission's work if you are in England and Wales: lawcommission.gov.uk