40 CFR § 414.90 - Applicability; description of the subcategory of direct discharge point sources that use end-of-pipe biological treatment.

---
identifier: "/us/cfr/t40/s414.90"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 414.90 - Applicability; description of the subcategory of direct discharge point sources that use end-of-pipe biological treatment."
title_number: 40
title_name: "Protection of Environment"
section_number: "414.90"
section_name: "Applicability; description of the subcategory of direct discharge point sources that use end-of-pipe biological treatment."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "414"
part_name: "ORGANIC CHEMICALS, PLASTICS, AND SYNTHETIC FIBERS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Secs. 301, 304, 306, 307, and 501, Pub. L. 92-500, 86 Stat. 816, Pub. L. 95-217, 91 Stat. 156, Pub. L. 100-4, 101 Stat. 7 (33 U.S.C. 1311, 1314, 1316, 1317, and 1361)."
regulatory_source: "52 FR 42568, Nov. 5, 1987, unless otherwise noted."
cfr_part: "414"
---


# 414.90 Applicability; description of the subcategory of direct discharge point sources that use end-of-pipe biological treatment.

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.