40 CFR § 414.90
Applicability; description of the subcategory of direct discharge point sources that use end-of-pipe biological treatment
June 9, 2020
The provisions of this subpart are applicable to the process wastewater discharges resulting from the manufacture of the OCPSF products and product groups defined by §414.11 from any point source that uses end-of-pipe biological treatment or installs end-of-pipe biological treatment to comply with BPT effluent limitations.