Regulations last checked for updates: Jan 14, 2026

Title 40 - Protection of Environment last revised: Dec 31, 2026
All TitlesTitle 40Chapter IPart 98Subpart ZAppendix - Table Z-1 to Subpart Z of Part 98—Default Chemical Composition of Phosphate Rock by Origin
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Appendix - Table Z-1 to Subpart Z of Part 98—Default Chemical Composition of Phosphate Rock by Origin
Origin Total carbon
(percent by weight)
Central Florida1.6
North Florida1.76
North Carolina (Calcined)0.76
Idaho (Calcined)0.60
Morocco1.56
authority: 42 U.S.C. 7401-7671q.
source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.
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