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Water Quality Improvement Projects (TMDLs)

Columbia River projects

The following table lists overview information for water quality improvement projects (including total maximum daily loads, or TMDLs) for the Columbia River. Please use links (where available) for more information on a project.

To get additional information about the water bodies in the Columbia River system please use the Water Quality Assessment Query Tool.

Map for WRIAs in the Columbia River system.

Water Quality Stories in the Columbia River system:

Waterbody Name Pollutant(s) Status TMDL Lead(s)
Columbia River


Snake River, Lower

Dioxin TMDL Issued by U.S. EPA Dustin Bilhimer
Columbia River


Columbia River, Lower
Columbia River, Middle


Snake River

Total Dissolved Gas Approved Chad Brown
Columbia and Snake River Mainstem (EPA web site) Temperature "Delayed to allow necessary discussions and information exchange." (per EPA web site) Marylou Soscia - EPA

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Last updated August 2016