Are Biodegradable Urns Safe for the Ocean? What Families Should Know
Are Biodegradable Urns Safe for the Ocean? What Families Should Know
You've decided on a water ceremony. You've chosen a place that matters. But before you place anything in the ocean, there's a question sitting quietly in the back of your mind: Will this harm the water?
It's a good question. And the fact that you're asking it tells me something about you: you care about the ocean as much as you care about the person you're honoring. You want this farewell to be gentle in every direction, not just for your family, but for the water itself.
The short answer is no. A properly made biodegradable urn will not harm the ocean, the marine life, or the ecosystem. Here's why, in plain language, so you can move forward with confidence.
What Biodegradable Urns Are Made Of
Not all biodegradable urns are made from the same materials, so it's worth knowing what's in the one you're choosing.
Pachamama urns are crafted from 100% natural materials: cotton, plant fibers, natural paper, and tissue paper. No plastic. No synthetic glue. No metal. No chemical dyes. Every component is non-toxic, sustainably sourced, and designed to decompose without leaving residue of any kind.
The biodegradable ashes bag inside the urn is water-soluble. It dissolves within 1 to 2 minutes of contact with water, releasing the ashes gently beneath the surface. The urn itself softens, breaks apart, and fully integrates with the water over the following hours to days, depending on temperature and wave action.
When the process is complete, nothing remains that doesn't already belong in the ocean. No fragments. No fibers. No trace. If you're curious about what the full process looks like, I wrote a detailed walkthrough of what happens when you place a biodegradable urn in water.
What Cremated Ashes Actually Are
This is the part most articles skip, but it matters. Cremated remains are not "ashes" in the way most people imagine. They're not like fireplace ash or wood ash. They're processed bone fragments, ground into a fine powder that is primarily composed of calcium phosphate and other inert minerals.
Calcium phosphate is a naturally occurring mineral found in rocks, soil, and ocean water. It's the same compound that makes up the structure of coral reefs, seashells, and the bones of marine animals. When cremated remains are released into the ocean, the minerals disperse and become part of the existing mineral content of the water. They don't introduce anything foreign or toxic.
Cremated remains are also sterile. The cremation process occurs at temperatures exceeding 1,400 degrees Fahrenheit, which eliminates all biological material, pathogens, and organic compounds. What remains is mineral powder. It's as inert as sand.
What the EPA Says
The U.S. Environmental Protection Agency regulates the placement of cremated remains in ocean waters under the Marine Protection, Research, and Sanctuaries Act (MPRSA). The EPA's general permit for burial at sea allows the scattering or placement of cremated remains in ocean waters under specific conditions.
The key requirements are: the ceremony must take place at least three nautical miles from shore, only biodegradable materials may be placed in the water, and the EPA must be notified within 30 days. No flowers, wreaths, or other items may be included unless they are fully biodegradable.
The fact that the EPA permits this practice, with the specific requirement that materials be biodegradable, confirms that properly made biodegradable urns are considered safe for ocean placement by the federal agency responsible for protecting U.S. waters.
For our complete legal guide, including the notification form and step-by-step instructions, visit our burial at sea resources page.
What About Marine Life?
This is the concern that keeps the most environmentally conscious families up at night. Will a fish eat the ashes? Will the urn material harm sea creatures? Will the ceremony disrupt the ecosystem?
The answer, across all three questions, is no.
The minerals in cremated remains are the same minerals already present in ocean water. Marine organisms encounter calcium phosphate constantly. It's a building block of their own skeletal structures. Introducing a small amount of additional mineral powder into a vast body of water produces no measurable effect on the local ecosystem.
The urn materials, cotton and plant fibers, are organic matter that marine microorganisms break down the same way they break down seaweed, driftwood, and other natural debris. The biodegradable ashes bag is made from plant-based material that dissolves completely, leaving no microplastics, no synthetic residue, and no persistent particles.
There is no documented case of a biodegradable water urn causing harm to marine life. The materials are too similar to what the ocean already contains to register as a disruption.
What Should NOT Go in the Water
While a biodegradable urn and cremated ashes are safe, not everything families bring to a ceremony belongs in the ocean. It's worth being clear about what to avoid.
No plastic of any kind. Not in bags, not in decorations, not in the urn's construction. If your urn came with a plastic bag for the ashes, replace it with a biodegradable one before the ceremony. Pachamama kits include a water-soluble bag specifically for this reason.
No synthetic flowers or ribbons. Silk flowers, polyester ribbon, and synthetic confetti do not dissolve. They become marine debris. Use only natural, biodegradable materials. Dried flower petals are a beautiful and fully biodegradable alternative.
No metal, glass, or ceramic. Some families want to include keepsakes or mementos. If it doesn't dissolve in water, it doesn't belong in the ceremony. You can keep those items in a keepsake urn at home instead.
No traditional urns. A metal, ceramic, or stone urn placed in the ocean will sink to the bottom and remain there indefinitely. This is not permitted under EPA regulations and it is harmful to the marine environment. Only biodegradable urns are suitable for water ceremonies.
