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).
Section 305(b) requires a report on the overall condition of
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
Oregon DEQ reports to the EPA the status of our waters, and those waters which belong on the 303(d) list. The EPA displays this data for the nation on How’s My Waterway.
Approved Integrated Report