U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 40Chapter IPart 439Subpart E - Subpart E—Research
§ 439.50 - Applicability.
§ 439.51 - Special definitions.
§ 439.52 - Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).
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