Japan’s Positive List for Tea: A Complete Compliance Guide for Chinese Exporters

If you export tea to Japan, the Positive List is the single most important regulatory barrier between your product and the market. Understanding it in theory is not enough — you need to know which specific tests cause shipment rejections, how to build a compliance system that passes consistently, and what Japanese buyers expect from your documentation.

This guide covers all of it.

What Is Japan’s Positive List System?

Japan’s Positive List system was implemented in May 2006 under the Food Sanitation Act. It replaced the previous “negative list” approach (which only banned specific substances) with a comprehensive system that sets maximum residue limits (MRLs) for virtually all agricultural chemicals.

Key facts:
– 800+ substances have specified MRLs
– 266 specific pesticide screenings apply to tea imports
– Any substance without a specified MRL defaults to a uniform limit of 0.01 ppm — effectively a near-zero tolerance
– This applies to all tea imports regardless of origin country

How it differs from other systems:

Japan’s system is the strictest of the three. Compliance with EU MRLs does not guarantee compliance with Japan’s Positive List — the substances tested and their limits differ significantly.

The 4 Substances That Cause 90% of Tea Rejections

After years of working with Chinese tea suppliers navigating Positive List compliance, a clear pattern has emerged. The vast majority of shipment rejections trace back to four substances:

1. Fipronil — The Silent Killer

• Japan MRL: 0.002 ppm (one of the strictest thresholds in the world)
• Why it fails: Fipronil is used for pest control in rice paddies and other crops. When tea gardens are located near treated fields, cross-contamination occurs through water runoff, wind drift, or soil migration.
• Critical insight: The tea farmer may never have used Fipronil. The contamination comes from neighboring operations. This is why field-level traceability matters more than factory-level certificates.

2. Indoxacarb — The Regulatory Gap

• Japan MRL: Varies by crop, generally very low for tea
• Why it fails: Indoxacarb is approved for use on tea in several major producing countries (including some regions of China) but is heavily restricted in Japan. Suppliers who follow their domestic regulations perfectly can still fail Japan’s Positive List.
• Critical insight: “Legal where we grow it” does not mean “legal where you sell it.” Always check Japan-specific MRLs, not domestic ones.

3. Triazophos — The Legacy Problem

• Japan MRL: Near-zero tolerance
• Why it fails: Triazophos is an organophosphate that was widely used in Chinese agriculture before being restricted. The chemical persists in soil for years — sometimes decades. Tea gardens planted on formerly treated farmland can produce tea that tests positive for Triazophos even though no one has applied it in years.
• Critical insight: Soil history is as important as current farming practices. Ask your supplier: “What was grown on this land before tea?”

4. Endosulfan — The Ghost Chemical

• Japan MRL: Near-zero tolerance
• Why it fails: Endosulfan is banned under the Stockholm Convention (2011). But soil residues persist, particularly in tropical and subtropical regions. Older tea gardens established before the ban may still show trace levels.
• Critical insight: New plantations on previously unused land have dramatically lower Endosulfan risk than converted agricultural fields.

The pattern: Three of four common failures come from soil contamination, not active pesticide application. A supplier can follow every rule perfectly and still fail if their field has legacy contamination.

Step-by-Step Compliance Pathway

Step 1: Field Assessment

Before any production commitment, assess the growing location:

• Soil history: What was previously grown? When was the last conventional (non-organic) crop?
• Neighboring operations: What crops are within 2km? Do they use Fipronil or other restricted substances?
• Water sources: Is irrigation water shared with conventional farms?
• Soil testing: Baseline soil analysis for legacy organophosphates (Triazophos, Endosulfan)

Step 2: Input Management

Establish a controlled input protocol for Japan-bound tea:

• Maintain an approved pesticide list aligned with Japan’s Positive List MRLs (not domestic MRLs)
• Document every application: substance, date, concentration, application method
• Implement buffer zones between tea gardens and conventional crop fields
• Use integrated pest management (IPM) to minimize chemical inputs

Step 3: Pre-Harvest Testing

14 days before harvest, take leaf samples for preliminary screening:

