# Water Quality Standards; Establishment of a Numeric Criterion for Selenium for the State of California
> **Rule** · Final rule. · Published 2024-12-17 · Effective 2025-01-16 · 89 FR 101914
## Document
- **Document number:** 2024-29483
- **Category:** water-quality
- **Federal Register citation:** 89 FR 101914
- **CFR reference:** 40 CFR 131
- **Publication date:** 2024-12-17
- **Effective date:** 2025-01-16
- **State:** CA
- **EPA docket:** EPA-HQ-OW-2018-0056
## Abstract

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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/12/17/2024-29483/water-quality-standards-establishment-of-a-numeric-criterion-for-selenium-for-the-state-of)
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