Terramation Soil Testing and Quality Assurance: What NOR Operators Need to Know (colloquially referred to as human composting)

Natural organic reduction produces soil that is tested — by regulatory requirement — for pathogens, heavy metals, and physical contaminants before it is returned to families. In Washington State, WAC 246-500-055 mandates specific testing parameters and passing thresholds for every batch of reduced remains, including fecal coliform and salmonella limits drawn directly from EPA Class A biosolids standards. Operators in other legal states face analogous obligations as those regulatory frameworks mature. Understanding what gets tested, why it matters, and what a rigorous quality assurance process looks like is not optional for NOR providers — it is the foundation of family trust and regulatory standing.

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Why Soil Testing Is Central to NOR Operations

When a family chooses terramation, they are entrusting your facility with an irreversible process that ends in soil — approximately one-half cubic yard of material representing a person’s entire remains. The question families will ask, and should ask, is: Is this safe?

The answer is documented through testing. Unlike flame cremation, where the output is inert ash with a minimal microbial profile, natural organic reduction produces biologically active soil. That biological activity is the source of the soil’s environmental and agronomic value — Regenerative Living Soil™ is rich in nitrogen, phosphorus, potassium, and organic carbon — but it also means the process requires verified pathogen elimination to be safe for families to handle, plant with, and return to the earth.

Operators who can document a rigorous testing program are better positioned to communicate NOR’s safety story to families, satisfy state regulators, and differentiate their facility from providers whose quality assurance practices are less systematic. The compliance case and the marketing case point in the same direction: test thoroughly, document everything, and make the results accessible.

For a broader look at terramation’s environmental credentials and what families ask about, this article focuses specifically on the testing infrastructure operators should build or verify before offering NOR services.

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What Washington State Requires: WAC 246-500-055

Washington legalized natural organic reduction through SB 5001 in 2019, and the Washington State Department of Health subsequently developed the operational regulatory framework under WAC Chapter 246-500. The specific testing requirements for NOR are codified in WAC 246-500-055, which establishes Table 500-A: Testing Parameters.

Pathogen Testing

Every instance of reduced remains must be tested for either fecal coliform or salmonella — the same indicator organisms used in EPA Class A biosolids standards:

• Fecal coliform: fewer than 1,000 most probable number (MPN) per gram of total solids
• Salmonella spp.: fewer than 3 MPN per 4 grams of total solids

These thresholds are not arbitrary. They represent the EPA’s established Class A standard — the level at which treated organic material is considered safe for unrestricted use, including direct contact by the public. The NOR regulatory framework in Washington adopted these numbers because they align with the best-understood analogous science available: composted biosolids regulation, which the EPA has developed and refined for decades.

Heavy Metal Limits

WAC 246-500-055 also requires testing for five heavy metals, with the following maximum concentrations (measured in milligrams per kilogram dry weight):

Metal	Maximum Limit
Arsenic	≤ 20 ppm
Cadmium	≤ 10 ppm
Lead	≤ 150 ppm
Mercury	≤ 8 ppm
Selenium	≤ 18 ppm

These limits are relevant because human remains can carry trace heavy metal accumulation from dental amalgams (mercury), environmental exposure (lead, arsenic), and medical devices. A properly run NOR process produces soil that meets these thresholds. Operators should be aware that dental fillings and medical implants are typically removed before or during processing to avoid contaminating the output — this is standard practice in the field and supports passing results on the heavy metals panel.

Physical Contaminant Standards

Beyond microbial and chemical testing, WAC 246-500-055 requires that reduced remains contain fewer than 0.01 mg/kg dry weight of physical contaminants — defined to include intact bone, dental material, and residual implant material. This requirement drives the secondary processing steps that responsible NOR operators use after the primary reduction cycle.

Testing Frequency

The regulation establishes a graduated testing schedule:

• Initial phase: The first 20 instances of reduced human remains at a facility must be tested comprehensively against all Table 500-A parameters.
• Ongoing phase: Once the initial threshold is reached, facilities must test at least 25% of monthly instances until 80 total reductions have met all requirements.
• Local authority: Local health jurisdictions retain the authority to require additional testing parameters beyond the state minimum.

