nor education 10 min read

By TerraCare

Terramation pH Levels and Soil Chemistry (colloquially referred to as human composting)

The soil produced through terramation — natural organic reduction (NOR) — is genuinely nutrient-rich and, when well-processed, lands in a pH range similar to high-quality compost. Understanding the soil chemistry matters for families who want to use that soil meaningfully: to nourish a garden, support a tree, or contribute to a conservation area. This article breaks down what happens to pH during the NOR process, what the finished soil contains, and how families can use it safely.

What is the pH of terramation soil and what nutrients does it contain?

Well-processed NOR soil finishes in a pH range of 6.0–7.5 — similar to high-quality compost and suitable for most garden plants. It contains nitrogen (notably high, from protein breakdown), phosphorus (from bone and tissue mineralization), potassium, stable humic substances, and a living microbial community. Because of its high nitrogen content, NOR soil should be mixed with native soil rather than applied in concentrated form directly to plant roots.

  • Finished NOR soil typically has a pH of 6.0–7.5 — neutral to slightly acidic, within the range that supports most garden plants and ecological restoration.
  • pH starts slightly acidic during early decomposition as organic acids form, then rises toward neutral-to-alkaline as the process matures.
  • NOR soil is notably nitrogen-rich from protein breakdown; phosphorus comes from bone mineralization; potassium comes from cellular breakdown.
  • The high nitrogen content means NOR soil should be mixed with native soil or compost before use — concentrated direct root contact can harm plants.
  • NOR soil is fundamentally different from cremation ash (pH ~11, inorganic, minimal plant value) — NOR soil is biologically active and genuinely nutrient-dense.
  • Responsible providers test finished soil for pathogens before release; families can also have soil independently tested through a university extension service for $20–40.

What Is pH and Why Does It Matter for Soil?

The pH scale runs from 0 to 14. A pH of 7 is neutral. Values below 7 are acidic; values above 7 are alkaline. Most garden plants thrive in slightly acidic to neutral soil — roughly pH 6.0 to 7.0. Outside that range, plants can struggle to absorb nutrients even when those nutrients are present in the soil.

For soil to be useful in gardens, under trees, or in ecological restoration areas, its pH needs to be in a plant-friendly range. Soil that is too acidic (below 5.5) or too alkaline (above 8.0) limits what can grow in it and may need amendment before use.

This is why NOR providers pay attention to pH as part of quality control — not just as a regulatory requirement, but as a practical measure of whether the finished soil will actually support plant growth.

What Happens to pH During the Terramation Process?

The NOR process moves through distinct phases, and the pH of the material inside the vessel shifts as those phases progress.

Early stages: slight acidification. As rapid microbial decomposition begins, organic acids form as byproducts of the biological activity. This is normal — the same thing happens in high-quality composting. During this early stage, the pH of the material may dip slightly acidic. This doesn’t indicate a problem; it’s a sign that active decomposition is underway.

Thermophilic peak: elevated temperatures, active chemistry. The thermophilic phase — where internal temperatures reach 130–160°F — is the most biochemically active part of the process. Microorganisms are breaking down proteins, fats, and carbohydrates at a high rate. The chemistry during this phase is complex, with multiple processes happening simultaneously. The heat itself supports pathogen elimination, and the rapid biological activity begins stabilizing the organic material.

Maturation: pH normalizes. As the process moves into its later stages and the material begins to stabilize, pH trends toward neutral. Well-processed NOR soil typically finishes in the pH 6.0 to 7.5 range — similar to finished compost. This is the range associated with productive, balanced soil.

The exact pH trajectory varies by provider, vessel design, the organic amendments used, and the individual body. This is one reason responsible NOR providers test finished soil rather than assuming it has reached the right parameters.

What Nutrients Does Terramation Soil Contain?

The finished soil from a terramation process contains the core macronutrients that define high-quality soil amendments: nitrogen, phosphorus, and potassium.

Nitrogen. NOR soil is notably nitrogen-rich. Human remains contain substantial protein, and protein breakdown releases nitrogen compounds into the soil. This is a genuine benefit — nitrogen is essential for plant growth — but it also means the soil can be too intense for direct planting in concentrated form. Applying high-nitrogen soil directly to plant roots, especially in large quantities, can burn tender root systems.

Phosphorus. Present in meaningful quantities. Phosphorus supports root development and energy transfer in plants. The phosphorus content in NOR soil comes largely from bone and tissue mineralization during the process.

Potassium. Also present, contributing to overall plant health and disease resistance.

In broad terms, the macronutrient profile of well-processed NOR soil is comparable to high-quality finished compost. It is a soil amendment with real agronomic value — not an inert filler.

The chemistry of terramation is covered in more depth in our article on The Chemistry of Terramation, which addresses the full biochemical process from a scientific perspective.

How Much Soil Does Terramation Produce?

A single terramation process yields approximately 1/2 cubic yard of soil. This is a meaningful quantity: enough to spread under several large trees, amend a garden bed of several hundred square feet, or contribute to an ecological restoration project.

Families often receive the soil in containers or biodegradable bags. Some providers divide the soil so families can use it in multiple locations. For more on how soil is returned to families and what containers are typically used, see Terramation Soil Return: Urns and Containers.

How Should Families Use Terramation Soil?

The pH and nutrient chemistry of NOR soil shapes how it should — and shouldn’t — be used.

As a soil amendment, not a standalone growing medium. NOR soil is not a substitute for potting mix or garden soil. Its nitrogen concentration can be too high for direct planting contact. The recommended approach is to mix it with native soil, compost, or garden soil — diluting the concentration while still benefiting from its nutrient contribution.

