CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart N CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart N – Potash Subcategory Current as of: 2024 | Check for updates | Other versions § 436.140 Applicability; description of the potash subcategory § 436.141 Specialized definitions § 436.142 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available