Radish Boya, an online grocer who first alerted Shizuoka Prefecture that one of the Shizuoka teas contained radioactive cesium exceeded the provisional limit by its own testing, is going to set its own standard for cesium in food and drinks that it sells, which is one-tenths of the national provisional standards.
From Yomiuri Shinbun (9/5/2011):
Radish Boya, a home delivery service of foodstuff headquartered in Tokyo, announced on September 5 that the company had set its own safety limit for radioactive cesium in food and drinks that it sells.
The company's safety limit for rice, vegetables and fruits, and meat is 50 becquerels/kilogram, and for milk and drinking water 20 becquerels[/liter]. They are both one-tenths of the national provisional safety limits.
The company will conduct sample testing before it purchases the food items from 17 prefectures in Tohoku and Kanto, and will not deliver the items whose cesium content exceeds the company's safety limit. The company has 105,000 registered customers, and there have been over 10,000 inquiries about radiation contamination of food after the Fukushima I Nuclear Power Plant accident.
Things to keep in mind, before you rush to order:
Radish Boya does source from Tohoku and northern Kanto, including Fukushima, Miyagi, and Tochigi, and radioactive cesium has been detected in their testing though not exceeding the provisional safety limit or the company's own limit;
The testing is still a sample testing, though for now there's no practical way to test all;
It does participate in the campaign by the Ministry of Agriculture, Forestry and Fisheries, "Let's help the disaster-affected areas by eating their produce!"
By the way, looking at the Ministry of Agriculture's site, they do seem to feed the government workers there with potentially contaminated vegetables and meat from the disaster-affected areas...