This graduated approach is designed to verify that a new facility’s process is reliably meeting standards — not just getting lucky on one batch — before transitioning to a reduced monitoring cadence.

For operators evaluating their compliance obligations in depth, the operations and compliance resources at cover related licensing, documentation, and recordkeeping requirements that accompany NOR authorization.

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The Testing Method: How Samples Are Collected

WAC 246-500-055 specifies that facilities must collect samples representative of each reduction instance using a scientifically valid method. The regulation references the U.S. Composting Council’s Test Methods for the Examination of Composting and Compost (TMECC), Method 02.01-A through E, as one accepted sampling approach. TMECC is a jointly developed USDA and U.S. Composting Council protocol that governs how samples are taken, preserved, and prepared for laboratory analysis.

Proper sampling methodology matters because the soil output of an NOR process is not uniform — it will have been mixed, processed, and screened, but representative sampling across the batch is required to produce a defensible result. A single grab sample from the top of a vessel would not be adequate. Composite sampling that reflects the full volume of reduced material is the appropriate approach.

Operators should contract with accredited environmental laboratories that have experience analyzing biosolids or composted organic material. These labs will be familiar with EPA Method 1682 (Salmonella in Class A biosolids) and EPA Methods 1680/1681 (fecal coliforms in biosolids) — the validated testing methods designed for this type of organic material.

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Beyond Washington: What Other Legal States Require

Washington remains the most mature regulatory environment for NOR in the United States, having had operational facilities since 2021. Colorado, which legalized NOR through SB 21-006 in 2021, has developed its own state-level regulatory framework. Oregon, Vermont, California, New York, Nevada, Arizona, Maryland, Delaware, Minnesota, Maine, Georgia, and New Jersey have each passed enabling legislation, and regulatory implementation varies by state.

Operators outside Washington should assume that soil testing requirements similar to Washington’s framework will apply as state agencies develop their NOR operational rules. The EPA Class A biosolids standards are the logical baseline regulators across jurisdictions are likely to adopt — they represent the established science for pathogen reduction in treated organic material.

As a practical matter: review your state’s enabling legislation and any agency guidance published to date, treat WAC 246-500-055 as the operational model most likely to be referenced by other states, and begin testing against Washington’s parameters as a conservative baseline even before a state-specific rule is finalized.

For the full regulatory compliance picture, see how terramation works for a process-level overview that provides context for why each compliance step is structured as it is.

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What Operators Should Require of an NOR Partner or In-House Process

If your funeral home is evaluating a third-party NOR facility partnership rather than building an in-house process, the quality assurance program is a key due diligence item. Ask prospective NOR partners for:

Documentation of testing results. Request historical test reports for fecal coliform or salmonella, heavy metals panel, and physical contaminants. A credible operator will provide these without hesitation. Batch-level test results should be traceable to specific dates and instances.

Laboratory accreditation. Confirm that the laboratory conducting analysis is accredited under a recognized program — for example, the NELAP (National Environmental Laboratory Accreditation Program) or an equivalent state accreditation program. Accreditation ensures the laboratory’s analytical methods and quality controls meet a documented standard.

Sampling methodology disclosure. Ask how samples are collected and whether the method follows TMECC or a comparable validated protocol. A facility that cannot describe its sampling method has not implemented a defensible QA program.

Regulatory compliance record. Ask whether the facility has had any regulatory citations, corrective action plans, or instances where test results did not meet Table 500-A parameters. Understanding how a facility has responded to out-of-spec results is as informative as knowing it has produced passing results.

Testing frequency above the regulatory minimum. Some NOR operators test every instance rather than meeting the minimum 25% frequency once past the initial 20. Higher-frequency testing produces more data, catches process deviations earlier, and provides more documentation to share with families.

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Communicating Testing Results to Families

The testing framework described above is a compliance requirement — but it is also a marketing asset. Families who choose terramation are engaged with the environmental and ecological dimensions of end-of-life decisions, and many will want to know the soil they receive is safe to use in a garden, spread in a meaningful landscape, or donate to a land conservation project.

