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State Library of Oregon: Federal Documents
This archived document is maintained by the State Library of Oregon. It is for informational purposes and may not be suitable for legal purposes.
EPA approval letter The EPA's review of portions of Oregon's March 2001 antidegradation policy implementation internal management directive for NPDES permits and section 401 water quality certifications
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EPA approval letter The EPA's review of portions of Oregon's March 2001 antidegradation policy implementation internal management directive for NPDES permits and section 401 water quality certifications (2013). State Library of Oregon Digital Collections, accessed 12/12/2025, https://digitalcollections.library.oregon.gov/nodes/view/276070