OT ConstructionConcrete & outdoor living

French Drains & Drainage Systems in Mukilteo, WA

On a sloped lot, water runs downhill, so a drain has to intercept it above the wet area and deliver it somewhere safe. We install French drains, curtain drains, and tightlines once the outlet and the water’s route are confirmed.

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French drain cross-sectionA trench wrapped in filter fabric and filled with clean drain rock around a perforated pipe, collecting water from the surrounding soil. 12345
French drain section: fabric, clean rock, perforated pipe
  1. Filter fabric keeps silt out of the rock
  2. Clean drain rock gives water an easy path
  3. Perforated pipe carries the water away
  4. Soil cover over the trench
  5. Groundwater and runoff move toward the drain

Drainage & French drains in Mukilteo: what to know

A curtain drain laid across the incline picks up seepage before it reaches the lawn or the footing. Its trench falls steadily, and a level checked at several points confirms the fall. A French drain at the lower corner gathers whatever the curtain line passes.

Roof water rides in solid pipe to its own outlet, separate from the perforated run. Discharge goes to soil with room to take it, or to a storm connection the city has approved. The flow is kept off slope faces, neighboring lots, and the road, so the fix does not move the problem downhill.

Permits and rules in Mukilteo

Any run that crosses into the public right-of-way is reviewed under Title 12, so we check the route on the survey before any trench is laid out. We ask the city which chapter applies and who holds the review. Those answers are recorded on the job file, and the quote lists them on a separate line.

Rules change and vary by parcel, so we confirm the current requirements with the city before we start.

How we approach it

  • Survey the grade and fix the lowest workable outlet
  • Lay curtain drains on a steady fall across the slope
  • Give roof water its own solid pipe and outlet
  • Clear any Title 12 review before the trench is cut

For the full process, see our Drainage Systems & French Drains page.

Questions from Mukilteo homeowners

When does a Mukilteo drain touch Title 12?

Title 12 governs the rights-of-way, with permits in chapter 12.04 and improvements in chapter 12.06. A drain that reaches public ground, or that ties into a city storm asset, is reviewed under that title before excavation.

What does Mukilteo’s grading chapter add to a drain trench?

Chapter 15.16 covers grading and excavation, so a trench cut is checked against it before digging. Its thresholds are confirmed with the city, since we did not read them in full.

What do we survey before a Mukilteo hillside drain is laid?

The lowest workable outlet, the slope above the wet area, and the path the water takes to the exit. A drain is laid only where that exit is usable.

Other work in Mukilteo

The same service nearby

Talk to us about your project

Call or email us. We’ll talk through the work and set up a time to see the site.

Call 206-483-5334
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Call 206-483-5334Get a quote