Water Quality

view of a lake 
In September 2019, Oregon DEQ released its draft 2018/2020 Integrated Report, and is soliciting comments through Jan. 6, 2019. The federal Clean Water Act requires Oregon to report on the quality of its surface waters every two years. Although not a written report, the Integrated Report is a reporting of the status of water quality in Oregon and a list of waters considered to be impaired.
The Integrated Report can be accessed in four ways:
Raw data used in Oregon’s 2018/2020 Draft Integrated Report can also be accessed through DEQ’s Ambient Water Quality Monitoring Portal:

Additional resources

Oregon's Draft 2018/2020 Integrated Report Public Information

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The federal Clean Water Act requires DEQ to assess Oregon’s water quality and prepare a report every two years. The Integrated Report is a database report that combines reporting information for the Clean Water Act Section 305(b) assessment of all water bodies and the Section 303(d) list of water bodies that do not meet water quality standards. The 303(d) list represents where pollution reduction plans called Total Maximum Daily Loads are needed.
The 2018/2020 Integrated Report represents the state’s most comprehensive evaluation of water quality data and information about Oregon’s waters. DEQ assessed this data and information to determine whether Oregon’s waters contain pollutants at levels that exceed protective water quality standards and do not support their beneficial uses. To complete this assessment, DEQ reviewed and assessed readily available data and information for the time period January 1, 2008 through December 31, 2017 using the Methodology for Oregon’s 2018 Water Quality Report and List of Water Quality Limited Waters.
The Integrated Report categorizes all assessed waterbodies. DEQ evaluated data on whether Oregon’s waters are of a high enough quality to meet the most common beneficial uses, such as supporting aquatic life, providing drinking water or supporting recreation. Waterbodies that exceed protective water quality standards are identified as impaired, (which is also referred to as the “303(d) List”). Identifying a waterbody as impaired initiates the prioritization and development of a Total Maximum Daily Load (TMDL).
The categories are as follows:
  • Category 1: All beneficial uses are supported and none are known to be impaired. Oregon does not have suffciently robust data to be able to use this Category.
  • Category 2: At least one core beneficial use is supported and none are known to be impaired.
  • Category 3: Not enough information to determine beneficial use support.
  • Category 4: Available data and/or information indicate that at least one designated use is not being supported but a TMDL is not needed.
  • Category 5: At least one beneficial use is not supported and a TMDL is needed.


The public comment period for the draft methodology closed on June 28, 2018. 
The call for data closed on July 25, 2018.  In all, Oregon DEQ evaluated over 6.5 million data points from 74 organizations for the draft Integrated Report.

​Public involvement

DEQ is accepting comments on draft assessment results and report conclusions as well as suggestions for how it can improve its visualization tools.

We have extended the deadline for submitting public comments to 5 p.m., Jan. 6, 2020. 

Submit comments  by email or by U.S. mail to:
DEQ Water Quality Assessment
Water Quality Division
700 NE Multnomah
Portland, OR 97232-4100

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For more information on
the Integrated Report please contact:
Becky Anthony, 503-378-5319