A soggy Seattle yard is rarely bad luck; it's water with nowhere to go. Between our nine-month wet season, slow-draining glacial till, and lots that channel roof and slope runoff toward the house, standing water and mushy lawns are the predictable result. Our french drain installation Seattle WA work addresses the root cause by giving water an engineered path off the property instead of letting it pool where it does damage.
A French drain, done right, is a gravel-filled trench with perforated pipe that intercepts subsurface and surface water and carries it to a safe discharge point. Paired with catch basins that capture surface pooling and swales that shape the flow, it turns a chronically wet yard into usable ground and keeps water away from foundations, crawlspaces, and hardscapes. The design has to match your soil and grade, which is where local experience earns its keep.
We evaluate and install drainage solutions across Seattle and the greater King and Snohomish county area, from a single problem downspout or low spot to a comprehensive system that finally solves years of water trouble.
Signs You Have a Yard Drainage Problem
- The lawn stays soggy or squishy for days after it rains
- Standing water pools in the same low spots every wet season
- Water collects against the foundation or near a crawlspace
- Downspouts dump right beside the house instead of draining away
- Moss and bare patches spread in chronically wet areas
- Runoff from a slope keeps saturating the lower part of the yard
What Our Drainage Solutions Include
French Drain Installation
Gravel-filled trenches with perforated pipe that intercept subsurface and surface water and route it to a safe discharge point away from the house.
Catch Basins
Surface inlets placed at low spots and collection points to capture pooling water and feed it into the drainage system before it saturates the yard.
Downspout Drainage Lines
Piped connections that carry roof runoff well away from the foundation, ending the common problem of downspouts dumping water right at the house.
Swales & Grading
Shaped channels and regrading that guide surface water along an intended path, working with drains to manage flow across the whole property.
Slope Water Management
Interception systems for runoff coming off a slope, catching and redirecting it before it saturates lower ground or reaches the structure.
Discharge Planning
Thoughtful routing to an appropriate discharge point so the water you collect actually leaves the property rather than resurfacing somewhere new.
Our Drainage Installation Process
- 1
Drainage Evaluation
We assess where water comes from, where it pools, your soil and grade, and where it can safely discharge, so the system solves the real hydrology instead of guessing.
- 2
System Design
We design the right mix of French drains, catch basins, downspout lines, and swales for your site, sized to handle PNW rainfall and matched to your soil's drainage.
- 3
Trenching & Excavation
We excavate trenches to proper depth and slope, the pitch is critical, since water needs consistent fall to move reliably toward the discharge point.
- 4
Pipe, Gravel & Basin Installation
Perforated pipe, drainage gravel, filter fabric, and catch basins go in to spec, then we connect the system and confirm flow toward the intended outlet.
- 5
Backfill & Restoration
We backfill, restore the surface, and clean up, testing that water moves as designed so the yard drains properly the next time it rains.
Talk to a Florentino Landscaping specialist
Get a free, no-pressure estimate from a licensed, insured Seattle crew. Same-day and 24/7 emergency service available.
Drainage Solution Pricing in Seattle
Drainage systems are priced by the length and depth of trenching, the components involved, and site conditions like soil and access. A single downspout line is a modest job; a comprehensive system with multiple drains, basins, and swales is a larger investment. We evaluate the property and provide an itemized plan so the scope and cost are clear before work begins.
- Total length and depth of trenching required
- Number of French drain runs, catch basins, and downspout lines
- Soil conditions and how difficult excavation will be
- Distance to a suitable discharge point
- Grade and whether regrading or swales are part of the plan
- Site access for equipment and material delivery
- Surface restoration over the completed system
Drainage is one of the most valuable and most underrated investments a Seattle property owner can make, because water damage is expensive and chronic wetness quietly degrades everything from lawns to foundations. Florentino Landscaping has designed and installed drainage systems across the region since 2016 as a family-owned, licensed and insured Washington company that understands our soils and rainfall firsthand.
We stand behind the systems we install and want your yard dry and usable for good. Call (323) 606-0255 for a drainage evaluation and a solution built for how water actually moves on your property.
French Drain & Yard Drainage Solutions — Frequently Asked Questions
Usually a combination of our long wet season, slow-draining glacial till or clay soil, and runoff, from downspouts, slopes, or neighbors, with nowhere to go. Water pools because the site lacks a path to move it away. A properly designed drainage system gives it that path.
It's a sloped, gravel-filled trench with perforated pipe that collects subsurface and surface water and carries it to a safe discharge point. The consistent pitch is what makes water flow reliably. We often pair it with catch basins for surface pooling and swales to shape the overall flow.
Fall and early spring are ideal, so the system is in place before the wet season peaks and the ground is workable. If you're dealing with active flooding, we can assess right away and schedule the permanent installation for the right window.
Yes, that's one of the most important things it does. Redirecting downspouts and installing drains and grading to move water away from the foundation protects against the crawlspace moisture and structural issues that standing water causes. It's a common and worthwhile fix here.
Built right, a French drain lasts many years and needs little attention, because the filter fabric wrapped around the gravel and perforated pipe is what keeps soil and fine silt from working in and clogging it. The systems that fail early are usually the ones installed without fabric or without proper pitch. It's worth keeping catch basins and any outlet points clear of leaves and debris, especially heading into our wet season, so water always has a clean path out.
Related reading
Solving Saturated PNW Lawns: French Drains, Catch Basins, and Swale Design
A perpetually soggy lawn is a drainage problem with a solution. Here is how French drains, catch basins, and swales each work and when to combine them.
GuideNavigating Seattle Glacial Till & Hardpan Soils: Planting and Drainage Strategies
Seattle's glacial till and hardpan defeat plants and drainage alike. Here are the strategies that let landscaping thrive in our stubborn native soils.