background. there's radiation all around us at all times. so a day of just living normally. that's the amount of radiation you would get, in 7,000 liters. i mean, in other words, the amount of water you drink, you're getting way, way less than just living every day. >> so how does it make its way from japan into the u.s. drinking water? >> it went through the windstream from japan to the united states. and then what happens is that radiation is in particles. and those particles get into clouds -- radioactive dust gets into the -- gets into the rain cloud. and then that rain is going to have radiation in them. >> and this really isn't a surprise, right? the epa has been expecting this to happen? >> we could probably talk every single day, several times a day, and -- >> i feel like we do. >> and i could say to you, randi, now it's in this water system, in that water system. >> milk -- we're looking at everything. >> exactly. it's going to be in all of those things, because the radiation from japan reached the united states. it reached the west coast, and then it reached the east coast. so sort of by definition, it's going to be in things like water and milk. the key here is the dose.