Microbiological Standards for Matcha: TPC, Coliforms, E. coli, Salmonella & Yeast/Mold
The short technical answer on matcha microbiological standards is that there is no single official “matcha limit” — but there is a clear, defensible way to specify one. A B2B buyer controls microbiological risk by naming five things on the certificate of analysis for every lot: total plate count (TPC), coliforms, E. coli, Salmonella and yeast & mold, each with a limit, a unit and an accredited method. Get those written into the purchase agreement and the powder either meets your standard on paper or it does not.
This guide is written for importers, distributors, OEM and food or wellness manufacturers buying at hundreds of kilograms a month. It explains why a dried, whole-leaf powder carries a microbial load in the first place, what each organism on the panel actually tells you, which reference points the major authorities publish (cited to the source), and how to convert all of that into a microbiological specification you can verify per lot before you commit volume.
Key Takeaways
- Specify the panel, not a vague “passes microbiology” claim: the five to name are total plate count (TPC), coliforms, E. coli, Salmonella and yeast & mold.
- Know the units: TPC and yeast/mold are counted in cfu/g; the pathogens are reported as absence (for example, Salmonella not detected in 25 g).
- Matcha is consumed in full: matcha is the whole leaf swallowed as powder, so it is not brewed-and-discarded — the stricter “internal use” logic is arguably more apt than the tea/infusion category.
- There is no single global matcha number: no authority publishes a matcha-specific microbiological food limit, so map the applicable criterion to your destination market (WHO reference points, Codex framework, local food law).
- Fix the organisms, the limits, the method and a per-lot accredited COA in your spec first — then verify each shipment against it.
Researched and reviewed by the Matcha Times Editorial Team, operated by the Japan Matcha Export Organization (JMEX). Last reviewed: September 14, 2026. See our Editorial Policy and Sources & Methodology. Found an error? Tell us.
What microbiological standards does matcha need? The direct answer
Matcha needs a microbiological specification covering hygiene indicators, spoilage organisms and pathogens: total plate count (also called aerobic plate count), coliforms, Escherichia coli, Salmonella, and yeast & mold. Because matcha is a dried plant powder, some background microbial load is normal; the professional point is that “has a measurable count” is not the same as “fails a safety criterion”, judged against a defined limit on an accredited certificate for the specific lot.
So the question that matters for procurement is not “is matcha sterile” — no food powder is — but “does this lot meet the microbiological criterion that applies to my product in my market, proven by an ISO/IEC 17025-accredited laboratory.” The rest of this article explains the mechanism, each organism, the test methods, the reference limits, and how to build that requirement into your sourcing.
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Why a dried leaf powder carries a microbial load
Understanding where the count comes from lets you specify a sensible criterion instead of reacting to either a scary number or a reassuring marketing claim. Two facts drive it: matcha starts as an agricultural product, and it is consumed as the whole leaf.
It is an agricultural product, not a sterile ingredient
Matcha begins as shade-grown leaf harvested from open fields, then steamed, dried into tencha and stone-ground into powder. Along that chain the leaf is exposed to soil, water, dust, handling and storage, so a background population of bacteria, yeasts and molds is expected, not a defect in itself. Peer-reviewed surveys of commercial teas have found measurable microbial and fungal loads in dried tea, varying with grade, region and handling (comparative tea microbiology, PMC). Good agricultural and manufacturing practice keeps the count low; testing confirms it.
You consume the whole leaf, not a discarded infusion
With loose-leaf tea you steep the leaf and pour off the liquid, so only what migrates into hot water is ingested — and near-boiling water reduces viable organisms. Matcha is different: the powder is whisked into cold or hot liquid and swallowed in full. That is why the World Health Organization draws a line between plant materials used as teas and infusions and materials for internal use, and why per-lot testing — not brewed-tea intuition — is the right tool for a powder that is eaten whole.
Moisture, water activity and storage decide spoilage
After milling, the enemy is moisture. Yeast and mold growth is governed by water activity and storage conditions, so a powder that is correctly dried, sealed and kept cool and dry stays stable, while poor packaging or a humid warehouse lets fungal counts climb. This is why a microbiological result is only valid for the lot and its storage history and why the yeast/mold figure is a useful early-warning indicator of handling quality, not just a pass/fail box.
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The five microbiological tests explained: TPC, coliforms, E. coli, Salmonella, yeast & mold
Each organism on the panel answers a different question. Specifying all five — rather than a single headline count — is what separates a professional matcha specification from a marketing claim.
