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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 40
Chapter I
Part 437
Subpart D - Subpart D—Multiple Wastestreams
§ 437.40 - Applicability.
§ 437.41 - Special definitions.
§ 437.42 - Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).
§ 437.43 - Effluent limitations attainable by the application of the best conventional pollutant control technology (BCT).
§ 437.44 - Effluent limitations attainable by the application of the best available technology economically achievable (BAT).
§ 437.45 - New source performance standards (NSPS).
§ 437.46 - Pretreatment standards for existing sources (PSES).
§ 437.47 - Pretreatment standards for new sources (PSNS).
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