Code of Federal Regulations > Title 40 > Chapter I > Part 121 > Subpart A - Subpart A—General

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

§ 121.1 - Definitions.

§ 121.2 - When certification is required.

§ 121.3 - Scope of certification.

§ 121.4 - Pre-filing meeting requests.

§ 121.5 - Request for certification.

§ 121.6 - Reasonable period of time.

§ 121.7 - Certification decisions.

§ 121.8 - Extent of Federal agency review.

§ 121.9 - Failure or refusal to act.

§ 121.10 - Modification to a grant of certification.

§ 121.11 - Requirements for Indian Tribes to administer a water quality certification program.