On June 6, EPA released a draft Protective Action Guide (PAG) and planning guidance for radiological incidents. This PAG is intended to guide water systems in protecting against short-term health risks during response to radiological incidents. It explains how to calculate Derived Response Levels (DRLs) for radionuclides likely to appear in drinking water following a radiological contamination incident. DRLs are concentrations of radionuclides in drinking water that correspond to EPA’s proposed PAG of 100 mrem and 500 mrem. It does not replace the radionuclide MCLs designed to protect public health over the long term. EPA has stated that a Federal Register notice and opportunity for comment on this draft should be published soon. EPA.