Data / Federal rules / 2024-29483

Water Quality Standards; Establishment of a Numeric Criterion for Selenium for the State of California

The Environmental Protection Agency published this final rule in the Federal Register on December 17, 2024. It took effect on January 16, 2025.

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What the agency says

The Environmental Protection Agency (the EPA or the Agency) is amending a Federal Clean Water Act (CWA) rule, the California Toxics Rule, to promulgate a final, revised statewide chronic freshwater selenium water quality criterion applicable to certain California waters to protect aquatic life and aquatic-dependent wildlife from exposure to toxic levels of selenium. This revised criterion builds upon the science underlying the EPA's current national CWA section 304(a) recommended aquatic life freshwater criterion for selenium.

Key facts

Document number: 2024-29483
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: December 17, 2024
Takes effect: January 16, 2025
Dates: This rule is effective on January 16, 2025. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register as of January 16, 2025.
Docket: EPA-HQ-OW-2018-0056; FRL 6322-03-OW
Regulation ID (RIN): 2040-AF79
Code of Federal Regulations: 40 CFR 131
Topics: Environmental protection; Incorporation by reference; Indians-lands; Intergovernmental relations; Reporting and recordkeeping requirements; Water pollution control
Pages: 25

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on environmental protection · Rules on incorporation by reference · Rules on indians-lands · Published in December 2024

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.