Holiday closure Monday May 28: Most county offices will be closed in observance of Memorial Day.

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts
Puget Sound shoreline next to the West Point Treatment Plant, Seattle

Side sewer problem: roots

Side sewer (excavated) completely blocked by roots
A segment of excavated side sewer which is completely blocked by roots

To prevent side (lateral) sewer problems, know your pipe – where it is located, how old it is and any known tree root problems. Maintain your side sewer by not flushing garbage or rinsing grease down drains, and by planting trees and shrubs with low root damage potential.

Back to maintaining your side sewer.