{"data":{"id":"us/40-cfr-61.204","jurisdiction":"us","citation":"40 CFR 61.204","heading":"Distribution and use of phosphogypsum for outdoor agricultural purposes.","body":"Phosphogypsum may be lawfully removed from a stack and distributed in commerce for use in outdoor agricultural research and development and agricultural field use if each of the following requirements is satisfied:\n(a) The owner or operator of the stack from which the phosphogypsum is removed shall determine annually the average radium-226 concentration at the location in the stack from which the phosphogypsum will be removed, as provided by § 61.207.\n(b) The average radium-226 concentration at the location in the stack from which the phosphogypsum will be removed, as determined pursuant to § 61.207, shall not exceed 10 pCi/g (4500 pCi/lb).\n(c) All phosphogypsum distributed in commerce for use pursuant to this section by the owner or operator of a phosphogypsum stack shall be accompanied by a certification document which conforms to the requirements of § 61.208(a).\n(d) Each distributor, retailer, or reseller who distributes phosphogypsum for use pursuant to this section shall prepare certification documents which conform to the requirements of § 61.208(b).\n(e) Use of phosphogypsum for indoor research and development in a laboratory must comply with § 61.205.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 61—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS","Subpart R—National Emission Standards for Radon Emissions From Phosphogypsum Stacks"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"58e0a235911da532badf04789061e51686652188ca0466b6d96b2026d673018e","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-61.203","next":"us/40-cfr-61.205"},"notice":"GroundRules: Original legal text. Not legal advice."}