In cooperation with the Massachusetts Departments of Public Health and Environmental Protection, MWRA has been conducting regular testing of water from Quabbin and Wachusett Reservoirs for potential radioactive contaminants from the damaged Japanese reactors. Tests for radioactive Iodine 131 (I-131) and Cesium-137 (Ce-137) have all been non-detectable.
The Mass Department of Public Health had previously reported that very low concentrations of radioactive Iodine-131 were found in a rainwater sample. According to DPH, the amounts were minute and do not pose any health risk. MWRA will continue to monitor the situation.
For more information, see the Massachusetts Department of Public Health web site.
Related: Testing Shows No Radiation in MWRA Source Waters, March 27, 2011