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Public engagement - Black Diamond Sewer Upgrade Project
King County's sewer project is north of Black Diamond. Learn more about how we work with the community.
How we work with the community
Community Services is here to serve you throughout the project. We are happy to work with you. Our Community Services team will:
- Share project information
- Answer your questions
- Hear your thoughts
- Discuss concerns and reasonable solutions
- Gather community input and information
You can get updates in many ways, such as:
- Meetings with community members and groups
- Online and in-person meetings and open houses
- Newsletters and flyers
- Social media
- Email updates – sign up for email updates
For more information or to schedule a meeting, please:
- Email: BDSewerUpgrade@kingcounty.gov
- Call: Annie Plumley at 206-263-3203
Public meetings/outreach
Winter 2026 – Library Chats
Dates:
- Friday, March 13, 2026, from 11 am to 3 pm - Covington
- Friday, March 20, 2026, from 10 am to 2 pm – Black Diamond
- Monday, April 17, 2026, from 3 pm to 6 pm - Covington
- Saturday, April 25, 2026, from 12 pm to 4 pm - Black Diamond
- Saturday, May 9, 2026, from 11 am to 3 pm - Covington
- Tuesday, May 12, 2026 from 4 to 7 pm - Black Diamond
Locations:
- Black Diamond Elementary, 25314 Baker St, Black Diamond, WA 98010
- Covington Library: 27100 164th Ave SE, Covington, WA 98042
Purpose:
People told King County they want more one-on-one time with the project team. They also asked for options that were not at fairs and festivals.
To meet this need, the team set up tables at the Covington and Black Diamond libraries.
At the Library Chats, people could:
- Learn about how water flows through the sewer system.
- Review more detailed information about the existing pipe alignment.
- Review the updated Frequently Asked Questions document.
- Ask questions about the project.
- Sign up for project updates.
- Share feedback.
Materials
- Black Diamond Project Flip Book
- Frequently Asked Questions (English), also available as PDF file
- Frequently Asked Questions (Spanish)
- Frequently Asked Questions (Vietnamese)
- How Wastewater Flows Graphic
Summary:
We will post a summary of the Library Chats on the project website when all events are done.
August 31 and September 1, 2025 - Black Diamond Labor Day Festival
Time: 10 am to 4 pm
Location: Black Diamond Elementary, 25314 Baker St, Black Diamond, WA 98010
Purpose:
King County’s Black Diamond sewer upgrade team set up a booth at the Black Diamond Labor Day Festival. At the booth, people could:
- Learn why we need this project.
- Learn how wastewater service works in the area.
- See how construction may change roads and trails.
- Ask questions about the project.
- Sign up for project updates.
- Fill out our community survey.
Materials
- Survey link (open July 18 to September 17, 2025)
- Frequently asked questions
- Project alignment map
- Service area map
Promotion:
Summary:
August 23, 2025 - Maple Valley Farmers’ Market Summary
Time: 9 am to 2 pm
Location: Maple Valley Legacy Site (25719 Maple Valley Black Diamond Road SE, Maple Valley, WA 98038
Purpose:
King County’s Black Diamond sewer upgrade team set up a booth at the Maple Valley Farmers’ Market. At the booth, people could:
- Learn why we need this project.
- Learn how wastewater service works in the area.
- See how construction may change roads and trails.
- Ask questions about the project.
- Sign up for project updates.
- Fill out our community survey.
Materials
- Survey link (open July 18 to September 17, 2025)
- Frequently asked questions
- Project alignment map
- Service area map
Promotion:
Summary:
July 19 and 20, 2025 - Covington Days Festival
Time: 10 am to 6 pm
Location: 27100 169th Pl SE, Covington, WA 98042
Purpose:
King County’s Black Diamond sewer upgrade team set up a booth at the Covington Days Festival. At the booth, people could:
- Learn why we need this project.
- Learn how wastewater service works in the area.
- See how construction may change roads and trails.
- Ask questions about the project.
- Sign up for project updates.
- Fill out our community survey.
Materials
- Survey link (open July 18 to September 17, 2025)
- Frequently asked questions
- Project alignment map
- Service area map
Promotion:
Summary:
Summer 2025 - Community Value Survey
Dates: July 18 to September 17, 2025
In summer 2025, King County ran a survey to share project information and gather early input from the community. We heard from over 80 people in response to our survey.
Overall, 551 people visited the website to learn about the project. Most people that responded to the survey live nearby and travel in the project area daily. When they travel it is to run errands, commute to work/school, and for recreation.
We will use your 2025 feedback to help plan next steps. It will inform project design, traffic planning, and outreach in 2026 and beyond.
Materials
Promotion:
Summary:
Spring 2025 – School Briefings
Dates:
- March 28, 2025 – Kentlake High School
- March 28, 2025 – Cedar Heights Middle School
- April 1, 2025 – Black Diamond Elementary School
- April 3, 2025 – Grass Lake Elementary School
- April 14, 2025 – Sawyer Woods Elementary School
- April 25, 2025 – Kent School District
Purpose:
In Spring 2025, the Black Diamond sewer upgrade team met with leaders from five nearby schools. We met with staff from the Kent school district as well.
During the meetings, we shared an overview of the project. We also asked about:
- School pick-up and drop-off times
- Bus times and routes
- Events we could attend
- Languages spoken
- How people get to and from each school
- How to share information with staff and families
Materials
October 12 and 26, 2024 - Maple Valley Farmers’ Market Summary
Time: 9 am to 2 pm
Location: Maple Valley Legacy Site (25719 Maple Valley Black Diamond Road SE, Maple Valley, WA 98038
Purpose:
King County’s Black Diamond sewer upgrade team set up a booth at the Maple Valley Farmers’ Market. At the booth, people could:
- Learn why we need this project.
- Learn how wastewater service works in the area.
- See how construction may change roads and trails.
- Ask questions about the project.
- Sign up for project updates.
- Fill out our community survey.
Materials
Summary: