This table from Consumer Reports indicates that there is plenty of arsenic, organic and inorganic, in many brands of rice. Rice grown outside of the U.S. might be slightly lower in arsenic. The problem is that before rice was grown, those fields in the South used to be for growing cotton. Cotton pesticides contained arsenic that permeated into the soil.
The way rice pasta is cooked should substantially reduce the arsenic content of the rice. But Consumer Reports advises that children should not consume rice milk on a daily basis.
www.consumerreports.org/cro/magazine/2012/11/arsenic-in-your-food/index.htm#chartThe study noted that more than 10 percent of the rice in China, Pakistan, and Bangladesh is estimated to have arsenic concentrations exceeding 200 ppb, while in the U.S., more than 50 percent of the rice is estimated to contain arsenic at those elevated levels.