What JAS is
JAS stands for Japanese Agricultural Standard.
It is run by MAFF, the ministry that covers agriculture.
The scheme dates from 1950, and it has been revised repeatedly since.
It covers grading, labelling and organic certification.
It is not one document, and tea is a small part of what it covers.
For tea, the grading part is largely voluntary.
The organic part is not, because organic claims are legally controlled.
Organic labelling became a legal requirement in 2001.
That split is what to understand before reading any label.
A tea can be sold without any JAS grade at all.
It cannot be sold as organic without JAS certification.
Certification is done by registered bodies rather than by the ministry.
The ministry accredits those certifiers and audits them.
That structure is common, but it means the certificate belongs to someone.
Find out who that someone is before trusting the mark.
The ministry also publishes grading criteria for individual products.
For tea the criteria cover appearance, liquor and infused leaf.
Grading and labelling
Japanese tea is graded by leaf, by harvest and by region.
There is no single national grade stamp covering all of it.
Sencha（煎茶）is the default: steamed and rolled into needle shapes.
Steaming runs from 30 seconds to about 2 minutes, depending on the style.
Longer steaming gives a greener liquor and more broken leaf.
Gyokuro（玉露）is shade-grown, and the shading changes the chemistry.
It runs 20 to 30 days, raising theanine while lowering catechins.
Matcha（抹茶）is shaded leaf, dried and stone-ground.
Its grade depends on the leaf used and on how finely it is ground.
Bancha（番茶）is the later, coarser harvest, and it costs less.
Hojicha（ほうじ茶）is roasted, which cuts the caffeine considerably.
Genmaicha（玄米茶）mixes leaf with toasted rice.
Roasting and blending both sit outside any grade scheme.
Yabukita accounts for roughly 70 per cent of Japanese plantings.
A label naming the cultivar tells you more than a grade name does.
Grading panels are trained, but the judgement stays sensory.
Two panels can disagree, and the scheme allows for that.
Organic certification
Organic is the part of JAS that carries legal force.
Only certified operators may use the term on a label.
Certification covers the field, the processing and the paperwork.
A farm must work the land without prohibited inputs first.
Tea is a perennial crop, so the conversion period runs 3 years.
Records are inspected annually, and they are checked rather than accepted.
Imported organic tea needs JAS certification as well.
An organic certificate from another country is not enough on its own.
Equivalence agreements exist, and they cover a few countries.
Where they apply the paperwork is shorter, but it is still required.
The JAS organic mark has a fixed form, and it can be checked.
A label borrowing the words without the mark is not certified.
Retailers sometimes use ‘reduced pesticide’ instead, which means far less.
That claim has its own rules and a much lower bar to clear.
Read which of the two you are actually being offered.
Conversion records are the part that catches most applicants out.
A field that misses a season of records can lose certification entirely.
Safety limits and origin marks
Pesticide limits run on what is called the positive list system.
It sets a default maximum for everything not individually listed.
That default is 0.01 ppm, which is strict by any measure.
It catches residues that other systems simply do not look for.
Tea is a crop that draws particular scrutiny under it.
Consignments are tested at import, and rejections are routine.
Producers who export to Japan plan their sprays around the list.
Geographical indications are a separate scheme again.
Japan protects regional food names, and tea is among them.
Registration ties a name to a place and to a method.
It does not guarantee flavour, and it is not a quality grade.
A GI name on a packet is a claim about origin, and nothing more.
The certifier’s name should also appear somewhere on the label.
A packet that omits it is worth querying before you buy.
The system is thorough and unusually heavy on paper.
That is a fair trade for how little it leaves to interpretation.
Paperwork is cheaper to argue about than flavour.
Buyers who skip it end up arguing about taste instead.