Serving Sammamish
Groundwater & Basement Water Intrusion in Sammamish, WA
Basement seepage, failed sumps, and hydrostatic pressure against the foundation are extracted and dried, and the path from the ground is identified so the loss does not repeat. Groundwater and basement seepage are extracted and dried only after the path from the soil is identified — a wall, a slab, a drain, or a failed sump. Drying the interior without stopping that path returns the same water to the same floor.
Frequently asked questions
The plateau was logged and then built on within a generation.
It was, which means the drainage was designed and installed in a short window under the standards of that period, and a great deal of it is buried lines and basins on private ground rather than public pipe. Which era a neighborhood belongs to says a good deal about what exists and what was never required.
Everything here drains into somebody's basin or pond.
It does, because the city was built with detention as the design rather than piped drainage to a river, and most of those basins sit on common ground held by associations. That decides who arranges the dredging when one silts up, and it is nearly always the residents rather than the city.
The city sits on a plateau above a large lake.
It does, several hundred feet up, which means the lake is not the hazard people assume. What matters is what happens at the plateau edge, where water perched on dense glacial ground finds daylight and the slopes move after weeks of saturation. The exposure is the rim rather than the shoreline below.
Open the Sammamish FAQ beside the housing and climate notes.