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Science, data and trends

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Environmental Data in King County, Washington

Environmental monitoring data

Swimming beach bacteria levels and water temperature
Use a regional map to look up water quality graphs and data for about 30 swimming beaches at lakes across King County.

Streams and rivers water quality monitoring data
Look up water quality data and graphs for streams and rivers including temperature, dissolved oxygen, pH, turbidity, conductivity, total suspended solids, phosphorus, nitrogen, bacteria, metals, precip, overall water quality index, and toxicity and pesticide studies.

Benthic macroinvertebrate (stream bug) monitoring
Learn why aquatic insect counts provide insight about the health of streams, and look up measures for many streams in King County, Washington. More data can be found at our Puget Sound stream benthos site (external link).

Major lakes water quality monitoring data
Lake buoy data - water column
Small lakes water quality monitoring data
Use maps to find sampling sites for graphs and data of temperature, dissolved oxygen, pH, conductivity, nitrogen, phosphorus, chlorophyll, secchi depth, fecal coliform count, and E. coli count.

Hydrologic Information Center
Look up records for over 500 sites for continuous recording stream gages on rivers and streams, continuous recording rain gages, visually checked staff and crest stage gages in wetlands, lakes and detention facilities, recording and non-recording groundwater wells, and water quality sampling.

Groundwater well data
Look up water quality sampling data and well levels using an interactive map or a form.

Flood Warning System (river gage) data
Read the current gage readings for major river systems across King County, and compare to historical records of past flood events.

Puget Sound water quality monitoring data
Download data and view graphs for Conductivity-Temperature-Depth (CTD) profiles for various mapped points and cast dates.

Some of the environmental data collected by the Science and Technical Support Section in King County is summarized and included in annual reports on the King County DNRP and Executive level web pages. Visit the KingStat DNRP Environmental Indicators website for annual information. Visit the King County Environmental Impacts of Climate Change website to read about the latest trends regarding impacts to the people and environment around you.

Related information

Related agencies

News and announcements

Jan. 26, 2015
External article, Sightline Daily
Northwest Oil Spills: The Raw Data and the Growing Risk

Nov. 18, 2014
External article, Seattle Times
Filtering rain runoff reduces its threat to salmon, study suggests

Oct. 1, 2014
External article, Yakima Herald
Proposed water quality rule tied to fish consumption

Jul. 10, 2014
Executive Constantine supports comprehensive approach to improving water quality

Jun. 30, 2014
Quick response by King County employees after Puget Sound water quality data buoy mishap

May 16, 2014
External column, Seattle Times
Protect water and health by updating state’s fish-consumption rate

Dec. 12, 2013
External article, Seattle Times
Report links extreme weather and melting of Arctic sea

Jul. 31, 2013
King County keeping an eye on Puget Sound water quality with a new monitoring buoy

May 10, 2013
External article, New York Times
Carbon Dioxide Level Passes Long-Feared Milestone

Apr. 18, 2013
Mayor, County Executive, Port announce deal for water quality improvements and new park at Smith Cove
Deal responds to neighborhood’s desire for new park space

Nov. 9, 2012
External article, West Seattle Blog
What’s in our waterway? New site dives into Puget Sound pollution

Jun. 18, 2012
Plan to control stormwater sewer overflows underscores King County’s commitment to water quality
Executive also calls for a new science-based study

Apr. 27, 2012
King County reminds boaters to steer clear of data buoys on lakes Washington, Sammamish

» News archive - environmental monitoring data