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King County briefed on high cost of sewer connections as thousands of aging septic systems sit in urban areas

5507129 · July 17, 2025
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

Public Health — Seattle & King County staff and representatives from Valley View Sewer District briefed the King County Board of Health on July 17 about the scale and cost of converting aging septic systems to public sewer, particularly inside the county's urban growth area.

Public Health — Seattle & King County staff and representatives from Valley View Sewer District briefed the King County Board of Health on July 17 about the scale and cost of converting aging septic systems to public sewer, particularly inside the county's urban growth area. "Almost half of our on-site sewage systems in King County are within the urban growth area," Megan Jackson, who leads the on-site sewage program, told the board.

Why it matters: County staff said many urban on-site sewage systems (OSS) are older than their design life and about 40% are in areas with high social vulnerability. Without action, an estimated 30,000 urban OSS could fail over the next 20 years, causing sewage backups and public-health risks,…

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