Water quality assessment and monitoring study
King County published a comprehensive look at water quality in Elliott Bay, Lake Union, the Lake Washington Ship Canal, and the Duwamish Estuary in 2017.
Read the Key Findings.
Search for documents (Science Section Document Search) or follow the links on this page (click the +).
View a video about the key findings:
The study’s 12 documents examine water quality past, present, and future:
Using results to reduce combined sewer overflows
The results will:
- Make sure future pollution control projects are well-planned and timed to improve water quality.
- Inform King County’s Protecting Our Waters Program, including the 2018 CSO Long Term Control Plan Update. This program is working to reduce “combined sewer overflows,” or CSOs, where sewage mixed with stormwater overflows to water bodies on very rainy days.
- Establish baseline conditions King County can use to monitor how conditions change after we build CSO projects.
Sharing what we learn
Many people work hard to improve water quality. King County partners with others to achieve our region’s goals.
The City of Seattle has a similar program for Protecting Seattle’s Waterways . The two agencies continue to work together to get the most out of these water quality investments and coordinating with each other on studies like this one.
The Water Quality Assessment and Monitoring Study can support many more water quality efforts, including these:
- Stormwater management (King County) or Stormwater management (Seattle)
- Contaminated sediment remediation
- Land use and source control
- Boat paint controls
- Creosote-treated pilings removal
- Ballard Locks Upgrade
- Methods for lowering surface water temperatures
- Actions individuals can take to protect water quality
If you have questions or comments about the Water Quality Assessment and Monitoring Study, please contact Erika Peterson.