–Wet weather is approaching

Did you know that most landslides occur between the months of November and March? As rainfall continues to increase throughout the fall, the threat of landslides will continue to rise this winter.

Landslide season is upon us, so the City of Seattle is urging residents to take preventive measures to protect themselves and their property from possible landslides.

Most landslides are caused by water (e.g. rainfall, uncontrolled stormwater) or human activity that increases the weight at the top of the slope or reduces the stability at the bottom of the slope.

With 20,000 Seattle properties (mostly residential) in landslide-prone areas, the Seattle Department of Construction and Inspections (SDCI) encourages property owners to take preventive measures to protect themselves from landslides by:

Checking downspouts; making sure they are functioning/routed to a safe location

Maintaining drainage systems by clearing away leaves and debris

Inspecting sloped areas for indications of soil movement and erosion

Shutting off irrigation systems and inspecting them seasonally

Keeping fill and yard waste off slopes

Knowing when to seek professional help for hillside projects

Visit our website to understand if you’re at risk and how to be prepared. Helpful tools include:

Landslide tutorial

Interactive GIS Map

Landslide Prone Area Map

Do’s & Don’ts

If a landslide damages your property and you have an immediate concern for your safety, leave the premises and call 9-1-1. Seattle property owners with structures that may be affected or endangered by a landslide should also contact SDCI at (206) 615-0808 so that a building inspector can respond and perform an initial assessment of the structure.

Visit the USGS website to view the current conditions of the USGS rainfall threshold for landslides.