Why One with Tea
Shizuoka, Japan
The regional picture is here: which Japanese prefectures actually grow the tea.
Most matcha asks you to take its word for it.
We publish where ours grows, who certifies it, and what we test it for. Organic ceremonial matcha, stone-ground in Shizuoka, Japan, from farms our founder visits himself.
- USDA Organic, audited yearly by QCS
- JAS certified in Japan
- Third-party lab tested
- Single ingredient
- Free US shipping over $50
What the matcha shelf actually looks like
We read every listing in Amazon US's top results for "matcha" and recorded what each one claims. Not an opinion, a count, published in full and updated quarterly.
One with Tea Matcha Market Index, 84 best-selling Amazon US matcha powders, July 14, 2026. See all 84 listings →
How we compare
Same questions, asked of us, of the category, and of the drink most people buy instead.
| One with Tea | Typical shelf matcha | Café latte | |
|---|---|---|---|
| Where it grows | Shizuoka, Japan, named | 18% of listings name no country at all | Rarely disclosed |
| Certification | USDA Organic + JAS, audited yearly | 61% claim organic; claims vary in what backs them | Usually none stated |
| Contaminant testing | Third-party labs, ICP-MS: heavy metals, pesticides, microbes, radiation | Seldom published | Not published |
| "Ceremonial grade" | We name the region and the harvest behind it | 62% claim it; 25% name no region | Grade rarely disclosed |
| Ingredients | One: matcha | Often blended or sweetened | Milk, syrup, sometimes pre-sweetened powder |
| Per cup | About $1.25 | Varies widely | About $6 |
| Who picks the supplier | Our founder, on the farm, in person | A broker, usually unnamed | A distributor |
Category figures are counts from our own Matcha Market Index (84 best-selling Amazon US matcha powders, July 14, 2026). They describe listings, not any one brand.
Why we test, and what for
Matcha is whisked whole, not steeped and thrown away. Whatever the leaf took up from the soil, you drink. Tea plants are hyperaccumulators, so they pull minerals, and contaminants, straight up through their roots.
Our batches go to independent labs and are screened on four fronts: heavy metals (lead, arsenic, cadmium, mercury, by ICP-MS), pesticide residues, microbial contamination and radiation. The principle we started with: no result, no release.
Making it takes 60 seconds
- Measure2g, about half a teaspoon, into a bowl or cup.
- Whisk60 to 70ml of water just off the boil, about 175°F, whisked briskly until frothy.
- FinishDrink as it is, or top with hot or cold milk for a latte.
A small brand, on purpose
The buyer is the founder
One with Tea is run by Christian Mauerer, an importer based in Naples, Florida, who selects every supplier in Japan himself. Not a sourcing agent, not a white label.
He films the farms he buys from, and the footage is on this site, including the photographs on this page.
Questions people ask first
Is "ceremonial grade" a real standard?
No. No authority defines or enforces it, which is why 52 of the 84 best-sellers we counted can use it freely. What does mean something: the growing region, the harvest, the certification, and a test report.
What makes this organic certification different?
Ours is certified on both ends: USDA Organic, audited yearly by Quality Certification Services, and JAS in Japan. A listing that says "organic" without naming a certifier is making a claim, not showing one.
How long does a 60g pouch last?
About 30 cups at 2g each, so roughly a month for a daily drinker. That works out near $1.25 a cup.
30g or 60g?
Start with 30g if you are new to whisking matcha. Choose 60g if you drink it most days; it is the better value per cup.
How should I store it?
Sealed, cold and dark. Matcha fades with light, heat and air. The fridge is fine; just let it come to room temperature before opening so moisture does not condense inside.
Matcha you can check on.
Named region. Two certifications. Lab-screened every batch. About 30 cups in a pouch.
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