Seattle residents are being warned that the city is in landslide season. According to Building Connections, the City of Seattle cautions that the risk of landslides increases during the wetter months, particularly from November 2025 through March, when heavy rainfall or melting snow can destabilize slopes.
Seattle’s Department of Construction and Inspections (SDCI) is advising property owners in vulnerable areas—around 20,000 mostly residential properties—to take precautions against landslides. Recommended measures include maintaining downspouts and drainage systems, monitoring for soil movement, and turning off irrigation systems during the off-season. Property owners are also encouraged to consult professionals before undertaking projects on hilly terrain that could be affected by water or added weight, according to Building Connections.
SDCI recommends residents visit the City of Seattle’s Emergency Management website for resources on landslide preparedness. The site offers tools such as a landslide tutorial, interactive GIS maps, a map of landslide-prone areas, and guidance on safety measures to help residents understand and manage the risks.
If a landslide threatens safety or property, the City advises residents to prioritize personal safety, evacuate the area, and call 9-1-1 for immediate emergencies. If a landslide affects a building, SDCI recommends contacting (206) 615-0808 to request a building inspector. Staying informed and taking preventative measures can help Seattle residents protect themselves and their homes during landslide season.
