Milk- looking at historical EPA data

Since the EPA is not providing their tests on milk, would it be safe to assume that the highest levels would occur in a simliar timeline to Chernobyl. It appears Cesium reached its' peak two to three months after Chernobyl in Region 7. Also, would it be save to guess that based on the high levels of 131 in precipitation in Boise and Kansas City (the three highest) that cesium should be peaking in June 2011?