Under established trees and shrubs. Spreading NOR soil around the base of established trees and shrubs, working it into the top few inches of soil, is a low-risk approach that allows the soil to weather naturally and integrate with the existing ecosystem. Tree roots are generally more tolerant of higher nitrogen levels than delicate seedlings or vegetable plants.

In conservation and restoration areas. Families who want to contribute to ecological restoration can donate or scatter NOR soil in conservation areas, forests, or green spaces. The neutral pH and nutrient profile support reforestation and habitat restoration goals well. For more on this option, see Donating NOR Soil to Conservation Projects.

With some time for weathering. Some NOR providers recommend allowing the soil to sit and weather for a period before use in intensive gardening applications. Rain and natural microbial activity in the environment will continue to mature the soil and moderate its chemistry over time.

Avoiding direct root contact with concentrated soil. As noted above, the high nitrogen content means families should avoid placing large quantities of NOR soil directly against plant roots — particularly young or sensitive plants. Mixed into the broader soil environment, the chemistry normalizes and becomes beneficial rather than potentially harmful.

What Does Soil Testing Show?

Responsible NOR providers conduct pathogen testing on finished soil as part of their quality assurance process. Washington State’s regulatory framework, for example, requires that finished NOR soil meet specific safety standards before it is returned to families. Requirements vary by state; the state guides at TerraCare Partners cover what each legal state mandates for finished soil safety.

Some providers go further and test for nutrient levels — pH, nitrogen, phosphorus, potassium — so that the soil’s chemistry profile is documented. Families interested in a detailed chemical profile of the soil they receive can ask their provider whether nutrient testing is included, or they can have the soil tested independently through a university extension service or soil testing laboratory.

Independent soil testing is relatively inexpensive (often $20–40) and produces a detailed breakdown of pH, macronutrient levels, and sometimes micronutrient content. For families who intend to use the soil in a specific gardening or restoration context, having this data helps them make better decisions about how to apply it.

Is the Soil Safe for People, Pets, and the Environment?

When properly processed to regulatory standards, NOR soil is safe for use in gardens and outdoor environments. The thermophilic phase of terramation reaches temperatures that eliminate human pathogens — this is one of the critical quality benchmarks that NOR regulations require providers to demonstrate.

The environmental compatibility of NOR soil is part of why the method attracts families who care about ecological impact. Unlike conventional burial (which can introduce embalming chemicals into the soil) or cremation (which returns only inorganic mineral ash), terramation produces a biologically active, chemically complete soil amendment that integrates naturally into the surrounding environment.

For a full overview of how families are choosing to use NOR soil and what the research supports, the complete guide to natural organic reduction is the best starting point.

What pH is terramation soil when it’s returned to families?

Well-processed NOR soil typically falls in the pH 6.0 to 7.5 range — similar to finished compost and within the range that supports most garden plants. Exact pH varies by provider and individual case; responsible providers test finished soil before returning it.

Can I plant directly in terramation soil?

Not as a standalone medium. NOR soil’s nitrogen content is high enough that direct, concentrated contact with plant roots — especially tender seedlings or vegetable plants — can cause harm. The recommended approach is to mix it with native soil or compost to dilute the concentration, then apply it as a soil amendment rather than a primary growing medium.

Is terramation soil the same as cremation ashes?

No. Cremation ash is primarily inorganic mineral material — calcium phosphate — with no nitrogen content, a very high pH (around 11), and limited value as a soil amendment without significant dilution and pH correction. NOR soil is biologically active, nutrient-rich, and pH-neutral — fundamentally different in chemistry and use.

Does the soil contain any trace of the person’s DNA or pathogens?

When processed to regulatory standards, finished NOR soil should not contain viable pathogens. States that have legalized NOR require providers to demonstrate that finished soil meets safety benchmarks before it is returned to families. DNA degrades through the decomposition process; finished NOR soil does not contain intact genetic material.

Can terramation soil be used in a community garden or donated to a park?

Many families do use NOR soil in shared green spaces, and some choose to donate it to conservation or reforestation projects. Whether a specific park or community garden can accept donated soil may depend on local ordinances or the organization’s own policies. Providers can often help families identify conservation projects that actively accept NOR soil donations. See Donating NOR Soil to Conservation Projects for more.

Want to learn more about terramation providers in legal states and how the soil return process works? Learn more about terramation providers near you

If you’re considering terramation for yourself or a loved one and want guidance on what providers offer and how to get started, TerraCare Partners can help.

Ready to explore terramation options? Contact TerraCare Partners

Sources

  1. Washington State Legislature — WAC 246-500 (NOR Rules). https://app.leg.wa.gov/wac/default.aspx?cite=246-500
  2. USDA Natural Resources Conservation Service — Soil Health and Organic Matter. https://www.nrcs.usda.gov/conservation-basics/natural-resource-concerns/soil/soil-health
  3. U.S. Environmental Protection Agency — Composting. https://www.epa.gov/composting
  4. NFDA — Natural Organic Reduction Overview and Consumer Resources. https://nfda.org/
  5. Cornell Composting Science — Compost Physics. https://compost.css.cornell.edu/physics.html
  6. Washington State Department of Health — NOR Rules and Finished Soil Safety Requirements. https://doh.wa.gov/
  7. USDA Agricultural Research Service — Compost Chemistry and Nitrogen Dynamics. https://www.ars.usda.gov/
  8. WSU Extension — Soil Testing Resources and University Extension Services. https://extension.wsu.edu/
  9. Green Burial Council. https://www.greenburialcouncil.org/