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The Clean Water Act requires the EPA to prepare a schedule identifying dispersants, other chemicals, and other spill mitigating devices and substances, if any, that may be used in carrying out the National Contingency Plan (NCP); and the waters and quantities in which they may be used. The EPA is considering revising subpart J of the NCP to address the efficacy, toxicity, and environmental monitoring of dispersants, other chemical and biological agents, and other spill mitigating substances, as well as public, state, local, and federal officials concerns on their authorization and use. Specifically, the agency is considering revisions to the technical product requirements under subpart J, including amendments to the effectiveness and toxicity testing protocols, and establishing new effectiveness and toxicity thresholds for listing certain products on the Schedule. Additionally, the agency is considering amendments to area planning requirements for agent use authorization and advanced monitoring techniques. The agency is also considering revisions to harmonize 40 CFR part 110.4 with the definitions for chemical and biological agents proposed for subpart J. These changes, if finalized, will help ensure that chemical and biological agents have met rigorous efficacy and toxicity requirements, that product manufacturers provide important use and safety information, and that the planning and response community is equipped with the proper information to authorize and use the products in a judicious and effective manner.