40 CFR § 125.56 - Scope and purpose.

---
identifier: "/us/cfr/t40/s125.56"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 125.56 - Scope and purpose."
title_number: 40
title_name: "Protection of Environment"
section_number: "125.56"
section_name: "Scope and purpose."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "D"
subchapter_name: "WATER PROGRAMS"
part_number: "125"
part_name: "CRITERIA AND STANDARDS FOR THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "The Clean Water Act, 33 U.S.C. 1251  unless otherwise noted."
regulatory_source: "44 FR 32948, June 7, 1979, unless otherwise noted."
cfr_part: "125"
---


# 125.56 Scope and purpose.

This subpart establishes the criteria to be applied by EPA in acting on section 301(h) requests for modifications to the secondary treatment requirements. It also establishes special permit conditions which must be included in any permit incorporating a section 301(h) modification of the secondary treatment requirements (“section 301(h) modified permit”).