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Streams Monitoring
As human activities continue to impact the environment, it becomes increasingly important to monitor the health of our streams and rivers. Monitoring stream water quality helps ensure their continued health, as well as the health of the people and wildlife who use freshwater resources.
Stream ecosystems serve many critical roles for the benefit of people, wildlife, and the environment. They help with flood control and serve as a source of drinking water. They provide opportunities for fishing, swimming, and other outdoor activities. They also provide important habitat for plants and animals, including salmon.
In the Stream and River Monitoring Program, we monitor water quality in 75 stream and river locations across the county each month. These streams range from small urban creeks to larger forested rivers and help us understand the impacts of various pollutants and human activities.
King County streams monitoring resources
Stream-level monitoring data
Browse a table or use an interactive map to see water quality monitoring data for a specific stream location.
Stream reports
See a full report, including watershed and fisheries information, for a specific stream monitoring location.
Water Quality Index for streams and rivers
Detailed water quality scores for monitoring locations throughout King County.
Download routine monitoring data
Query monitoring data by location, date range, and parameter(s) measured.
Download metals data
Query monitoring data by location, date range, and metal(s) measured.
Sediment monitoring
Use an interactive map to see sediment monitoring data for locations throughout King County.
Benthos monitoring
Use an interactive map to see benthos monitoring data for locations throughout King County.
SeaTac precipitation data
See graphs showing the accumulated SeaTac precipitation for the current water year.
Related King County programs
Major lakes monitoring
Information and photos relating to the water quality of King County's lakes.
Hydrologic Information Center
Public access to rainfall, streamflow, and other hydrologic data collected at King County gage sites.
Swimming beach monitoring
Current information about bacteria and water temperature at King County lake beaches.
Other stream and river resources
- Washington State Water Quality Standards
- Seattle Public Utilities Shape Our Water Reports
- Snohomish County Ambient Monitoring Program
- Pierce County Watershed Health Monitoring Program
- Kitsap County Water Quality Monitoring Report
- Washington State Department of Ecology Stream and River Water Quality Monitoring