The Partnership’s goal for water quality is to prevent degradation and improve water quality so as to have clean water for all fish, wildlife, and human uses. It will take the combined effort of people living in the whole watershed to keep the water clean.
State of the Watershed: Water Quality
Site has data on current and historic water quality for a variety of locations throughout the Chehalis
This report provides information on a water quality study based on samples taken at 94 sites around the Chehalis Basin.
This is a preliminary assessment based on one year of water quality monitoring.
Total Maximum Daily Load
Chehalis Basin TMDL Update Memo (2021). January, 2021. Provides an update on the status of addressing TMDLs through voluntary actions and related programs in the Chehalis Basin.
Department of Ecology’s Total Maximum Daily Load webpage for the Chehalis Basin. This website describes TMDL plans that cover all of the upper watershed in WRIA 23 and address 303(d) listings for dissolved oxygen (DO), fecal coliform bacteria, and temperature (T) impairments. The site describes current water quality issues, clean-up plans, and actions being taken to fix those problems.
TMDL Implementation Plan (2004): The Chehalis/Grays Harbor Watershed Dissolved Oxygen, Temperature, and Fecal Coliform Bacteria TMDL: Detailed Implementation (Cleanup) Plan.
TMDL Effectiveness Review (2010): Upper Chehalis River Watershed Multi-Parameter Total Maximum Daily Load: Water Quality Data Review (Fecal Coliform)
Other Water Quality Reports
Chehalis Watershed Monitoring Plan
What you can do to help keep water clean in the Chehalis
For landowners: How to get involved in a stream restoration project.