Release date: 04/12/2011
Contact Information:  EPA Press Office, press@epa.gov, 202-564-6794
 
As prepared for delivery. 
Good morning, Madam Chairman, Chairman Carper and Members of the  Committee.  I am pleased to be here today to discuss EPA’s role in  monitoring for radiation associated with the Fukushima Daiichi nuclear  power plant emergency in Japan and the possible implications for the  United States.  Let me begin by expressing my sympathy for those who  have lost loved ones from the earthquake and tsunami and my support to  those who are working to control the radiation at the Fukushima Daiichi  plant in Japan. Their efforts are selfless and deserve our recognition. 
EPA Monitoring
As part of its ongoing radiation  monitoring program, EPA regularly monitors and tracks radiation and  radionuclide releases into the environment in the United States.   Monitoring allows us to track known releases and to watch for  contaminants when there is an actual, potential, or unexpected release.   In addition, EPA may bring monitoring equipment to the scene of an  incident to look for localized radiation and to help protect people and  the environment.  
EPA’s nationwide radiation monitoring system, RadNet, contains 124  fixed, or stationary air monitors across the United States (of which,  122 are currently operational), and 40 deployable air monitors that can  be sent to take readings anywhere in the United states or its  territories.  The RadNet network continuously monitors the nation’s  air and regularly monitors drinking water, milk, and precipitation for a  variety of radionuclides (e.g., iodine-131) and radiation types (e.g.,  gross gamma (γ)).  The near-real-time air  monitoring data is continuously reviewed by computer, and if the results  show an unusual increase in radiation levels, EPA laboratory staff is  alerted immediately and further analyzes additional data from the  monitor.  RadNet data provides a means to estimate levels of  radioactivity in the environment, including background radiation as well  as radioactive fallout from past atomic weapons testing, nuclear  accidents, and other large-scale releases of radioactive materials.  RadNet also provides the historical data needed to estimate long-term  trends in environmental radiation levels.   
In the event of a threat of a significant radiation release, EPA  typically will increase the frequency of RadNet sampling and generate  many more data records for a given period of time compared to its  routine operation.  As a result of the events at the Fukushima nuclear  plant in Japan, several EPA monitors have detected very low levels of  radioactive material in the United States consistent with releases from  the damaged nuclear reactors.  In an effort to provide additional  geographic coverage to areas in close proximity to the releases in  Japan, EPA shipped 8 deployable monitors to islands in the Pacific,  including Guam and the Commonwealth of the Northern Mariana Islands, and  the Western United States, including Hawaii, Idaho, and Alaska.  EPA  has also accelerated its monitoring of precipitation, milk, and drinking  water in response to the radiation concerns from the Japanese nuclear  reactors.  While the detections in air, precipitation, and milk were  expected, the levels detected have been far below levels of  public-health concern.  
EPA, along with the Nuclear Regulatory Commission, Department of Energy,  Department of Defense, and the Department of Health and Human Services  (FDA, CDC) are among the many federal agencies taking roles in  monitoring and assessing radiation emissions from the Japanese nuclear  facilities and modeling the potential dose assessments of radiation that  might reach the United States.   As part of the federal government’s  ongoing effort to make our activities and science transparent and  available to the public, EPA will continue to post all RadNet data in  the current on-line database, accessible through the EPA website:   www.epa.gov/japan2011.  In the highly unlikely event that radiation  levels begin to approach levels of concern for public health, the  federal government will coordinate with state and local governments to  ensure that public health and safety precautions are communicated to the  public.
Monitoring Results
EPA’s RadNet radiation air monitors across  the United States have shown typical fluctuations in background  radiation levels.  The levels detected are far below levels of concern.  Results of EPA’s drinking water sampling, precipitation sampling, milk  sampling, and air filter and cartridge analysis have detected very low  levels of radioactive material consistent with releases from the damaged  Japanese nuclear reactors. 
Keep in mind that all of us are exposed to radiation every day, both  from natural sources such as minerals in the ground, and from man-made  sources such as medical x-rays.  Scientists estimate that the average  person in the United States receives a dose of about 310 millirem of  radiation per year from natural background sources.  Over the course of a  lifetime, a person will average an additional ~300 millirem per year  from medical procedures. The amount of radiation that will have an  impact on a person’s health depends on the type of radiation and the  sensitivity of the individual to the radiation exposure.  Differences  such as age, gender and even previous exposure are factors that might  influence a person’s reaction to radiation exposure.  
Air samples obtained through the RadNet system have, to date, contained  very small amounts of iodine, cesium,  and tellurium, which are  consistent with possible releases from the damaged Japanese reactors.   The largest amounts were found in samples from Alaska on March 19 and  24, 2011, but all of the radiation levels detected during the detailed  filter analysis are hundreds of times below levels of concern. 
Drinking water samples taken at various locations throughout the U.S.  during the week of April 4, 2011, ranged from non-detects to trace  amounts of iodine-131 – approximately 1.6 picocuries per liter (piC/L).   (An infant would have to consume over 200 gallons of this water at the  highest detection level to receive a radiation dose equivalent to a  day’s worth of the natural background radiation exposure we experience  continuously from natural sources of radioactivity in our environment.)   Drinking water samples from across the country are currently being  analyzed.  After all data are appropriately reviewed, EPA will release  analysis results and will post the results on our website.  
Early precipitation samples collected by EPA indicated low levels of  radioactivity.  Given the sampling results in other environmental media,  EPA expected to find very low levels of radiation in precipitation  samples. Similar findings are to be expected in the coming weeks as  radioactive materials are dispersed through the air from Japan. While  the levels in some of the rainwater exceed the applicable Maximum Contaminant Level (MCL)  of 3piC/L for drinking water, it is important to note that the  corresponding MCL for iodine-131 was calculated based on long-term  chronic exposures over the course of a lifetime 70 years.  The levels  seen in rainwater are expected to be relatively short in duration and  are not expected to present any threat to public health. 
Results from samples of milk taken March 28, 2011 in Phoenix, Arizona  and Los Angeles, California showed approximately 3 pCi/L of iodine-131,  which is more than 1,500 times lower than the Derived Intervention Level  set by the U.S. Food and Drug Administration. These types of findings  are to be expected in the coming days and are far below levels of public  health concern, including for infants and children.  Iodine-131 has a  very short half-life of approximately eight days, and the level detected  in milk and milk products is, therefore, expected to drop relatively  quickly.  Additional information about the broader federal response can  be found at: http://www.usa.gov/Japan2011.
Conclusion 
Since the events in Japan occurred, EPA’s  website has had thousands of views and we have received many positive  comments from the public on the information we have made available.  The  Agency will continue to provide monitoring results to the public in a  very open and transparent manner.  While we do not expect radiation from  the damaged Japanese reactors to reach the United States at harmful  levels, I want to assure you that EPA will continue our coordination  with our federal partners to monitor the air, milk, precipitation and  drinking water for any changes, and we will continue our outreach to the  public and the elected officials to provide information on our  monitoring results.   
Madam Chairman, Mr. Chairman, thank you for the opportunity to testify.  I welcome any questions you may have.