Water cremation gently returns the body to its natural elements using heated water and alkali instead of flame, leaving the same ashes you would receive from a traditional cremation, with a fraction of the environmental footprint.
If you are weighing how you or a loved one might be laid to rest, you may have come across an unfamiliar term: water cremation. It goes by several names, including alkaline hydrolysis, aquamation, and sometimes flameless cremation or resomation. The idea can sound unusual at first, but the process is dignified, well-established in science, and increasingly available across the United States. This guide walks you through what it is, how it works, what it costs, and where it is legal, so you can make an informed and peaceful decision.
This article offers general information, not legal, financial, or medical advice. Laws and prices vary by state and provider, so please confirm details with a licensed funeral professional in your area.
What is water cremation?
Water cremation is a method of final disposition that uses a water-based chemical process to break the body down to its basic elements. Rather than the intense heat and flame of a traditional cremation, the body is placed in a stainless steel chamber filled with a solution of about 95 percent water and 5 percent alkali (usually potassium hydroxide or sodium hydroxide). The chamber is gently heated and sometimes pressurized, accelerating a natural process that would otherwise happen slowly in the soil.
The science behind it is called alkaline hydrolysis, the same chemistry that breaks down organic matter in nature. When the cycle is complete, the soft tissue has dissolved into a sterile liquid, and only the bone mineral remains. Those bones are then dried and processed into a fine, white ash that is returned to the family, just as with flame cremation.
How the process works, step by step
While each facility differs slightly, the process generally follows these stages:
- Preparation. The body is gently placed in the chamber, often wrapped in a biodegradable shroud or silk. No casket is required.
- The cycle. The chamber fills with the warm water-and-alkali solution. Depending on the system, temperatures range from about 200°F to 300°F. Lower-temperature systems take longer; higher-temperature, pressurized systems are faster.
- Hydrolysis. Over the course of the cycle, the solution breaks down soft tissue into a sterile, neutral liquid containing salts, sugars, amino acids, and peptides. The bone structure is left intact.
- Rinsing and drying. The remaining bone is rinsed and dried in a special unit.
- Processing. The dried bone is reduced to a fine powder and placed in an urn or temporary container for the family.
How long does it take?
Timing depends on the equipment. A high-temperature, high-pressure system can complete a cycle in 4 to 8 hours, while a low-temperature system may run 14 to 20 hours. Including paperwork, scheduling, and processing, families typically receive the remains within one to three weeks, similar to flame cremation.
What happens to the liquid?
The remaining liquid is sterile and contains no DNA or tissue. It is released into the wastewater system the same way other byproducts of medical and mortuary care are handled, where it is treated and returned to the water cycle. Some facilities instead use it as a nutrient-rich addition to memorial gardens. Many families find comfort in knowing nothing is burned and the body returns gently to the earth's natural systems.
Water cremation vs. flame cremation
If you are already comparing your options, you may find our overview of cremation vs. burial and the detailed cremation process explained helpful alongside this comparison.
| Factor | Water cremation | Flame cremation |
|---|---|---|
| Method | Heated water and alkali | Flame and intense heat (1,400–1,800°F) |
| Typical cost | $2,000–$3,500 | $1,000–$3,000 |
| Energy use | About 1/8 the energy | Higher; uses natural gas |
| Carbon footprint | Up to ~75% lower | Higher; emits CO₂ |
| Remains returned | White ash (slightly more volume) | Gray-white ash |
| Availability | ~28 states, growing | Nationwide |
What it costs
Water cremation generally runs $2,000 to $3,500, often a few hundred dollars more than flame cremation in the same market. The premium reflects the specialized equipment that fewer providers own and, in some cases, the cost of transporting the body to a facility that has a machine. As more funeral homes adopt the technology, prices are gradually coming down. To put these numbers in context, compare them against our breakdowns of cremation costs and overall funeral costs.
Whatever method you choose, ask the provider for an itemized general price list. Under the federal Funeral Rule, funeral homes must give you one, which makes it easy to compare apples to apples.
Environmental benefits
For many families, the appeal of water cremation is ecological. Compared with flame cremation, alkaline hydrolysis:
- Uses roughly one-eighth the energy.
- Produces no direct greenhouse gas emissions and can cut the overall carbon footprint by up to 75 percent.
- Releases no mercury vapor from dental fillings, a known concern with flame cremation.
- Requires no embalming chemicals and no casket.
For those drawn to gentler, lower-impact options, it sits naturally alongside choices like green burial and human composting, both of which prioritize a smaller environmental footprint.
What is returned to the family
One common worry is whether families still receive ashes, and the answer is yes. Because nothing is burned, the bone mineral remains fully intact and is processed into a fine powder. These remains are typically whiter and slightly greater in volume than flame cremation ashes. You can keep them in an urn, bury them, scatter them, or turn them into memorial jewelry, exactly as you would with traditional ashes. If you are unsure of your options, our guide on what to do with cremation ashes can help.
Where water cremation is legal in the US
As of 2026, alkaline hydrolysis is legal in roughly 28 states, and the list grows almost every legislative session. States that permit it include California, Florida, Colorado, Illinois, Minnesota, Oregon, Washington, Georgia, Maine, Kansas, and many others. A handful of states allow it only for body or anatomical donation programs, and some have legislation pending.
Importantly, legality does not always mean availability. Even in states where the practice is legal, a facility with the right equipment may not exist nearby, so a body might need to be transported across state lines. The most reliable step is to call a local funeral home or dedicated aquamation provider and ask two questions: Is it legal here, and do you have access to a machine? They can confirm current status and arrange logistics. As you make arrangements, our guide to planning a funeral and funeral pre-planning walks you through the broader steps.
Is water cremation right for you?
Water cremation appeals to people who want a gentle, low-impact farewell that still produces ashes for the family to keep or scatter. It may be worth considering if environmental values matter deeply to you, if you find the idea of flame uncomfortable, or if you simply want to understand every option before deciding. Talking it through with loved ones now, perhaps as part of broader end-of-life planning, spares your family from having to guess later. Whatever you choose, the goal is the same: a respectful, meaningful goodbye that reflects who you are.