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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
All Titles
Title 40
Chapter I
Part 425
Subpart I - Subpart I—Retan-Wet Finish-Splits Subcategory
§ 425.90 - Applicability; description of the retan-wet finish-splits subcategory.
§ 425.91 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
§ 425.92 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional pollutant control technology (BCT).
§ 425.93 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
§ 425.94 - New source performance standards (NSPS).
§ 425.95 - Pretreatment standards for existing sources (PSES).
§ 425.96 - Pretreatment standards for new sources (PSNS).
Appendix Appendix A - Appendix A to Part 425—Potassium Ferricyanide Titration Method
Appendix Appendix B - Appendix B to Part 425—Modified Monier-Williams Method
Appendix Appendix C - Appendix C to Part 425—Definition and Procedure for the Determination of the Method Detection Limit 1
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