Surface Water Management

Snohomish County's Surface Water Management Division provides a variety of programs and services for reducing road and property flooding and preserving and improving the health of Snohomish County's water resources and natural systems. We focus on four areas of service:

  • Clean water in rivers, streams and lakes;
  • Habitat for fish and aquatic wildlife;
  • River flooding and erosion;
  • Stormwater drainage systems.

We work in partnership with the residents of Snohomish County. You can find us responding to water-quality problems and complaints, monitoring river levels during flood season, maintaining drainage systems, managing habitat improvement projects and more.

SWM Highlights

  1. Port Susan

    The Port Susan Marine Stewardship Area is a haven for wildlife and a mecca for people to escape back into nature located on the Salish Sea in Snohomish County of Washington State.

Draft 2017 Stormwater Management Program Plan Available for Review

The draft 2017 National Pollutant Discharge Elimination System (NPDES) Stormwater Management Program Plan is available for review. This draft plan describes programs the county will implement in 2017 to comply with the NPDES municipal stormwater permit, which is a part of the federal Clean Water Act. Find out more about the NPDES permit, what the county does to meet its requirements, and how you can comment on these programs by visiting our NPDES page.

Lake Serene

On April 5, 2016 SWM met with the Lake Serene Community to report our findings on the lake outlet condition and to discuss and get feedback on alternative solutions to the lake outfall. The links below contain the following from the meeting: the proposed alternative graphics, alternative summary slide, cost share strategy slide, power point presentation, and the comment card. We welcome your review and comments if you were unable to attend the meeting. Please submit comments by April 21, 2016.

Alternative Graphics

Lake Serene Project Sketch Private Alternative
Lake Serene Project Sketch Cost Share Alternative

Alternative Summary Slide

Recap of Alternatives

Cost Share Strategy Slide

Cost Share Strategy

Complete Power Point


Lake Serene Outfall Alternatives

Comment Card

Lake Serene Comment Card