- [See Water Quality Standards ]
(Effective March 3, 2011) State regulation establishing water quality standards for surface waters of the state.
- Withdrawal of the Federal Water Quality Standards Use Designations for Certain Water Bodies in Idaho (November 5, 2008)
- Docket at Regulations.gov (Docket #: EPA-HQ-OW-2008-0495)
- Withdrawal of the Federal Designated Use for Shields Gulch in Idaho (March 13, 2002)
- Withdrawal of Certain Federal Human Health and Aquatic Life Water Quality Criteria Applicable to Rhode Island, Vermont, the District of Columbia, Kansas and Idaho (April 12, 2000)
- Establishment of Numeric Criteria for Priority Toxic Pollutants; States' Compliance—Revision of Polychlorinated Biphenyls (PCBs) Criteria (November 9, 1999)
- Final Rule - Water Quality Standards for Idaho (July 31, 1997)
- National Toxics Rule (Preamble) (December 22, 1992)
Recent actions along with supporting documents are provided below for reference.
December 13, 2016 - Idaho submitted its final rule package to EPA for approval of updated human health criteria.
July 23, 2013 - EPA disapproved Idaho's antidegradation de minimis exemption.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- Water Quality Standards (PDF)(180 pp, 1 MB)