40 CFR § 121.2 - When certification is required.

---
identifier: "/us/cfr/t40/s121.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 121.2 - When certification is required."
title_number: 40
title_name: "Protection of Environment"
section_number: "121.2"
section_name: "When certification is required."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "D"
subchapter_name: "WATER PROGRAMS"
part_number: "121"
part_name: "STATE CERTIFICATION OF ACTIVITIES REQUIRING A FEDERAL LICENSE OR PERMIT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1251"
regulatory_source: "88 FR 66661, Sept. 27, 2023, unless otherwise noted."
cfr_part: "121"
---


# 121.2 When certification is required.

Certification or waiver is required for any Federal license or permit that authorizes any activity which may result in any discharge from a point source into waters of the United States.