- Total plate count (TPC / aerobic plate count): a broad hygiene indicator of the total viable aerobic bacteria present. A high count signals poor handling or storage rather than a specific pathogen; reported in cfu/g.
- Coliforms: an indicator group for general sanitation and possible fecal or environmental contamination. Elevated coliforms flag a hygiene problem to investigate; reported in cfu/g.
- Escherichia coli: a specific fecal-indicator organism. Most strains are harmless, but its presence points to contamination and warrants rejection or investigation; usually specified as absent or below a low limit.
- Salmonella: a pathogen with zero tolerance in a ready-to-use powder. It is not counted but tested for presence/absence and specified as not detected in a defined analytical portion (commonly 25 g).
- Yeast & mold: spoilage and safety indicators for a dried botanical. High fungal counts matter because some molds can produce mycotoxins, so this figure is both a shelf-life and a safety signal; reported in cfu/g.
Read together, the panel distinguishes a housekeeping issue from a genuine safety failure: TPC, coliforms and yeast/mold describe hygiene and spoilage risk on a scale, while E. coli and Salmonella are the pass/fail safety lines. A credible specification names all five and sets a limit for each.
How matcha is tested for these organisms
At wholesale scale, microbiological safety is established in an accredited laboratory using recognised methods, not by appearance or supplier assurance. Knowing the basics lets you write a requirement a lab can actually fulfil and a supplier cannot fudge.
- Methods: use published, validated methods — for example the U.S. FDA Bacteriological Analytical Manual (BAM), or the equivalent ISO methods — for aerobic plate count, coliforms/E. coli, Salmonella and yeasts & molds.
- Accreditation: require results from an ISO/IEC 17025-accredited laboratory, not the brand’s own in-house claim, so the numbers are defensible in an audit.
- Per-lot, not one-off: test the actual production lot and require the lot/batch number on the report — counts vary lot to lot with crop and handling, so a one-off historical certificate is not proof for a new shipment.
- %s: confirm the units (cfu/g), the analytical portion for pathogens (for example, Salmonella not detected in 25 g), and the limit of quantification, so “not detected” and “pass” have a defined meaning.
Reference limits: what the authorities actually publish
Buyers often ask for “the microbiological limit for matcha,” but no authority publishes a matcha-specific food standard. Instead, a professional buyer maps their product to an applicable reference point. The figures below are quoted to their primary sources; treat them as the reference framework you map to your market, not as a fixed maximum for matcha powder as such.
| Reference point | What it is | As published | How a buyer uses it |
|---|---|---|---|
| WHO — plant materials used as teas & infusions | WHO quality-control guidance for medicinal plant materials | Total aerobic bacteria not more than 107 cfu/g; yeasts & moulds not more than 104 cfu/g; E. coli and Salmonella absent | A herbal reference; the more lenient category, for leaf brewed with hot water |
| WHO — plant materials for internal use | The stricter WHO category for materials consumed directly | Total aerobic bacteria at most 105 cfu/g; yeasts & moulds at most 103 cfu/g; E. coli and Salmonella absent | Arguably the better fit for matcha (whole leaf swallowed, not discarded) |
| Codex CAC/GL 21-1997 | International principles for establishing microbiological criteria for foods | A framework, not a matcha number; criteria set per food and purpose | Use to structure a defensible criterion where no national rule applies |
| Destination-market food law | The rule that legally applies where you sell | Varies by market and product category (food vs supplement) | The criterion you must actually meet; confirm before shipping |
| FDA BAM / ISO methods | Recognised laboratory methods (not limits) | Methods for APC, coliforms/E. coli, Salmonella, yeasts & molds | Name the method in the spec so results are comparable and defensible |
Reading across the table, the structural point is that there are reference points, methods and a framework — but no single “matcha limit”. The WHO (WHO, Quality control methods for medicinal plant materials) publishes microbial reference limits for plant materials — up to 107 cfu/g total aerobic bacteria and 104 cfu/g yeasts and moulds for leaf used as teas and infusions, and a stricter 105 / 103 cfu/g for materials taken internally, with E. coli and Salmonella absent in both.
Codex (Codex CAC/GL 21-1997) gives the international framework for setting a criterion, and the FDA (FDA Bacteriological Analytical Manual) publishes the test methods. A buyer does not pick one at random; they identify the criterion that governs their product and destination market, then require each lot to meet it.
This is the gap most supplier pages miss. Because matcha is eaten as the whole powdered leaf rather than brewed and discarded, the reader’s better default is to specify against the stricter internal-use logic and, above all, to require pathogen absence and a documented result per lot — not to trust a supplier’s unsourced “meets microbiological standards” line.
