What Is Aquamation (Alkaline Hydrolysis)?
By CRYSTAL BAI •
The short answer: Aquamation (also called alkaline hydrolysis, water cremation, or bio-cremation) is a water-based process that dissolves the body using a combination of water, heat, and an alkali solution — leaving behind bone fragments and a sterile liquid. It uses 90% less energy than flame cremation, produces no mercury emissions, and is legal in approximately 25 US states.
What Is Aquamation?
Aquamation — technically called alkaline hydrolysis — is a process that mimics and accelerates what happens naturally when a body decomposes in soil. Instead of fire (as in flame cremation) or soil microbes (as in burial or composting), aquamation uses a combination of warm water, high pressure, and an alkali solution (potassium hydroxide or sodium hydroxide) to break down soft tissue, leaving only the bones.
The process takes approximately 4–8 hours (compared to 2–3 hours for flame cremation). The resulting bones are processed into a white powder similar to cremated remains (ash), returned to the family in an urn. The liquid byproduct — a sterile, nutrient-rich effluent that resembles coffee-colored water — is discharged into the municipal water system, where it is treated like any other wastewater.
Aquamation vs. Flame Cremation: Key Differences
| Aquamation | Flame Cremation | |
|---|---|---|
| Energy use | ~90% less energy | Standard |
| Carbon emissions | Minimal (uses electricity, no combustion) | Significant (natural gas/propane) |
| Mercury emissions | None (no vaporization of dental amalgam) | Mercury released from dental fillings |
| Remains returned | White/cream powder, more volume than flame cremation | Gray ash, standard volume |
| Time | 4–8 hours | 2–3 hours |
| Cost | Comparable to or slightly above flame cremation | Standard |
Is Aquamation Legal?
As of 2024, aquamation is legal in approximately 25–28 US states, including California, Florida, Colorado, Oregon, Washington, Minnesota, New Mexico, and others. It is not yet legal in all states — primarily due to regulatory hurdles and, in some states, religious opposition to the liquid effluent discharge process. Legality varies and is expanding over time.
Internationally, aquamation is legal in the UK, parts of Canada (including Ontario and British Columbia), Australia, South Africa, and Netherlands.
The "Remains" Returned After Aquamation
Like flame cremation, aquamation returns bone fragments that are processed into a fine powder. The powder from aquamation is typically white or cream-colored (rather than gray) and greater in volume than flame cremation remains, because the process does not incinerate the bones — only the soft tissue is dissolved. The remains can be kept, scattered, buried, or incorporated into memorial products just as with flame cremation remains.
Religious and Cultural Perspectives on Aquamation
Aquamation has received acceptance from many religious traditions:
- Catholic: The Vatican issued guidance in 2023 explicitly permitting aquamation, alongside cremation and natural burial — with the same requirements for respectful treatment and disposition of remains.
- Jewish: Most Reform and Conservative rabbinical authorities have accepted aquamation. Orthodox Judaism generally requires traditional burial.
- Muslim: Most Islamic scholars require traditional burial and do not endorse aquamation.
- Protestant Christian: Most major Protestant denominations do not have official positions against aquamation; individual congregations and families may have varying views.
Environmental Case for Aquamation
Aquamation has the smallest carbon footprint of any current commercial body disposition method except natural burial:
- No combustion, so no direct greenhouse gas emissions
- Uses electricity (which can be sourced from renewables) rather than natural gas
- No mercury vaporization (flame cremation releases an estimated 1,000+ pounds of mercury annually in the US from dental fillings)
- The nutrient-rich effluent, if applied to land rather than sewers, could function as a soil amendment
For environmentally conscious families, aquamation represents a meaningful step beyond flame cremation — short of natural burial or human composting.
Cost of Aquamation
Aquamation typically costs $1,500–$3,000 — somewhat more than direct cremation but comparable to traditional cremation packages. Prices vary significantly by provider and region. As availability increases and economies of scale improve, prices are expected to decline.
How to Arrange Aquamation
Contact funeral homes or cremation providers in your area that offer aquamation. Ask specifically: "Do you offer aquamation or alkaline hydrolysis?" Not all funeral homes do, but availability is expanding. You can also pre-arrange by documenting your preference in an advance directive and sharing it with your healthcare proxy and family.
Frequently Asked Questions
Is aquamation the same as cremation?
Aquamation (alkaline hydrolysis) is an alternative to flame cremation — it dissolves soft tissue using water, heat, and an alkali solution rather than fire. The result is similar: bone fragments processed into a powder that is returned to the family in an urn.
What states allow aquamation?
As of 2024, approximately 25–28 US states allow aquamation, including California, Florida, Colorado, Oregon, Washington, Minnesota, and others. Legality continues to expand as more states pass enabling legislation.
Does the Catholic Church allow aquamation?
Yes. The Vatican issued guidance in 2023 explicitly permitting aquamation, alongside cremation and natural burial — with the same requirement for respectful treatment and final disposition of remains in a sacred place.
Is aquamation more eco-friendly than cremation?
Yes. Aquamation uses approximately 90% less energy than flame cremation, produces no combustion emissions, and releases no mercury from dental fillings. It has a significantly smaller carbon footprint than flame cremation, and is second only to natural burial or human composting in environmental impact.
What do aquamation remains look like?
Aquamation returns a white or cream-colored powder — typically greater in volume than flame cremation remains, because the bones are not incinerated but only cleaned of soft tissue. The powder can be handled the same way as flame cremation ash: kept, scattered, buried, or incorporated into memorial products.
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