In short: Aiya Co., Ltd. is a green tea producer in Nisho, Japan, operating at 11 metres elevation and certified by the Ethical Tea Partnership.
Aiya Co., Ltd. is a green tea operation based in Nisho, Japan, located at approximately 11 metres above sea level. The estate is operated by Aiya Co., Ltd. itself, and no direct supply relationships to downstream buyers are currently recorded in public trade data.
Terroir & Climate
At just 11 metres elevation, this estate sits in Japan's lowland tea-growing zone, where the maritime climate of the Nisho region typically moderates temperature extremes. Estates at this altitude in central Japan generally experience a longer growing season and warmer conditions than their highland counterparts, which can encourage faster vegetative growth and earlier spring flush development.
Low-elevation sites in this latitude band tend to receive ample moisture from Pacific weather systems, and the relatively flat terrain often allows for mechanised cultivation and processing. While high-altitude Japanese estates are prized for slower leaf maturation, lowland operations such as this typically focus on volume production and cultivars suited to the region's temperate, humid conditions.
Tea Produced
As a dedicated green tea producer, Aiya Co., Ltd. works within Japan's diverse tradition of steamed and pan-fired styles. Lowland estates in central Japan commonly produce sencha and other mainstream greens; at this elevation, leaf character tends toward brisk vegetal notes rather than the more delicate, umami-rich profiles associated with shaded or high-altitude cultivation. The warmer growing conditions typical of the altitude often yield teas with robust body and pronounced grassy or marine qualities in the cup.
Operator
The estate is operated by Aiya Co., Ltd., which functions as both grower and proprietor. No other estates operated by the same company are currently recorded in the directory, suggesting a focused, single-site operation or a business model that integrates estate production with processing and distribution under one corporate structure.
Certifications & Ethics
Aiya Co., Ltd. holds certification from the Ethical Tea Partnership, a multi-stakeholder initiative that requires members to meet standards on labour rights, health and safety, and environmental stewardship. For buyers, ETP certification offers independent assurance that the estate is monitored against a common code of practice; for workers, it typically means access to grievance mechanisms and regular third-party audits of working conditions.
Location & Neighbouring Estates
Aiya Co., Ltd. lies at 34.8853, 137.1223 in Nisho, Japan. Its 11 m elevation is the 10th highest of 11 estates we map in Japan. The nearest estates in the TeaTrade directory, measured point-to-point from these coordinates, are:
- Sasaki Green Tea Company — 86 km away · 350 Kamiuchida Kakegawa City
- Kobayashi Aracha Factory — 87 km away · Kikugawa
- Marumatsu Tea Co., Ltd. — 87 km away · Shizuoka
- Shogyoken Seicha Co Ltd — 122 km away · 54 Kusauchi Miyanogo Kyotanabeshi
- Yame Tea Kumaen — 240 km away · Tokyo
Observed Climate at Aiya Co., Ltd. (2025)
ERA5 reanalysis data modelled for Aiya Co., Ltd.’s coordinates recorded 1,592 mm of precipitation across calendar year 2025. The wettest month was May (245 mm) and the driest was February (22 mm). Daytime highs averaged 20.7 °C and overnight lows 12.8 °C over the year; August was the warmest month and February the coolest.
| Metric | 2025 value |
|---|---|
| Annual precipitation | 1,592 mm |
| Wettest month | May (245 mm) |
| Driest month | February (22 mm) |
| Mean daily high | 20.7 °C |
| Mean overnight low | 12.8 °C |
Frequently Asked Questions
Where is Aiya Co., Ltd. located?
Aiya Co., Ltd. is in Nisho, Japan, at coordinates 34.8853, 137.1223, at an elevation of about 11 metres.
Who operates Aiya Co., Ltd.?
Aiya Co., Ltd. is operated by Aiya Co., Ltd., according to public supply-chain records.
What type of tea does Aiya Co., Ltd. produce?
Aiya Co., Ltd. is recorded as producing green tea.
What certifications does Aiya Co., Ltd. hold?
Aiya Co., Ltd. is recorded as holding the following certification(s): Ethical Tea Partnership.
How much rain does Aiya Co., Ltd. receive?
ERA5 reanalysis data for the estate's coordinates recorded 1,592 mm of precipitation in 2025, peaking in May (245 mm).
Data sources: public supply-chain disclosures (Ethical Tea Partnership member lists, Rainforest Alliance certificate holders and retailer supplier disclosures); climate figures are ERA5 reanalysis modelled for the estate’s coordinates via Open-Meteo (calendar year 2025); coordinates and elevations from geocoded records. Spotted an error? Email [email protected].
