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Science, data and trends

The best decisions are well-informed

Science, data and trends

Environmental indicators and performance measures
Look up the current condition of the environment in King County, find out how we're performing, learn what we've accomplished in past years, and learn how you can help.

Environmental monitoring data
Look up gage readings for rivers and streams, rainfall measurements, and water quality samples for creeks, rivers, lakes, and Puget Sound including recreational areas such as swimming beaches.

King County growth report
Status and trend on development in King County including population and demographics.

Environmental lab services
Look up services provided by King County's accredited environmantal laboratory, which every year works on over 150 projects, analyzes 15,000 samples, and produces close to 400,000 data points for use in environmental studies and decision-making.

Natural resource reference maps
Look up maps, aerial photos, and interactive maps depicting natural features, conditions and points of interest in the Seattle-King County region.

Greenhouse gas emissions inventories
Find reports of greenhouse gas emissions for the King County community and King County government.

Impacts of Climate Change in King County
Read about trends of impacts related to climate change on people and the environment around you.

Environmental feature and facility data for King County

Features (2010)

  • King County area: 2,131 square miles
  • King County population 1,916,441 people
  • 14th most populated county in the U.S.
  • 760 lakes and reservoirs
  • 975 wetlands
  • 38.15 inches average annual participation
  • 6 major river systems
  • 3,000 miles of streams
  • 100 miles of marine coastline
  • 850,000 acres of forestlands

Facilities (as of 2010)

  • 500 flood facilities and revetments totaling more than 119 miles of riverbank
  • 26,000 acres of parks and natural lands
  • 175 miles of regional trails
  • 353 miles of underground wastewater pipes and tunnels
  • 8 solid waste transfer stations and 2 rural drop boxes 920 acre Cedar Hills Regional Landfill
  • 2 major regional wastewater treatment plants with
  • 1 under construction, 2 smaller treatment plants
  • 2,369 commercial/residential stormwater control facilities 700 low impact development sites

SciFYI Newsletter, by Water and Land Resources Division Science Section
Quarterly newsletter promotes the use and understanding of our scientific data and information, and to share knowledge about the value and benefits of Environmental Sciences.

Related information

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News and announcements

Dec. 3, 2014
External opinion, Seattle Times
Guest: Why the EPA’s plan is the best way forward for the Duwamish River

Dec. 2, 2014
External article, Seattle Times
Mammoth $342 million cleanup ahead for fouled Duwamish River

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

Apr. 23, 2012
External article, Seattle Times
Wash.'s fish diet spurs look at water quality


Please offer suggestions and report errors in the King County Data and Trends portal to Fred Bentler, webmaster.