Japanese Nuclear Emergency: Radiation Monitoring
RadNet Data for Welch, Minnesota
This site contains information and data from March 11, 2011 to June 30, 2011. EPA has returned to routine RadNet operations. This site will continue to be available for historical and informative purposes.
In the tables below we provide sampling results for:
Elevated levels of radioactive material in rainwater have been expected as a result of the Japanese nuclear incident. Since radiation is known to travel in the atmosphere - precipitation data collected in several states have shown elevated levels of radiation in recent precipitation events. In all cases, these are levels above the normal background levels historically reported in these areas. While short-term elevations such as these do not raise public health concerns and the levels seen in rainwater were expected to be relatively short in duration-U.S. EPA took steps to increase the level of monitoring of precipitation, drinking water, and other potential exposure routes to continue to verify that. After a thorough data review showing declining radiation levels in these samples, EPA has returned to the routine RadNet sampling and analysis process for precipitation, drinking water and milk.
Drinking water samples collected by EPA since the Japanese nuclear incident have shown radioactive material at levels well below public-health concern. Similar findings are to be expected in the coming weeks.
About drinking water laboratory data