Ammonia; Ammonium Sulfate (solution); Ammonium Nitrate (solution); Water Dissociable Ammonium Salts; Toxic Chemical Release Reporting; Community Right-to-Know

EPA is taking the following four actions in response to a petition to delete ammonium sulfate (solution) from the list of toxic chemicals subject to reporting under section 313 of the Emergency Planning and Community Right-to-Know Act of 1986 (EPCRA): (1) Deleting ammonium sulfate (solution) from the EPCRA section 313 list of toxic chemicals; (2) requiring that threshold and release determinations for aqueous ammonia be limited to 10 percent of the total ammonia present in aqueous ammonia solutions; (3) modifying the ammonia listing by adding a qualifier; and (4) deleting ammonium nitrate (solution) as a separately listed chemical on the EPCRA section 313 list of toxic chemicals. EPA has concluded that the aqueous ammonia present in ammonium sulfate (solution) is more appropriately reported under the EPCRA section 313 ammonia listing, and that reporting 10 percent total aqueous ammonia under the ammonia listing is appropriate and provides sufficient information for the public to assess the impacts of releases of aqueous ammonia. EPA has also concluded that releases of ammonium nitrate (solution) are more appropriately reported under the EPCRA section 313 listings for ammonia and the water dissociable nitrate compounds category.