This webinar will demonstrate EPA’s Ecotoxicology Knowledgebase (ECOTOX) tool, which gives quick access to reliable and up-to-date information about how chemicals potentially affect ecologically relevant species. ECOTOX is a comprehensive, publicly available knowledgebase providing single chemical environmental toxicity data for over 12,000 chemicals and species, including aquatic life, terrestrial plants, and wildlife. ECOTOX provides robust curated toxicity data for aquatic and terrestrial organisms to support ecological risk assessments, site assessments, criteria/benchmark development, and other research. The knowledgebase is additionally used to aid the prioritization and assessment of chemicals. By leveraging this knowledge, EPA remains committed to providing clear, actionable, and accessible information about PFAS to the public, researchers, and risk assessors. This presentation will include information on updates to ECOTOX data for PFAS to support hazard evaluation and development of ecological risk assessment screening values. The ECOTOX Knowledgebase Resource Hub can be accessed here.