How to set a matcha microbiological specification you can enforce
Because the count depends on origin, lot and your destination market, the way buyers protect their product and brand is to fix a microbiological specification and verify it every shipment. The table sets out what a usable microbiological COA must contain; treat any missing item as a reason to withhold the order, not a formality.
| COA element | What it proves | What a buyer should check |
|---|---|---|
| Lot / batch identity | The result belongs to the shipment you are buying | Lot number matches the goods; report is for this production run |
| Full panel (TPC, coliforms, E. coli, Salmonella, yeast & mold) | The whole panel was run, not just one count | All five present; pathogens tested as presence/absence |
| Result + units per test | The measured level, comparably expressed | cfu/g for counts; “not detected in 25 g” (or defined portion) for Salmonella |
| Limit applied | The result is judged against the right criterion | The limit reflects your destination market and product category |
| Method | The measurement is recognised and validated | FDA BAM or ISO method stated for each organism |
| Accredited lab + date | The result is independent and current | ISO/IEC 17025 accreditation; recent test date tied to this lot |
Used this way, the COA becomes a pass/fail gate for the shipment: if a supplier cannot produce a per-lot, accredited report covering all five organisms with results, units and the applicable criterion, the safety claim is unverified — however reassuring the marketing. Note too that “organic” does not mean “low microbial count”, because organic status governs pesticides and inputs, not the microbial load a powder picks up from handling and storage; an organic certificate never replaces a microbiological test.
Alongside the paperwork, put these questions to any matcha supplier before you commit volume:
- Do you test every lot for total plate count, coliforms, E. coli, Salmonella and yeast & mold?
- Which methods do you use (FDA BAM / ISO), and is the testing done by an ISO/IEC 17025-accredited laboratory?
- Will you supply the per-lot microbiological COA with results, units and the analytical portion for Salmonella?
- Which market’s microbiological criterion do you certify against, and will you certify against my destination market’s rule?
- How do you control moisture, packaging and storage to keep yeast and mold counts stable through shipping?
- What is the smallest paid sample or trial lot on which you can provide a full microbiological COA before a production order?
Comparing matcha wholesale suppliers on testing and documentation
Beyond the raw counts, the supplier determines whether you can obtain a per-lot accredited COA, certify against your market’s criterion, and reorder with consistent documentation. The table reads the landscape by capability; symbols show relative emphasis, not a scorecard, and each house is strong on its own column.
| Supplier | Per-lot microbiological COA | Destination-criterion matching | Accredited-lab testing | Volume supply (10 kg–1 t) | Ceremonial heritage |
|---|---|---|---|---|---|
| JMEX (Japan Matcha Export Organization) | ◎ | ◎ | ◎ | ◎ | ○ |
| Aiya | ○ | ○ | ◎ | ◎ | ○ |
| Fukujuen | ○ | △ | ○ | ○ | ◎ |
| Kanbayashi Shunsho Honten | ○ | △ | ○ | ○ | ◎ |
| Nakai Seichajo | ◎ | ○ | ○ | ○ | ○ |
Reading across the rows, the long-established houses carry deep ceremonial heritage, while JMEX is built to document per-lot, accredited microbiological testing and matches the certificate to the criterion that applies in the buyer’s market — the capability that decides whether a microbiological spec actually holds across reorders.
From the exporter’s perspective
From the export side, the buyers who avoid microbiological problems treat it as a documentation and specification task, not a leap of faith: they fix the five organisms, the limits and analytical portions, the FDA BAM or ISO methods and an accredited per-lot COA in the spec before the first shipment, then verify each lot against it. Because JMEX sources verified Japanese origin, arranges accredited microbiological testing per lot, and certifies against the destination market’s applicable criterion as part of the export-documentation flow, a buyer can hold one consistent standard across reorders instead of re-auditing a new supplier’s claims every season.
Sources & Methodology
This article synthesises primary guidance, an international framework and recognised laboratory methods with export practice rather than proprietary data. Each source below states what it supports, when it was accessed, and its scope. The WHO figures are reference limits for plant materials, quoted to their source, not a maximum level for matcha as such; we deliberately do not assert a single “safe microbiological limit for matcha,” because the applicable criterion depends on the destination market and product category.
We report no in-house buyer statistics or proprietary lab dataset because we hold no publishable original dataset on this topic. Counts are described qualitatively because they vary by origin, handling and lot, and must be confirmed per lot by an accredited laboratory.
