Surface Water Management

Keeping People Safe and Waters Healthy

Snohomish County provides essential services to safeguard your health and our environment through its stormwater utility, Surface Water Management (SWM), part of the Department of Conservation & Natural Resources. You can see us in your community as we help people fix drainage problems, clean up water pollution and improve stormwater systems. These services are funded by a utility charge paid by people in unincorporated Snohomish County. 

Water Quality Information
Drainage & Road Flooding Information
Salmon & Marine Habitat Information
River Flooding Information
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Thomas' Eddy Restoration Project Receives $5.85 Million Grant 

December 2022 - We are excited to announce that Snohomish County will receive a $5.85M construction grant for the Thomas’ Eddy Hydraulic Reconnection project from the National Fish and Wildlife Foundation’s National Coastal Resilience Fund, in partnership with the National Oceanic and Atmospheric Administration (NOAA).

Learn more on the  Thomas' Eddy project website.

Annual Flood Safety Guide

This guide provides information on a wide range of flood-related topics, such as how to protect your home before a flood, what to do if flooding occurs, and steps to take to recover after a flood.

Sign up to receive SWM news

Stay connected! Sign up to get the latest SWM news sent directly to your inbox. Get quarterly updates about:

Visit the SWM News page to read past newsletters and see a collection of stories about SWM's work in the community.

2022 SWM Highlights Report

The 2022 SWM Highlights report shows how we’re putting local dollars to work for county residents. You can access the 10-page report to read more about projects, stories and other SWM accomplishments in 2022 here.

2022 SWM Highlights Report Cover Opens in new window


 You can find a link to the previous year's report here.

SWM Capital Improvement Program (CIP) 2023-2028

Snohomish County adopts a six-year Capital Improvement Program (CIP) as part of the budget process. The CIP is a component of the Capital Facilities Plan (CFP) but is a physically separate document that fulfills two separate, but related, responsibilities of the County under state and local law. See a list of SWM's approved projects here:


SWM 6 Year CIP 2023-2028

Snohomish County's Department of Conservation and Natural Resources (CNR) has adopted CNR Departmental Rule 2023-01, related to compliance with Drainage and Land Disturbing Activity (LDA) codes for SWM Projects. After reviewing public comment, the CNR Director approved the new rule, effective March 31, 2023.


Public Notice -- Final Action of CNR Rule Adoption

CNR Rule 2023-01