Basement flooding: first steps
A flooded basement is the most common restoration call in this metro, and it's rarely just rainwater on a floor. What you do in the first hour sets how big the job gets.
Before you go down there
- Stay out of the water until you know what it is. If it came up through a floor drain or toilet, treat it as sewage and keep everyone clear. Contaminated water is a different scope and a health hazard, not a wet-dry vac job.
- Kill power to the basement if you can reach the panel from a dry spot. Outlets, the water heater, and the furnace may all be sitting in it.
- Find the source if you can. Supply line running? Shut the main. Water still rising with the rain? That's groundwater or sewer, and stopping it isn't in your hands.
Why Portland basements flood the way they do
The inner eastside sits on combined sewers: one pipe carries both sewage and storm runoff. A tunnel project finished in 2011 cut the overflows to the river, but in hard rain the system can still push sewage back into basements. If your floor drain backed up during a storm, that is usually the reason, and water that comes up through a drain is a health hazard.
Johnson Creek is the other known problem. The corridor through Lents, Powellhurst, and the Sellwood edge has flooded repeatedly over the years, and homes near the creek see it most often. West Hills and southwest Portland houses deal with slope runoff and daylight basements. On top of that, the metro gets roughly 36 inches of rain a year, concentrated October through May, so the ground is usually saturated when the next storm arrives.
What speeds the dry-out
- Photograph the waterline and the damaged contents before anything moves.
- Get standing items up: boxes and furniture wick water and turn a floor problem into a contents problem.
- Don't pull up carpet or open the walls yourself. The crew meters the materials, and the moisture map is what decides whether walls, carpet pad, and baseboard come out.
- Get the request in early. Extraction is the cheap part; the mold risk grows while the structure stays wet.
The flood cleanup page covers extraction and structural drying, and sewage backup covers what changes when the water came up through a drain.