River & stream water quality monitoring

gold-shield alert icon

Coronavirus (COVID-19) status update

Only selected river and stream water quality sites are being monitored at this time.

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


Video: Ecology in Focus: Bill Ward, Stream Ecologist