• Test for the “Big 4” (Fipronil, Indoxacarb, Triazophos, Endosulfan) as priority
• If any substance reads above 50% of Japan’s MRL, delay harvest or switch to a different field
• Document results with plot-level GPS coordinates

Step 4: Pre-Shipment Lab Testing

After processing, before shipping:

• Send samples to an accredited laboratory (METI-recognized or ISO 17025 certified)
• Request the full 266-substance tea panel, not a reduced screening
• Require results within 5-7 business days
• Reject any batch that exceeds any single MRL — there is no “close enough”

Step 5: Documentation Package

For each shipment, prepare:

• Certificate of Analysis (COA) with full test results
• Field traceability report (GPS coordinates, harvest date, plot ID)
• Input management log (all substances applied during growing season)
• Processing batch records (factory date, lot number, yield)
• Phytosanitary certificate (from origin country’s plant protection authority)

What Japanese Buyers Actually Check

Japanese procurement teams evaluate tea suppliers through a specific lens. Understanding what they look for helps you prepare:

Lab Report Format

Japanese buyers prefer COAs that:
– List every substance tested (not just pass/fail)
– Show actual detected levels (even when below MRL)
– Include the laboratory’s accreditation number
– Are dated within 30 days of shipment

Traceability Depth

They will ask:
– “Which field was this batch from?” (GPS-level, not just province)
– “What was grown there before tea?”
– “Who is your laboratory?”

If you can answer all three without hesitation, you have passed the trust test.

Voluntary Over-Compliance

The strongest signal you can send to a Japanese buyer: provide documentation they did not ask for. Voluntary sharing of soil test results, field photos, and input logs tells the buyer: “We have nothing to hide.”

Japanese procurement culture rewards this behavior. It is interpreted as long-term commitment — not unnecessary paperwork.

Cost of Compliance vs. Cost of Rejection

The math is clear: compliance costs are a fraction of rejection costs. A $300 lab test protects a $30,000 shipment.

Frequently Asked Questions

What happens if my tea fails Japan’s Positive List?

The shipment is rejected at the port of entry. You bear all costs: return shipping or destruction, storage fees, and administrative penalties. Repeated failures trigger enhanced METI scrutiny of all future shipments from your facility. Your buyer’s trust is damaged — often permanently.

How often does Japan update the Positive List?

The Ministry of Health, Labour and Welfare (MHLW) reviews MRLs annually. Changes are published in the Official Gazette. Major revisions occur every 2-3 years, but individual substance limits can change at any time. Work with a Japan-based compliance partner to monitor updates.

Can I use the same test results for EU and Japan?

Not directly. While some substances overlap, the MRL values differ, and Japan tests for substances the EU does not (and vice versa). You need Japan-specific testing from an accredited lab that covers the full 266-substance tea panel.

What is the difference between MRL and detection limit?

MRL (Maximum Residue Limit) is the legal maximum allowed in the final product. Detection limit is the lowest concentration a laboratory instrument can measure. A substance can be “detected” below the MRL and still be compliant. But in Japan’s near-zero tolerance categories, the detection limit often equals the MRL.

Which Japanese labs can test for Positive List compliance?

METI maintains a list of recognized testing laboratories. Major options include laboratories affiliated with the Japan Food Research Laboratories (JFRL) and various prefectural public health institutes. International labs with ISO 17025 accreditation and Japan Positive List capability are also accepted.

Read more: Global Matcha Shortage: How China’s Tencha Supply is Filling the Gap

Terra Vista Co., Ltd. (テラ・ビスタ株式会社), registered in Japan, helps Chinese tea exporters achieve and maintain Japan Positive List compliance — from field assessment to pre-shipment testing to buyer documentation. With verified supply chains from Guizhou and Zhejiang to Japan, we bridge the compliance gap so your tea reaches the market.

Need help with Positive List compliance? Contact us at ranky@terravista.co.jp

Sources: Japan Food Sanitation Act (Positive List system), METI/MAFF pesticide MRL databases, Japan Ministry of Finance trade data (FY2025: 5,801 tonnes +82%), Terra Vista compliance operations data