Q&A

Less than the internet suggests, but not zero. Peer-reviewed studies have found trace formaldehyde in soil and groundwater down-gradient of cemeteries^[reference], and a 2024 review in Environmental Health Insights confirmed that cemeteries do produce a measurable leachate plume containing chloride, ammonium, pathogens and trace embalming chemicals^[reference]. The same review concluded that the actual human health risk from formaldehyde reaching drinking-water wells is low under modern cemetery-siting practice. The people at highest exposure risk are embalmers themselves, occupationally — not neighbours. If you live near a cemetery on a private well, the standard advice is periodic well testing; the exposure risk is not the headline it is sometimes made to be.

Most of what shows up in the cemetery groundwater plume is not the body — it is what was buried with it. Peer-reviewed comparisons find metal caskets leach iron, copper, lead and zinc (especially in acidic soil), and varnished or laminated wood caskets contribute wood-finish chemicals and adhesives^[reference]. Industry summaries of the research put it plainly: the cemetery plume is "attributable to what goes in the grave, not the body… metals, irons, and wood finishes from the casket"^[reference]. This is the strongest available argument for natural burial: removing the metal casket, the chemical finishes, the embalming fluid and the concrete vault removes most of what actually contaminates the plume.

Honest answer: unresolved, but the emerging picture may actually favour aquamation. PFAS are highly resistant to conventional degradation and pass through most municipal wastewater treatment plants largely intact^[reference]. In flame cremation, incineration temperatures may not fully destroy all PFAS and can produce shorter-chain PFAS byproducts. Interestingly, a closely related technology — Hydrothermal Alkaline Treatment (HALT) — is currently being studied as an active PFAS-destruction method precisely because high-temperature alkaline conditions can defluorinate PFAS^[reference]. Funeral-grade aquamation systems have not yet been formally characterised for PFAS fate, so this is a genuinely open research question — not a settled advantage or disadvantage.

CO₂ is the headline, but not the whole story. Peer-reviewed Canadian air-quality data attributes roughly 6% of national mercury emissions, 5% of national dioxin and furan (PCDD/F) emissions, and 0.25% of PM2.5 to crematoria^[reference]. The US EPA's 2020 National Emissions Inventory also documents nitrogen oxides (NOx), sulphur dioxide (SO₂), volatile organic compounds and carbon monoxide from cremation as a sector^[reference]. UK crematoria have been required to install mercury abatement equipment since the mid-2000s; US regulation is inconsistent by state, and dioxin controls are rare. This is the honest version of "cremation is cleaner than burial" — it is often lower on carbon, but it is not a clean stack.

The effluent — sterile water, salts, amino acids, peptides and sugars — is cooled and released to the municipal sanitary sewer, where it is treated alongside ordinary wastewater. There are two things worth knowing. First, the process is so chemically aggressive that it destroys things flame cremation does not — including infectious prions (the proteins responsible for Creutzfeldt-Jakob and BSE), which is why the USDA and veterinary/biosecurity facilities adopted alkaline hydrolysis for pathogen-containing carcass disposal before the funeral industry did^[reference]. It also chemically breaks down most pharmaceutical residues. Second, the peer-reviewed LCA that gives aquamation its strong carbon numbers explicitly did not fully model effluent chemistry or downstream wastewater-treatment impacts^[reference]. Municipal wastewater plants accept the effluent routinely, but a full LCA of the water side of the process is still outstanding.

Almost never — but for regulatory reasons, not because the soil is unsafe. Recompose's pilot study with Washington State University tested the finished material for arsenic, cadmium, copper, zinc, lead and mercury and found all levels well under EPA limits, meeting or exceeding standards for regulated compost^[reference]. The material is third-party tested for pathogens and physical contaminants (dental fillings, surgical hardware, medical devices) before release. However, most state statutes that legalised NOR explicitly restrict the finished soil from being used to grow crops intended for human consumption. Families typically receive the soil for garden or forest use, or donate it to conservation projects such as reforestation on protected land. "Safe" and "legally cleared for lettuce" are two different questions.

They are handled, quietly and routinely, before or after the process. Pacemakers and implanted defibrillators (ICDs) must be removed before flame cremation — their lithium batteries explode at cremation temperatures and can cause structural damage inside the retort; a UK study found roughly half of surveyed crematoria had experienced pacemaker explosions^[reference]. Removal is done by the funeral director or medical staff, takes minutes, and is standard practice. After flame cremation, surgical metal (titanium hip and knee replacements, plates, screws) is separated magnetically or manually from the bone fragments and recycled — most large crematoria work with medical-metal recyclers. In aquamation the same metals emerge intact, uncorroded, and are similarly separated. Dental amalgam is the source of the mercury emitted in flame cremation; it is not removed in advance because doing so is invasive and impractical.

In practice, no. Peer-reviewed urban-planning literature increasingly frames conventional cemetery land as a perpetual, non-reversible land commitment — a permanent land use inside dynamic urban and rural land systems^{[reference][reference]}. This is the concrete reality behind the peer-reviewed LCA finding that burial's total shadow price runs about 30% higher than cremation once land use is counted^[reference]. It is also why conservation burial flips the argument: instead of a cemetery permanently locking up land against other uses, the burial fee funds a legally binding conservation easement that permanently protects the land as habitat^[reference]. Same permanence — very different environmental ledger.

Yes, in every US state. The FTC Funeral Rule specifically requires funeral homes to disclose that embalming is not legally required in most circumstances^[reference], and the industry-standard alternative — refrigeration, sometimes combined with dry ice — is available at essentially every funeral home. A short-window viewing (24 to 72 hours) with refrigeration is entirely routine. Longer delays, cross-state transport, or certain communicable-disease cases are the narrow situations where embalming may genuinely be required. The persistent messaging that "you need to embalm for the family to say goodbye" is a sales artifact, not a legal or biological one.