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Water Quality Improvement Projects (TMDLs)

WRIA 23: Upper Chehalis

The following table lists overview information and links to specific water quality improvement projects (including total maximum daily loads, or TMDLs) for this water resource inventory area (WRIA). Please use links (where available) for more information on a project.

For general information about water quality improvement projects in the Chehalis River Basin please visit


Waterbody Name Pollutant(s) Status** TMDL Lead
Chehalis River Basin Upper Chehalis River Watershed
  • Ammonia-N
  • BOD (5-day)
  • Dissolved Oxygen
  • Fecal Coliform
  • Temperature

Approved by EPA

Brett Raunig

** Status will be listed as one of the following: Approved by EPA, Under Development or Implementation

For more information about WRIA 23:

* The Department of Ecology and other state resource agencies frequently use a system of 62 "Water Resource Inventory Areas" or "WRIAs" to refer to the state's major watershed basins.


Last updated October 2016