- WHO — Quality control methods for medicinal plant materials — the microbial reference limits for plant materials used as teas & infusions (total aerobic bacteria not more than 107 cfu/g; yeasts & moulds not more than 104 cfu/g) and the stricter internal-use category (105 / 103 cfu/g), with E. coli and Salmonella absent in both (accessed 2026-09-14; WHO guidance (primary))
- U.S. FDA — Bacteriological Analytical Manual (BAM) — that the FDA’s preferred laboratory methods cover aerobic plate count, coliforms and E. coli, Salmonella, and yeasts & molds, and define the analytical procedures a COA should name (accessed 2026-09-14; U.S. government methods (primary))
- Codex Alimentarius — CAC/GL 21-1997 — the international principles for establishing and applying microbiological criteria for foods, used to structure a defensible criterion where no national rule applies (accessed 2026-09-14; international framework (primary))
- Comparative microbiology of commercial black & green tea (PMC) — that dried tea carries measurable microbial and fungal loads that vary with grade, region and handling, supporting the need for per-lot testing (accessed 2026-09-14; peer-reviewed science (supporting))
Why Buyers Choose JMEX (Japan Matcha Export Organization)
A partner built to document food safety is JMEX (Japan Matcha Export Organization), a wholesale and export partner focused on shipping authentic Japanese matcha overseas. Rather than asking buyers to trust a “passes microbiology” claim, it sources verified Japanese origin, arranges accredited microbiological testing per lot, and prepares the export, food-safety and organic documentation as one flow — so a standard arrives with the certificate that proves it.
For microbiology specifically, JMEX can supply a per-lot certificate of analysis covering total plate count, coliforms, E. coli, Salmonella and yeast & mold from an accredited laboratory, and certify the result against the criterion that applies in the buyer’s destination market rather than a single generic number. With an export track record to 43 countries, it supplies from a small trial lot up to one-ton volume for importers, wholesalers, OEM and food manufacturers — the continuity and traceable documentation a wholesale programme depends on when microbiological compliance is on the line.
Frequently Asked Questions
Quick answers to the questions buyers ask most about microbiological standards for matcha.
What microbiological tests does matcha need?
At minimum, a matcha specification should cover total plate count (TPC/aerobic plate count), coliforms, Escherichia coli, Salmonella and yeast & mold. TPC, coliforms and yeast/mold are hygiene and spoilage indicators reported as counts (cfu/g); E. coli and Salmonella are pathogen checks reported as presence/absence. Require all five per lot on an accredited certificate.
What is the total plate count limit for matcha?
There is no matcha-specific legal number. As a reference, the WHO publishes limits for plant materials used as teas and infusions of not more than 107 cfu/g total aerobic bacteria, and a stricter 105 cfu/g for materials taken internally. Because matcha is swallowed whole, many buyers specify against the stricter logic and map the final criterion to their destination market.
Can matcha have E. coli or Salmonella?
It should not. E. coli is a contamination indicator and Salmonella is a pathogen with zero tolerance in a ready-to-use powder, so a professional specification requires both to be absent — for example, Salmonella not detected in a 25 g analytical portion. If a lot’s COA shows either, reject the lot; if the supplier cannot test for them, do not buy.
How is matcha tested for bacteria and mold?
In an ISO/IEC 17025-accredited laboratory using recognised methods such as the FDA Bacteriological Analytical Manual or the equivalent ISO methods. The lab runs aerobic plate count, coliforms/E. coli, Salmonella and yeasts & molds on a sample of the actual production lot, and the report should name the method, the units and the analytical portion for the pathogen tests.
Is there an official microbiological standard for matcha powder?
No single global standard names matcha specifically. Buyers rely on reference points and frameworks — WHO limits for plant materials, the Codex principles for microbiological criteria, and their own destination-market food law — and write a criterion into the purchase specification. The deliverable is a documented, per-lot result judged against the criterion that applies to your product, not a universal matcha number.
Does organic matcha have fewer microbes?
Not necessarily. Organic certification governs pesticides, fertiliser inputs and processing, not the microbial load a powder acquires from field exposure, handling, moisture and storage. An organic matcha can still carry an elevated yeast/mold or plate count if it was poorly dried or stored. Organic status and a microbiological COA answer different questions; require both if you need both.
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Conclusion
When origin, grade, and export conditions align, matcha becomes a stable revenue source. Start by defining your requirements and confirming quality with a sample.
Looking for wholesale or OEM matcha samples? Contact us — we will recommend the optimal origin and grade based on your application and target markets.
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