CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart R CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart R – Phosphate Rock Subcategory Current as of: 2024 | Check for updates | Other versions § 436.180 Applicability; description of the phosphate rock subcategory § 436.181 Specialized definitions § 436.182 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available § 436.185 Standards of performance for new sources