What About Lakes and Rivers?
The environmental safety question applies equally to freshwater. The same principles hold: biodegradable materials dissolve without residue, and cremated remains are inert minerals that don't harm aquatic ecosystems.
The legal requirements are different, however. Lakes and rivers are regulated by state and local authorities, not the EPA's ocean burial permit. Most states allow the scattering of cremated remains in freshwater using biodegradable materials, but specific rules vary. Check with your state's environmental agency before the ceremony to confirm local requirements.
From an environmental perspective, the considerations are the same. Use only biodegradable materials. Don't add anything synthetic. Let the ceremony be as gentle on the water as it is on your heart.
How to Know Your Urn Is Truly Biodegradable
Not every product labeled "eco-friendly" or "green" is genuinely biodegradable. Some urns use laminates, synthetic coatings, or mixed materials that slow or prevent natural decomposition. Here's what to look for.
Check the materials list. A truly biodegradable urn will list natural materials only: cotton, plant fibers, recycled paper, sand, salt, or clay. If you see words like "laminate," "coating," "resin," or "composite" without further explanation, ask the manufacturer what those terms mean.
Ask about the ashes bag. The bag that holds the cremated remains inside the urn must also be biodegradable. If it's plastic, it won't dissolve and will remain in the water indefinitely. Pachamama kits include a water-soluble bag made from plant-based material that dissolves in 1 to 2 minutes.
Look for a Certificate of Biodegradability. Reputable manufacturers provide documentation confirming that their products meet biodegradability standards. Every Pachamama kit includes a certificate accessible via QR code, which is the same documentation cruise lines require for ocean ceremonies.
If you want to see the full breakdown of what makes an urn genuinely biodegradable, our article on what a biodegradable urn looks like covers materials, construction, and what to expect when you hold one in your hands.
The Ocean Doesn't Mind
I want to leave you with this. The ocean has been receiving the dead since the beginning of human history. Burial at sea is one of the oldest traditions on earth. Sailors, seafarers, coastal communities, and cultures around the world have returned their loved ones to the water for centuries.
A biodegradable urn is simply the modern expression of that ancient practice, made with materials that dissolve the way a leaf dissolves, the way driftwood softens, the way everything natural eventually returns to where it came from.
The ocean doesn't mind. It's been doing this work for a very long time.
If you're planning a water ceremony and want to know what the entire experience looks like, from the drive to the water to the silence after the urn disappears, I wrote a full walkthrough. And if you're considering doing it from your own boat or from a cruise ship, those guides cover the specific logistics for each.
The ceremony doesn't need to be perfect. It needs to be yours. And the ocean will hold whatever you offer.
Frequently Asked Questions About Biodegradable Urns and Ocean Safety
Will a biodegradable urn harm marine life? No. Biodegradable urns made from natural materials like cotton, plant fibers, and paper break down the same way seaweed and driftwood break down. The minerals in cremated remains are the same minerals already present in ocean water. There is no documented case of a biodegradable urn harming marine life.
Are cremated ashes toxic to the ocean? No. Cremated remains are primarily composed of calcium phosphate, an inert mineral that occurs naturally in ocean water, coral reefs, and the bones of marine animals. The cremation process eliminates all biological material, leaving only sterile mineral powder that disperses harmlessly in water.
Does the EPA allow biodegradable urns in the ocean? Yes. The EPA's general permit for burial at sea specifically allows the placement of cremated remains in ocean waters at least three nautical miles from shore, provided only biodegradable materials are used. This federal authorization confirms that properly made biodegradable urns are considered safe for ocean placement.
How do I know if my urn is truly biodegradable? Check the materials list for natural-only components such as cotton, plant fibers, recycled paper, sand, or salt. Confirm the ashes bag is also biodegradable. Look for a Certificate of Biodegradability from the manufacturer. Avoid urns with laminates, synthetic coatings, or plastic components.
Can I scatter dried flower petals in the ocean during the ceremony? Yes. Dried flower petals made from real flowers are fully biodegradable and safe for ocean water. Avoid synthetic flowers, silk petals, or any material that does not dissolve naturally.
What about placing a biodegradable urn in a lake or river? The same environmental safety applies. Biodegradable materials and cremated remains are safe for freshwater. Legal requirements vary by state, so check with local authorities before the ceremony. Our lake and river scattering guide covers the specifics.
Is it safe to use a traditional urn for an ocean ceremony? No. Traditional urns made from metal, ceramic, or stone will not dissolve. They will sink to the ocean floor and remain there indefinitely, contributing to marine debris. The EPA requires that only biodegradable materials be placed in ocean waters. A biodegradable urn is the only legal and environmentally responsible option for water ceremonies.
Do Pachamama urns come with proof of biodegradability? Yes. Every kit includes a QR code that links to a Certificate of Biodegradability confirming that the urn and ashes bag meet environmental standards. This certificate is the same documentation required by most cruise lines for ocean scattering ceremonies.
With warmth,
Virginia