# Atmospheric River Season Is Coming: Protect Your Home This Fall 2026 | Seattle Water Damage Restoration Blog > Fall atmospheric rivers drive flooding across Greater Seattle. Here URL: https://seattlewaterdamagerestoration.co/blog/atmospheric-river-flood-prep-seattle-fall-2026/ Last-Modified: 2026-09-08 Author: Daniel Hargrove ![Atmospheric river storm system over Seattle](/images/featured/atmospheric-river-storm-over-seattle-skyline-with-.webp) Every fall, the Pacific Northwest’s atmospheric river season starts. Long, narrow corridors of moisture from the tropical Pacific dump rainfall on Western Washington at rates that overwhelm storm drains, swell rivers, and push water into basements, crawl spaces, and ground-floor rooms across Greater Seattle. If you live here, the question isn’t whether atmospheric rivers will hit this fall — it’s how much damage they’ll do to your home if you don’t prepare now. As a Seattle water damage restoration [/ →](/) crew that works storm season every year, here’s the checklist we wish every homeowner ran through in September. ## What atmospheric rivers actually do to your home Heavy rain alone is rarely the problem. What an atmospheric river adds is duration and intensity. A typical PNW storm drops 1-2 inches over a day; an atmospheric river can drop 4-8 inches in 24 hours, sustained for 48-72 hours. That overwhelms three systems on most homes: 1. **Surface drainage** — gutters overflow, downspouts back up, water pools against foundations 2. **Storm sewers** — city drains can’t keep up, water backs up through street drains and combined sewers 3. **Groundwater** — saturated soils raise the water table, pushing water through crawl spaces and basement walls The result: basement flooding, crawl space saturation, sewer backups, and roof leaks where shingles or flashing were already weakened. ![Homeowner clearing gutters before atmospheric river season](/images/content/homeowner-clearing-gutters-and-downspouts-before-a.webp) ## The September checklist Do these things before the first big storm hits. Most are free or under $100 in materials. ### Clear gutters and downspouts This is the single most impactful thing you can do. Clogged gutters overflow during heavy rain, and overflow lands right at your foundation. Within hours, that water finds its way into the basement or crawl space. Clear all leaves and debris. Run a hose through downspouts to confirm they flow freely. Extend downspouts at least 6 feet from the foundation — splash blocks alone usually aren’t enough during an atmospheric river. ### Test the sump pump If you have a sump pump in your basement or crawl space, test it now — not during the storm. Pour 5 gallons of water into the sump pit and confirm: - The float switch trips - The pump runs - Water actually leaves the pit - The discharge line is clear and water exits where it’s supposed to If anything fails, get it fixed this month. Sump pumps fail at the worst possible time, and replacement during a storm is hard and expensive. ### Inspect crawl space access If your crawl space is soil-exposed (no vapor barrier or a damaged one), now is the time to plan for protection. At minimum, walk the perimeter and look for: - Grading sloping toward the house (water flows there) - Vegetation blocking foundation vents - Visible water staining on the foundation from previous storms If you’ve had standing water in past atmospheric river seasons, that’s a sign your crawl space needs proper drainage and possibly encapsulation — our crawl space cleanup [/crawl-space-cleanup/ →](/crawl-space-cleanup/) crews handle exactly this. Don’t wait for it to happen again. ### Clear the street drain in front of your house This sounds minor. It’s not. Storm drains that are blocked by leaves, branches, or debris are the #1 cause of street flooding that backs up into driveways and through gutter overflow. Clear the drain grate in front of your house. Your neighbors will thank you, and your driveway will too. ### Check the roof and attic Walk around the house and look up. Are there shingles lifted or missing? Is the flashing around chimneys and vents intact? Inside the attic, look for any signs of previous water staining on the rafters. If anything looks suspicious, get it checked before the storm — not after. ![Sump pump inspection before storm season](/images/content/sump-pump-inspection-in-basement-during-pre-storm-.webp) ### Move valuables off basement floors Even with all prep done, a severe atmospheric river can put water in your basement. Photo albums, important documents, electronics, and seasonal storage should be at least 6 inches off the floor. Plastic shelving or pallets work well. ## During an active atmospheric river When the storm hits, monitor your home actively, especially overnight: - Check basement and crawl space access twice a day - Listen for the sump pump cycling more than usual - Walk the perimeter once daylight permits — watch for pooling water - Don’t open or close basement floor drains (you can’t fix a backup once it’s started) If you see water entering, call us immediately. Water spreads by the hour, and mold can begin within 24-48 hours. The faster we extract, the more we can save. ## Coverage check before the storm Now is also the time to check your insurance. Most homeowners policies cover sudden, accidental water damage from storms (roof leaks, sudden plumbing failures), but commonly exclude: - Flood damage (water entering from outside — requires separate flood insurance) - Sewer backups (separate sewer-backup rider needed, often $50-$150/year) - Sump pump failures (separate rider in some cases) If you’re not sure what your policy covers, call your agent now. Adding a sewer-backup rider before storm season is one of the cheapest insurance buys you can make in the PNW. ## When to call us We respond 24/7 across King and Snohomish County, with 60-minute arrival promises. If you see: - Standing water of any depth in basement or crawl space - Water entering through walls or windows - Sewer backup through floor drains or fixtures - Significant roof leaks during a storm — call us immediately. Live local dispatcher answers the phone. We bill insurance directly so most clients pay $0 out of pocket beyond their deductible. **Storm damage already happening?** — Call 24/7 dispatch [tel:+14250000000 →](tel:+14250000000) Daniel Hargrove Lead Restoration Technician Daniel leads field operations at Seattle Water Damage Restoration. For more than a decade he's overseen emergency water, mold, and sewage projects across King and Snohomish County. ✓ IICRC Certified, WRT, AMRT ## Need help with this? Talk to a real local dispatcher 24/7. Certified technicians on-site in 60 minutes — direct insurance billing. Call (425) 000-0000 [tel:+14250000000 →](tel:+14250000000) See related service [/crawl-space-cleanup/ →](/crawl-space-cleanup/)