French Drains & Drainage Systems in Lacey, WA

Drainage & French drains in Lacey: what to know

Lacey Chapter 14.27 adopts the City of Lacey 2022 Stormwater Design Manual, which builds on Ecology’s 2019 Stormwater Management Manual for Western Washington. The review thresholds sit in the manual’s project-threshold chapter, which we have not reached, so we total the new surface each drain adds and ask the city which requirement it triggers.

The discharge point matters more than the pipe. We send runoff to ground the parcel can take, or to a spot we ask Public Works to approve in writing, and never toward a neighbor’s frontage. The outlet is settled on paper before excavation starts, and the route is drawn on the site plan with its distance to each lot line.

Permits and rules in Lacey

Each drain’s new and replaced surface is totaled and checked against the 2,000-square-foot line that a 2024 consultant memo attributes to the manual, and the outlet goes to Public Works in writing before digging. We verify whether any run reaches the right-of-way, and we keep the totals and the reply on the job file.

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

How we approach it

Total the new and replaced surface each drain adds
Trace where roof and yard water enters the lot first
Choose a discharge the parcel can absorb or a spot we clear with the city
Settle any street-side line with Public Works before cutting

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

Questions from Lacey homeowners

Does a small Lacey yard drain fall under the 2022 stormwater manual?

The manual’s threshold chapter is one we have not read, so the text we have cannot say whether a small drain sits under it. We add up the new surface and put the question to the city in writing.

Where should a Lacey drain’s water go once it leaves the pipe?

We aim it at a patch of the parcel that soaks it up, and any target off the lot is cleared with Public Works first. A neighbor’s frontage is never the target, and the discharge is sketched on the site plan before anything is dug.

Does a Lacey drain that runs into the street need a permit?

A run that reaches into the street is trenching, which Lacey’s right-of-way application covers. Public Works approves that application before it becomes a permit, and the approved permit runs 60 days, so we schedule the cut inside that window.