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Drainage & French Drains in Beaverton, OR

Drainage and French drains in Beaverton, OR. Beaverton Excavation Co. installs French drains, catch basins, and footing drains to stop flooding and foundation water. Free estimates.

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Licensed & insured in Oregon Free on-site estimates Local Washington County crew Wet-season ready

Drainage work in Beaverton is what keeps winter rain from becoming a foundation, crawl space, or yard problem. Beaverton Excavation Co. installs French drains, catch basins, swales, curtain drains, footing drains, and downspout tie-ins that collect water and move it to a legal outfall. Around here, drainage is not an add-on; it is often the reason an excavation project succeeds.

Beaverton's name comes from beaver-dam country, and that history still makes sense when you see how the low ground holds water. Heavy silty clay slows infiltration, the seasonal water table climbs from October through May, and slopes above town can send runoff downhill in a hurry. We solve saturated yards, wet basements, seepage, and standing water by identifying the source first and then giving it a real path out.

French drain trench with drain rock and perforated pipe along a house in Beaverton, OR — A French drain going in — perforated pipe bedded in drain rock and wrapped in fabric — Beaverton, OR.

Our Beaverton Drainage Services

Beaverton Excavation Co. builds drainage systems for homes and light commercial sites where water needs a reliable path away. Depending on the source of the water, we install:

French drains — perforated pipe in a rock-filled, fabric-wrapped trench that collects and carries groundwater away.
Catch basins and area drains — grated inlets that capture surface water from low spots and hardscapes.
Downspout and gutter tie-ins — piping roof water underground to a proper outfall instead of dumping it at the foundation.
Swales and surface grading — shaping the ground to carry runoff where it should go.
Foundation and footing drains — perimeter drainage to keep water out of crawl spaces and basements.
Curtain drains and yard drainage — intercepting water before it reaches the wet part of your property.

Why Drainage Is the Job to Get Right in Beaverton

Water is what wrecks foundations, and Beaverton has more than one way to deliver it. The city was named for beaver dams, and low areas near Beaverton Creek, Fanno Creek, and Johnson Creek still behave like wet ground when the rain settles in. At the same time, hillside lots on Cooper Mountain, Sexton Mountain, and the West Slope shed water downslope quickly. We diagnose whether the problem is runoff, roof water, groundwater, or a rising water table, then build the system that matches the source.

Built for clay and a high water table

Willamette Valley drainage has to be designed around winter groundwater and clay that accepts water slowly. Our French drains are set in clean drain rock, wrapped with filter fabric to keep clay out of the system, and carried to daylight or a drywell sized for local rainfall. The goal is a working drain, not a shallow token trench that clogs after two wet seasons.

Beaverton Rain Is a Number, Not a Guess

Beaverton receives roughly 36 inches of rain across about 161 rainy days, with the load concentrated in the wet months. November and December each bring more than five inches, and problems usually show themselves between November and March. A marine west-coast climate on the Tualatin Valley floor asks drainage to handle sustained winter volume, so French drains, outfalls, and drywells are sized for Beaverton rainfall rather than a generic summer-weather detail.

Where the water goes matters as much as how we collect it. Low ground along Fanno Creek, Beaverton Creek, and Johnson Creek can stay saturated for months, while the slopes above town can send concentrated runoff into yards below. We plan a legal outfall that actually carries water away from the foundation — daylight where allowed, a drywell where it makes sense, or an approved storm connection — and we size the system for a wet Willamette Valley winter, not a summer shower.

How Much Does Drainage Installation Cost in Beaverton, OR?

Most Beaverton residential drainage systems price out around $1,800 to $5,500. French drains are commonly quoted per linear foot at about $25 to $60 per foot installed, with depth, clay conditions, access, and distance to the outfall setting the final number. A single catch basin or downspout tie-in can be only a few hundred dollars, while multi-run whole-property systems cost more. The Washington County ranges below are a budgeting guide.

Drainage scope	Typical size	Typical Beaverton cost
French drain	per linear foot	$25 – $60
French drain system	100 – 150 ft	$1,800 – $5,500
Catch basin / area drain	each	$350 – $1,200
Downspout tie-in	per downspout	$200 – $600
Foundation / footing drain	per project	$3,000 – $9,000

Ranges are typical for the Beaverton / Washington County area and include excavation, pipe, rock, fabric, and backfill. Depth, distance to outfall, rock, and access move the number. We give a firm, itemized quote after a free site visit — no obligation.

Permits, Outfalls, and Code

Beaverton drainage work is only acceptable if the discharge point is legal. Water cannot simply be piped onto a neighbor's property or out to the street without meeting the rules. Some systems need a plumbing or site permit, and public storm connections fall under Clean Water Services requirements. Beaverton Excavation Co. plans the outfall — daylight, drywell, or approved storm connection — pulls required permits, and includes erosion control so the repair does not create a downstream issue.

What Working With Us Looks Like

1. Free on-site diagnosis

We inspect the property when the issue is visible, trace the source of the water, and provide an itemized written price for the fix.

2. Design & permits

The system and outfall are sized for the soil and water source, with any required permit handled before installation.

3. Dig, bed, and pipe

Our crew excavates to grade, places perforated pipe in fabric-wrapped clean rock, and installs the basins or tie-ins the design calls for.

4. Backfill & restore

After the drain is tested and covered, we compact the backfill and restore the surface so the yard dries out without looking torn apart.

Frequently Asked Questions

How much does a French drain cost in Beaverton, OR?

Installed French drains in Beaverton usually cost $25 to $60 per linear foot, depending on depth, access, clay conditions, and the distance to a legal outfall. A 100- to 150-foot system commonly totals $1,800 to $5,500. A catch basin or downspout tie-in can cost less, while full foundation drainage is usually higher. We price the system after diagnosing the water.

How do I know if I need a French drain or something else?

The right fix depends on the source. Groundwater and soggy soil point toward a French drain or curtain drain; a single ponding low spot may need a catch basin; roof water usually needs downspout piping; crawl-space seepage may call for footing drainage. We trace the water first so you are not paying for a drain that solves the wrong problem.

Why does my Beaverton yard flood every winter?

Beaverton combines long wet seasons, silty clay, low former-wetland areas, and hillside runoff from places like Cooper Mountain and the West Slope. Water either cannot soak in fast enough or arrives faster than the yard can shed it. The fix is a planned route out: swales, French drains, catch basins, downspout tie-ins, or footing drains sized for local rainfall.

Do you need a permit to install drainage in Beaverton?

Sometimes. Drainage work may need a plumbing or site permit depending on the system, and public storm connections fall under Clean Water Services requirements. The discharge point has to be legal; it cannot simply dump onto a neighbor or into the street. We design the outfall, check permit needs, and handle the required paperwork.

Will a French drain clog over time?

A cheap or unwrapped drain can clog when clay migrates into the rock and pipe. We bed perforated pipe in clean drain rock, wrap the trench with filter fabric, hold grade to the outfall, and avoid mixing native clay into the drain zone. Built that way, a French drain can work for many years with little attention.

Get Your Free Beaverton Excavation Estimate

Send over the basics of the job and we will visit the property, walk the ground with you, and price the scope in writing — no pressure and no obligation. Call, text, or use the form; we reply the same business day.

Prefer to talk?

Call or text to reach our team directly. During business hours we pick up when we can, and every message gets a return call.

(971) 397-9361

Hours: Mon–Sat, 7am–6pm