Scotland has become the first country in the United Kingdom to legalise water cremation, introducing an alternative method for handling human remains. The process, known as alkaline hydrolysis, provides families with a third option besides traditional burial and flame-based cremation.
The development marks a significant shift in funeral practices and has been described by industry experts as the largest change to cremation laws since cremation was first introduced in the UK in 1902.
The decision followed a public consultation conducted by the Scottish Government in 2023, which revealed strong public support for the practice. According to the consultation results, 84% of respondents supported the introduction of alkaline hydrolysis.
What is Water Cremation (Alkaline Hydrolysis)?
Alkaline hydrolysis, often referred to as water cremation or green cremation, is a method that uses water, heat, pressure and alkaline chemicals to accelerate the natural decomposition process.
Unlike traditional cremation, which burns the body at very high temperatures, this method breaks down the body chemically in a controlled environment.
Process of Water Cremation
The procedure involves several carefully controlled steps.
Step-by-Step Process
- Preparation of the Body
The body is wrapped in a biodegradable shroud, often made from materials such as silk or wool. - Placement in Pressurised Chamber
The body is placed inside a sealed chamber containing water and potassium hydroxide. - Heating Phase
The mixture is heated to about 150°C (300°F) and maintained for around 90 minutes. - Dissolution of Soft Tissue
The alkaline solution breaks down body tissues, leaving only the bone structure. - Bone Processing
The bones are then:- rinsed at 120°C
- dried
- pulverised into a coarse powder using a machine called a cremulator.
- Return of Remains
The final powdered remains are placed in an urn and returned to the family, similar to traditional cremation ashes.
Environmental Benefits
One of the major reasons behind the growing adoption of water cremation is its environmental sustainability.
Traditional cremation requires burning the body at extremely high temperatures and releases greenhouse gases.
Carbon Emissions Comparison
| Method | Carbon Footprint |
| Traditional cremation | ~320 kg CO₂ emissions |
| Water cremation | About 7 times less CO₂ |
Because of the significantly lower carbon emissions, alkaline hydrolysis is often described as a “green cremation”.
Global Adoption of Water Cremation
Although new to the UK, alkaline hydrolysis is already practiced in several countries.
Countries Where Water Cremation is Available
- United States – legal in 28 states
- Canada
- Ireland
- South Africa
- Australia
- New Zealand
It is already being used as a cremation option in places such as the Republic of Ireland and several US states.
Notable Use of Water Cremation
One of the most prominent individuals to choose this method was Desmond Tutu, the Nobel Peace Prize–winning anti-apartheid activist and former Archbishop of Cape Town.
His choice helped raise global awareness about environmentally sustainable funeral practices.
Significance
The legalisation of water cremation in Scotland represents an important development in modern funeral services and environmental policy.
Key Implications
- Introduces a third legal method for handling human remains alongside burial and flame cremation.
- Encourages eco-friendly funeral alternatives.
- Reflects growing public awareness of climate-friendly practices in end-of-life services.
- May influence future reforms in cremation laws across the UK and other countries.