An operator who can show families a certificate of analysis demonstrating that the soil passed pathogen and heavy metal testing is offering something no other disposition method produces: documented, laboratory-verified confirmation of the material’s safety and quality. Flame cremation ash is not tested. Green burial produces no soil product at all. NOR operators who communicate their testing program clearly — without overwhelming families with regulatory jargon — have a genuine differentiator.

The appropriate message for families is straightforward: terramation soil is tested to the same safety standards as composted material approved for unrestricted public use, analyzed by an accredited laboratory, and the results are documented and available.

For families planning to use the soil in a garden or on plants, the companion article on terramation soil safety for gardens and plants covers practical considerations in accessible language suitable for sharing at the arrangement table.

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Building a Quality Assurance Program: Key Elements

For operators building an NOR program from the ground up, a functional quality assurance framework includes:

Standard Operating Procedures (SOPs). Written procedures for every step affecting output quality — vessel loading, temperature monitoring, cycle duration, secondary processing, and sampling — create the documented baseline against which deviations are identified.

Temperature and Process Records. WAC 246-500-055 does not specify temperature parameters for the reduction vessel itself, but the biological success of the process depends on maintaining adequate temperature and moisture conditions throughout the cycle. Logging these parameters provides evidence that process conditions were met before laboratory results are in hand.

Chain-of-Custody Documentation. From sample collection through laboratory result filing, each step should be documented with chain-of-custody forms and accession numbers tied to specific reduction instances — the audit trail regulators and families may request.

Corrective Action Protocols. Facilities need written procedures for what happens when a result does not pass: sequestering the affected material, investigating the process deviation, notifying the applicable health authority if required, and implementing corrective action before resuming production.

Recordkeeping and Retention. Maintain all test records for the minimum period required by state regulation, and consider retaining them longer. As NOR matures and regulatory scrutiny increases, complete historical documentation will be a meaningful operational asset.

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The Quality Assurance Case for TerraCare Partners

For funeral home operators evaluating NOR partnerships, the quality assurance program is not a back-office detail — it is the backbone of the service promise you make to families. A soil output that has been tested, verified, and documented supports every environmental claim you make in your marketing, every conversation you have with a family at the arrangement table, and every piece of content that positions your facility as an ecologically responsible choice.

Talk to TerraCare Partners about marketing terramation’s environmental benefits to your families. We can help you build the narrative around your NOR offering — including how to present quality assurance and soil testing in terms that resonate with eco-conscious families without overwhelming them with regulatory detail.

Schedule a discovery call to discuss your facility’s NOR readiness, quality assurance program design, and the environmental marketing strategy that turns compliance into a competitive advantage.

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Sources

1. Washington State Legislature — WAC 246-500-055: Human remains reduced through natural organic reduction. https://app.leg.wa.gov/wac/default.aspx?cite=246-500-055

2. Legal Information Institute (Cornell Law) — Wash. Admin. Code § 246-500-055. https://www.law.cornell.edu/regulations/washington/WAC-246-500-055

3. Washington State Legislature — WAC Chapter 246-500: Handling of Human Remains. https://app.leg.wa.gov/wac/default.aspx?cite=246-500

4. Washington State Legislature — SB 5001 (2019): Concerning human remains. https://app.leg.wa.gov/billsummary?BillNumber=5001&Year=2019

5. U.S. Environmental Protection Agency — Basic Information: Pathogen Equivalency Committee (Class A biosolids standards, fecal coliform and salmonella limits). https://www.epa.gov/biosolids/basic-information-pathogen-equivalency-committee

6. Colorado General Assembly — SB 21-006: Concerning the conversion of human remains to basic elements within a container using an accelerated process. https://leg.colorado.gov/bills/sb21-006

7. USDA Agricultural Marketing Service — Compost and Vermicompost in Organic Crop Production (NOP Handbook 5021, referencing TMECC testing protocols). https://www.ams.usda.gov/rules-regulations/organic/handbook/5021