I've been eating about 10 pounds of uncooked rice a week. I have it almost all 3 meals a day.
But I've been buying it from an Asian store recently, and I believe it's from China. So I researched (i.e. I spent two minutes on Google) and found this article from 2010 detailing the relative safety of rice from different countries.
http://www.foodsmatter.com/allergy_intolerance/cow_milk_all_management/articles/rice_arsenic_1_03.10.html"Which Rice is Best?
Professor Andrew Meharg from Aberdeen University has worked with the FSA on this issue. He is quoted as saying: “Between different growing regions/countries, total As [Arsenic] content can vary by fivefold, with Himalayan (N. India, N. Pakistan, and Nepal) rice being the lowest and US, EU and As-groundwater impacted Bangladesh rice being the highest.”
Despite such a high-rice diet in China, the Chinese population has a surprisingly low intake of arsenic because they have the best arsenic controls for rice of any country. This rather suggests rice from China would be a safer bet for us too.
Another Professor Meharg study suggests that rice from the US, France, Italy and Bangladesh had the highest levels of inorganic arsenic tested, with about 30 per cent of American long grain rice samples found to contain levels above the Chinese strict standards. He suggested that rice from India and Egypt had the lowest levels, with basmati rice the best type."