Washington's rainy season is iconic. From October through May, the Pacific Northwest receives significant rainfall. While the rain sustains our forests and fills our reservoirs, it also tests every drainage system on your property. A property that's fine in dry months can become a nightmare once the rains arrive if it's not properly prepared. The time to prepare is now—before the heavy rain starts.
Taylor Creek helps homeowners across King County and Pierce County prepare their properties for the rainy season. We assess drainage, grade, and install solutions that prevent water damage. Here's your complete rainy season preparation guide.
Why Rainy Season Prep Matters
Washington homeowners face unique challenges: wet soil, soggy yards, basement moisture, and foundation water damage. These aren't theoretical problems—they cause thousands of dollars in damage every year. Prevention is far cheaper than repair. A few thousand dollars spent on drainage and grading in late summer prevents $20,000+ in foundation damage by spring.
Rainy Season Prep Checklist
1. Clean Gutters and Downspouts (Priority: CRITICAL)
Clogged gutters are the #1 cause of water damage. When leaves and debris block gutters, water overflows directly next to your foundation. This causes foundation settling, basement leaks, and landscape damage. Clean gutters cost $150–$400 and take 2–3 hours. Do this immediately. Your gutters should channel water 5–10 feet away from your foundation via extended downspouts.
2. Assess Property Grading (Priority: HIGH)
Grading is the slope of ground around your home. Proper grading slopes 1% away from the foundation for at least 6 feet. This means a 1-inch drop every 100 feet. Poor grading allows water to pool against your foundation. If your property is flat or slopes toward your home, regrading is essential. Cost: $0.50–$2/sq ft for grading work.
3. Install or Repair Drainage Systems (Priority: HIGH)
If you have a history of wet basements, standing water, or soggy yards, a French drain or curtain drain is necessary. Install these before rain season starts. Trying to dig trenches in mud and rain is difficult and expensive. Lead time for drainage work is 2–3 weeks in fall. Schedule now.
4. Clear Storm Drains Near Your Property (Priority: MEDIUM)
Street storm drains near your driveway or property line can become clogged with leaves and debris. This prevents water from draining away. Contact your city to request clearing, or help clear the area yourself if accessible. A clear storm drain dramatically improves neighborhood drainage.
5. Inspect Foundation and Basement (Priority: MEDIUM)
Before winter rain, inspect your basement for cracks, moisture, or previous water entry. Mark any problem areas. After heavy rain, check the basement again to see if water appears. This tells you whether your property has an active water problem needing professional attention.
6. Trim Trees and Clear Branches (Priority: MEDIUM)
Remove branches hanging over your roof. Broken branches can damage gutters and roof. Trim back trees overhanging gutters to minimize leaf accumulation. Remove dead trees that could fall during winter storms. Clear tree wells and ensure water can drain from tree areas.
7. Check Sump Pumps and Back-Up Power (Priority: HIGH)
If you have a sump pump, test it by pouring water into the sump pit. It should activate and pump water away. Verify the discharge goes at least 10 feet from your foundation. If you have a battery-backup sump pump, test the battery. A dead sump pump during rain is disaster. Battery cost: $200–$400. Peace of mind: priceless.
8. Protect HVAC and Electrical Panels (Priority: MEDIUM)
Ensure your HVAC units, electrical panels, and water heaters are elevated above potential flood level. If they're near basement entry areas or yards prone to standing water, move them or install flood protection. Cost varies; consult a contractor.
9. Seal Basement Cracks and Gaps (Priority: MEDIUM)
Small cracks in foundation walls can weep water during heavy rain. Seal accessible cracks with hydraulic cement or concrete sealant ($20–$100). Large cracks need professional structural assessment. Don't ignore foundation cracks—they worsen over time.
10. Ensure Lot Drainage (Priority: HIGH)
Walk your property after a rain and observe where water collects. Puddles that persist for hours indicate poor drainage. These areas need grading, fill, or drainage installation. Identify low spots and standing water now so you can plan solutions.
Pro Tip: Late summer (August-September) is the ideal time for drainage work. Contractors have availability, ground is dry (easier to excavate), and work finishes before heavy October rains begin. Waiting until October or November means muddy conditions, contractor delays, and rushed work.
Common Rainy Season Problems and Solutions
Standing Water in Yard
Problem: Your yard stays soggy for days after rain.
Solution: Regrade the area with a slight slope, or install a curtain drain upslope to intercept water before it reaches the wet area. Cost: $1,000–$3,000 for drain, $500–$1,500 for regrading.
Basement Moisture or Seeping Water
Problem: Moisture on basement walls or actual water entering during heavy rain.
Solution: Grade the exterior away from foundation, install exterior French drain, and ensure proper downspout drainage away from foundation. Interior options (interior drain, sump pump) are fallback solutions if exterior fixes don't work. Cost: $2,000–$6,000 for comprehensive solutions.
Wet Crawl Space
Problem: Your crawl space becomes damp or wet in winter.
Solution: Install a crawl space vapor barrier, ensure proper foundation ventilation, and install a crawl space drain or sump pump if needed. Cost: $1,500–$3,500.
Timeline for Rainy Season Prep
- August: Assess drainage needs, schedule professional site visit, plan work.
- September: Complete gutter cleaning, grading, and drainage installation. Finish all excavation work before October rains.
- October–May: Monitor property during rain. Document any water issues that develop.
The Bottom Line
Preparing your property for Washington's rainy season is smart homeownership. Start with gutter cleaning immediately. Follow up with a professional drainage assessment. Invest in grading and drainage work in late summer before heavy rain arrives. These steps prevent costly water damage and ensure your property stays dry and safe through the wet season.
Taylor Creek provides free rainy season property assessments. We evaluate drainage, grading, foundation conditions, and recommend solutions tailored to your property. Call 425-465-5586 to schedule your assessment today.