To address issues raised by various parties during 2010 Deepwater Horizon Oil Spill, U.S. EPA proposes amending requirements under National Oil and Hazardous Substances Pollution Contingency Plan (NCP). Proposed Subpart J revisions deal with product toxicity and efficacy test methodologies, toxicity and efficacy criteria, human health and safety information requirements, area planning requirements for chemical and biological agent use authorization, and dispersant monitoring requirements.