You are here: EPA Home Japanese Nuclear Emergency: Radiation Monitoring Updates on EPA's Monitoring Effort Daily Data Summary Due to the consistent decrease in radiation levels across the country associated with the Japanese nuclear incident, EPA will update the daily data summary page only when new data are posted. Historical daily data summaries will continue to be accessible from this webpage. After a thorough data review showing declining radiation levels related to the Japanese nuclear incident, EPA has returned to the routine RadNet sampling and analysis process for precipitation, drinking water and milk. As always, EPA's RadNet system of more than 100 stationary monitors will continue to provide EPA scientists near-real-time data on the slightest fluctuations in background radiation levels. Due to the consistently decreasing radiation levels, EPA is evaluating the n...