Contamination of the marine environment around Fukushima NPPs has occurred through fallout and discharge of contaminated water into the sea. Japanese institutes have been monitoring seawater about 330 meters east of the discharge point and along a 30 km offshore transect. Data from several days show heterogeneous distribution of radionuclides as expected. Concentrations of Cs-137 and I-131 in surface waters 30 km offshore were 3 to 4 orders of magnitude higher than 2005 levels, and up to 3 orders of magnitude higher 330 meters from Fukushima. Modeling shows initial northeast transport of contaminated seawater reaching the 30 km section within 7 to 14 days, while marine dispersion to other Pacific countries will take months or years.