If you are asking “Is aquamation legal in Washington?”, the short answer is: Yes, human aquamation is fully legal and operational in Washington state.
Aquamation, scientifically known as alkaline hydrolysis or water cremation, was legalized by the Washington State Legislature under RCW 68.04.290 and RCW 68.50.110 (taking effect in May 2020). Washington is widely recognized as a pioneering state in eco-friendly disposition choices, authorizing both alkaline hydrolysis and natural organic reduction (human composting) alongside traditional flame cremation and earth burial.
As families across Seattle, Spokane, Tacoma, Vancouver, Bellevue, and Olympia seek gentle, green alternatives for final disposition, water cremation is an established and accessible choice statewide.
This 2026 guide explains Washington’s aquamation laws, environmental benefits, average costs, and key tips for selecting an urn for bone ash remains.
Washington Aquamation Laws at a Glance
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Human Remains Legal Status: Legal statewide and regulated under Revised Code of Washington (RCW) Title 68.
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Pet Remains Legal Status: Legal and widely accessible through private pet aftercare providers and veterinary networks statewide.
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Regulatory Body: Washington State Funeral and Cemetery Board (under the Washington Department of Licensing).
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Location Requirements: Must be performed in a licensed hydrolysis facility adhering to WAC Chapter 308-47 operating standards.
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Final Returned Remains: Pure, pale white bone powder.
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Volume Yield: Yields approximately 20% to 30% more ash volume than traditional flame cremation.
What Is Aquamation (Water Cremation)?
Aquamation also called green cremation, bio-cremation, liquid cremation, or flameless cremation is a gentle, water-based final disposition method.
Instead of using direct high heat and fossil fuels to reduce human remains, aquamation uses a solution of 95% warm water and 5% alkali (potassium hydroxide or sodium hydroxide). Over a 6- to 12-hour cycle inside a sealed pressure vessel, gentle liquid flow and natural alkalinity accelerate the body's natural breakdown process.
At the end of the process, only soft, mineral bone fragments remain. These fragments are dried and processed into a fine white powder that can be safely kept at home, buried, or scattered.
Aquamation vs. Traditional Cremation: Key Differences
| Feature | Aquamation (Water Cremation) | Traditional Flame Cremation |
| Primary Method | 95% Water & 5% Alkali Solution | Direct High Heat / Open Flame |
| Energy Consumption | Uses ~90% less energy | High fossil fuel consumption (natural gas/propane) |
| Emissions | Zero direct greenhouse gas stack emissions | Direct carbon dioxide and thermal emissions |
| Returned Remains | Fine, pale white powder | Coarser, gray bone ash |
| Ash Volume | ~20% to 30% greater returned volume | Standard baseline volume |
How Much Does Aquamation Cost in Washington?
In Washington, aquamation pricing varies depending on regional provider availability and service package selection:
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Direct Human Aquamation: $1,500 – $3,500 (varies by provider, location, and inclusive packages)
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Full-Service Aquamation (with Memorial Services): $3,500 – $6,000+
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Pet Aquamation: $150 – $450 (varies by pet weight)
Direct aquamation is competitively priced alongside traditional flame cremation while offering a significantly smaller environmental footprint.
Choosing an Urn for Aquamation Remains
Because aquamation preserves more bone material than high-heat incineration, the returned remains typically occupy 20% to 30% more space than standard flame cremation ashes.
When shopping for an adult memorial vessel, keeping internal capacity in mind is crucial:
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Adult Full-Sized Urns: Look for urns with a volume capacity of 220 to 250+ cubic inches (rather than the standard 200 cu. in.) to comfortably accommodate aquamated ashes.
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Keepsake Urns: Small mini urns designed to hold a small portion of ashes, allowing multiple family members to share a token memory.
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Cremation Jewelry: Keepsake pendants and bracelets engineered with tiny inner chambers to carry a small piece of your loved one near your heart.
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Water-Soluble & Scattering Urns: Specially designed for natural ash-scattering ceremonies along Puget Sound, the Pacific Coast, or on private land.
Frequently Asked Questions (FAQ)
Is aquamation eco-friendly?
Yes. Water cremation produces zero direct stack emissions, uses roughly 10% of the energy of flame cremation, and returns safe, pathogen-free water to municipal wastewater treatment systems in compliance with environmental standards.
Can I keep aquamation ashes at home in Washington?
Yes. Washington law permits families to bring returned cremated remains home, place them in a columbarium niche, bury them in a cemetery, or scatter them on private property with landowner permission.
What size urn do I need for water cremation ashes?
A standard cremation urn typically holds 200 cubic inches. For aquamation remains, selecting an urn rated for 220+ cubic inches ensures all returned ashes fit comfortably.
Find the Right Memorial Container for Your Loved One
Choosing final arrangements is a tender and personal process. Whether selecting traditional flame cremation, natural organic reduction, or green water cremation, explore Trupoint Memorials’ Collection of Cremation Urns to find a handcrafted, beautifully protective vessel for your loved one.
Disclaimer: Information regarding state statutes, funeral industry regulations, and legal statuses is accurate and up to date as of September 2026. Funeral laws and local facility availabilities are subject to change over time. Readers are encouraged to verify current local regulations with the appropriate state licensing boards or licensed funeral professionals.