Since the 1990s, USEPA has provided risk-based Regional Screening Levels (RSLs) to assist in evaluating environmental monitoring and contaminant levels – e.g., in soil, air, and water at residential and industrial properties. EPA periodically updates the RSL tables to reflect new contaminants of concern and new chemical toxicity data. The May 2022 RSL tables have been expanded to include 14 per- and polyfluoroalkyl substances (PFAS). PFAS are a large family of emerging contaminants that are garnering significant interest due to their significant toxicity and widespread use in industrial and consumer products such as fire-fighting foam, fabric treatment, and some food packaging. The latest EPA RSL tables are available at: https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables
Additional info regarding ongoing efforts to address and treat PFAS are available by searching this website: https://www.scsengineers.com/ and then using the filter to narrow down returns to your interests.