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Water Quality Standards
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Guidance Documents
Internal Management Directives
Letters and Memos
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Internal DEQ Memo Regarding Application of Dissolved Oxygen Criteria
- June 8, 2010 PDF
Updates DEQ's application of the DO criteria to the "salmon and trout rearing and migration" beneficial use and the "redband or lahontan cutthroat trout" beneficial use for Clean Water Act Purposes, including the NPDES permit program, the TMDL program and the assessment program. - Internal DEQ Memo Regarding Iron and Manganese Criteria - November 4, 2008 PDF
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Clarification Letter from DEQ to EPA - February 4, 2004 PDF
Provides clarification on Oregon's natural conditions provision and the application of dissolved oxygen criteria for spawnng. - DEQ
letter to EPA - December 19, 2003 PDF
Regarding antidegradation, natural conditions, and temperature standards. - DEQ
Letter to EPA - June 22, 1998 PDF
Regarding benefical uses, temperature, dissolved oxygen, and pH standards.
For more information about DEQ's Water Quality Standards contact Debra Sturdevant by phone at (503) 229-6691 or by e-mail.
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