Data / Federal rules / 2025-18816

Water Quality Standards To Protect Aquatic Life in the Delaware River

The Environmental Protection Agency published this final rule in the Federal Register on September 29, 2025. It took effect on November 28, 2025.

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What the agency says

The U.S. Environmental Protection Agency (EPA) is finalizing revised water quality standards (WQS) largely as proposed for certain water quality management zones of the mainstem Delaware River under the Clean Water Act (CWA). Specifically, the EPA is promulgating a designated use of protection and propagation of resident and migratory aquatic life and corresponding dissolved oxygen water quality criteria for the mainstem Delaware River in Zone 3, Zone 4, and the upper portion of Zone 5 (in total, river miles 108.4 to 70.0).

Key facts

Document number: 2025-18816
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: September 29, 2025
Takes effect: November 28, 2025
Dates: This final rule is effective on November 28, 2025.
Docket: EPA-HQ-OW-2023-0222; FRL 10760-02-OW
Regulation ID (RIN): 2040-AG30
Code of Federal Regulations: 40 CFR 131
Topics: Environmental protection; Indians-lands; Intergovernmental relations; Reporting and recordkeeping requirements; Water pollution control
Significant: Yes, under Executive Order 12866
Pages: 27

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on environmental protection · Rules on indians-lands · Rules on intergovernmental relations · Published in September 2025

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.