After weeks of 'no detection', radionuclides suddenly pop up in San Luis Obispo Milk

The date of collection was on May 2nd, and there is a lag time in getting results back to the public due to testing.  Levels are low, and the California Dept. of Public Health does a good job of concisely explaining the potential absorbed doses in their report.

Source: CDPH

For your future reference, here's an EPA chart that converts isotope concentrations in water to absorbed dose.