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Water Quality

Water Quality Assessment

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305(b) Reports
Integrated Reports and 303(d) Lists:
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Water Quality Assessment

Every two years, DEQ is required to assess water quality and report to the U.S. Environmental Protection Agency on the condition of Oregon's waters. DEQ prepares an Integrated Report that meets the requirements of the federal Clean Water Act for Sections 305(b) and 303(d).

  • CWA Section 305(b) requires a report on the overall condition of Oregon's waters.
  • CWA Section 303(d) requires identifying waters that do not meet water quality standards and where a Total Maximum Daily Load pollutant load limit needs to be developed.

The Integrated Report includes an assessment of each water body where data are available, and the list of waters identified under Section 303(d) as water quality limited and needing a TMDL.

Waters may be added to the 303(d) list based on evaluation of new data, application of new or revised water quality standards, or information showing water quality has declined.

Waters may be removed from the 303(d) list when TMDLs or other control measures have been established that are expected to improve water quality, when data show water quality has improved, and in some cases when water quality standards are revised.

Oregon's 2010 Integrated Report and 303(d) List - Effective

Oregon’s 2010 303(d) list was finalized in December 2012 and is the currently effective 303(d) list. (See links to Oregon’s 2010 Integrated Report and 2010 Assessment Database and 303(d) list below.)

DEQ submitted Oregon’s 2010 Integrated Report and 303(d) list to EPA in May 2011. EPA approved the submitted 303(d) listings and de-listings on March 15, 2012. EPA also disapproved DEQ’s submittal for not including other waters and proposed adding other waters to Oregon’s 303(d) list. On Dec. 14, 2012, after a public review process, EPA took final action to add 870 listings to the 2010 303(d) list. The 2010 303(d) list is effective for Clean Water Act purposes.

Oregon's 2012 Integrated Report and 303(d) List - Submitted

DEQ submitted Oregon's 2012 Integrated Report and 303(d) list to EPA in November 2014. (See links to Oregon’s 2012 Integrated Report and 2012 Assessment Database and 303(d) list below.)

EPA will review and either approve or disapprove the 2012 303(d) list as submitted. After EPA has taken final action, the 2012 303(d) list will become effective for Clean Water Act purposes.

Assessment Topics Assessment Databases and GIS Information

*A TMDL (Total Maximum Daily Load) is the calculated amount of pollutant a water body can receive and still meet Oregon water quality standards.

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For more information about DEQ's Integrated Report and 303(d) list contact Karla Urbanowicz by phone at (503) 229-6099 or by e-mail.

Oregon Department of Environmental Quality
Headquarters: 811 SW Sixth Ave., Portland, OR 97204-1390
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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