We monitor water quality at nearly 100 river and stream stations throughout the state to understand the health of waterways. Our science offers residents and policymakers credible data to make informed choices for rivers and streams in Washington. All of our data are available to download.
Each water year, from Oct. 1 through Sept. 30 of the following year, our freshwater scientists create a water quality annual report, summarizing that year's data.
Markus Von Prause
Scientist, Ambient Water Quality Lead