River & stream water quality monitoring
Coronavirus (COVID-19) status update
Due to the Covid-19 pandemic, river and stream water quality fieldwork is suspended until further notice.
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.
Data & reports