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Water Quality Standards

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Water Temperature Standard

Information on EPA's Disapproval Action

On August 8, 2013, EPA disapproved the natural conditions criterion contained in Oregon’s water quality standard for temperature. EPA also disapproved the general natural conditions criterion contained in Oregon’s statewide narrative criteria, which applied to other naturally occurring substances and conditions of water. See the “Questions and Answers” and the EPA action letter below for additional information.

Questions and Answers on EPA Water Quality Standard Actions

EPA letter of action on Oregon Water Quality Standards Actions

Disapproved rule provisions shown in blackout. These provisions are no longer effective for federal Clean Water Act purposes.

Informational report to the Environmental Quality Commission (August 15, 2013)

See the court’s ruling under “Federal Court Opinions and Orders” below.


Oregon's Temperature Standard

Oregon’s current temperature standard was adopted by the Oregon Environmental Quality Commission in December 2003. The Environmental Protection Agency approved much of the standard in March 2004, and approved additional provisions in March 2010. DEQ revised the standard in February 2007 in response to EPA’s disapproval of the 2003 narrative criteria for cool water species, natural lakes and oceans and bays. EPA approved the revised narratives in February 2011.

Information and Guidance Documents

EPA Temperature Guidance

Federal Court Opinions and Orders

Related Documents

[print version]

For more information about DEQ's Water Quality Standards contact Debra Sturdevant by phone at 503-229-6691 or by email.

Oregon Department of Environmental Quality
Headquarters: 700 NE Multnomah Street, Suite 600, Portland, OR 97232
Phone: 503-229-5696 or toll free in Oregon 1-800-452-4011
Oregon Telecommunications Relay Service: 1-800-735-2900  FAX: 503-229-6124

The Oregon Department of Environmental Quality is a regulatory agency authorized to protect Oregon's environment by
the State of Oregon and the Environmental Protection Agency.

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