French Drains & Drainage Systems in Edgewood, WA

Drainage & French drains in Edgewood: what to know

Larger properties mean longer drainage runs, and that changes the design. A French drain needs consistent slope along its whole length and an outlet at the end that can take the flow. On a bigger lot, finding that outlet is often the hardest part, since water has to go somewhere that’s legal, stable, and not on a neighbor.

Edgewood’s till soils keep rain near the surface, and the water follows the top of the till downhill until it surfaces. A curtain drain placed uphill of the problem area can intercept it before it reaches your yard or foundation. If you have a septic drain field, a well, a seasonal stream, or a wetland nearby, we plan around them, since buffers and setbacks may apply.

Permits and rules in Edgewood

A drain by itself often needs no building permit. The outlet is what draws scrutiny: you can’t point it at a neighbor’s lot or the sanitary sewer. Tying into a city storm system or working in the right-of-way takes city approval, and moving a large volume of soil can bring stormwater or grading rules into play. We confirm the legal outlet with the City of Edgewood before any digging starts.

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

How we approach it

Walk the property to trace where the water enters and where it can leave
Locate utilities, septic fields, and wells before excavation
Trench to grade, line with fabric, and bed the pipe in clean rock
Add cleanouts so the system can be flushed and inspected

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

Questions from Edgewood homeowners

How far can a French drain run in Edgewood?

As far as the slope and the outlet allow. Longer runs need consistent grade and cleanouts. The outlet is the real limiting factor, not the length.

Can a French drain go near my septic field in Edgewood?

Drains have to stay clear of drain fields and must never send water into one. We locate your system before we design anything.

Will a curtain drain stop my yard from flooding in Edgewood?

If groundwater coming from uphill is the cause, a curtain drain can intercept most of it. If surface runoff is the cause, we may add catch basins or regrade.