Sump pump installation keeps groundwater and storm runoff out of a crawlspace by collecting it in a basin and pumping it out to daylight or a storm line before it soaks framing, insulation, or ductwork. In Portland's rain belt, a pump paired with a working vapor barrier and a check valve is the difference between a dry crawlspace in February and a moisture problem you don't find until spring.
When does a Portland house need a sump pump?
Most calls come in one of these situations:
- A crawlspace that's damp or standing with water every winter, especially in older neighborhoods (St. Johns, Sellwood, parts of Milwaukie and Oregon City) where the water table sits close to the surface from November through March.
- A house on a slope or at the bottom of a slope where storm water sheets toward the foundation instead of away from it.
- A remodel or foundation repair that exposes an existing crawlspace and shows signs of standing water, rot, or a failed or missing drainage system.
- An existing pump that's failed, alarmed, short-cycled, or run without a battery backup through a power outage.
- New construction or an addition where the site plan calls for a sump pit as part of the drainage design.
If you can smell mildew from the crawlspace access, see water marks on the vapor barrier, or notice a pump running constantly, that's worth a look before winter, not after.
How the visit goes
We start by looking at the crawlspace itself — where water is coming from, whether it's groundwater, a downspout draining under the house, a grading problem, or a failed perimeter drain. If a sump pit already exists, we check the pump, the check valve, the discharge line, and the vapor barrier before assuming the pump is the problem.
For a new install, we set a basin at the low point (or dig one), run discharge piping out to daylight or an approved storm connection, install a check valve so water doesn't drain back into the pit between cycles, and wire the pump to its own circuit. Most jobs also get a battery backup, since Portland's wet season and windstorm-related outages tend to happen at the same time — the worst moment for a pump to lose power. We test the system under load before we leave and walk you through what the alarm (if equipped) means.
What affects the price
- Whether this is a new sump pit or a replacement of an existing pump and basin
- How much drainage piping is needed to reach daylight or a storm connection, and how far that is from the pit
- Crawlspace access and clearance — some Portland foundations from the 1920s–1950s have tight, low crawlspaces that take longer to work in
- Pump type: standard pedestal or submersible, plus whether a battery backup or water-powered backup is added
- Electrical work needed to get a dedicated, properly grounded circuit to the pit
- Whether the vapor barrier needs to be repaired or replaced as part of the job
- Permit requirements, which apply to some drainage and discharge configurations depending on where the water is routed
We look at all of this on site and quote it plainly before starting.
What's specific to Portland's houses and water
Portland sits on clay-heavy soil in a lot of neighborhoods, which drains slowly and holds water against foundations through the rainy months. Add a housing stock where a large share of homes were built before modern crawlspace drainage was standard practice, and you get crawlspaces that were fine in August and wet by December. Older perimeter drains, where they exist at all, are often clogged with root intrusion or simply undersized for how much rain the West Hills and river-adjacent neighborhoods actually see in a wet year. A sump pump doesn't fix a bad perimeter drain or bad grading on its own, but it's often the fastest way to stop water from sitting under the house while those bigger issues get addressed, and sometimes it's the whole fix.
Why Sheltons Construction
We're a licensed Oregon plumbing contractor working the Portland metro, and crawlspace drainage is part of the same work we do on water heaters, drain lines, and repiping — we're already underneath these houses regularly, so we know what a wet Portland crawlspace looks like before it becomes a bigger problem. We quote the job on site, explain what we find, and don't push equipment you don't need.
What to do now
If your crawlspace is wet, your pump has failed, or you want one installed before this winter's rain, contact us and describe what you're seeing — standing water, a musty smell, an alarm going off, or just wanting it checked before the rains set in. If it's an active water emergency, see emergency plumbing. For general questions, check the FAQ.
We install and repair sump pumps and crawlspace drainage throughout Portland, Beaverton, Hillsboro, Gresham, Tigard, Tualatin, Lake Oswego, West Linn, Oregon City, Milwaukie, Happy Valley, Clackamas, Wilsonville, Troutdale, Sherwood, and Salem.
Related work we often pair with drainage jobs: drain cleaning, hydro jetting, sewer camera inspection, sewer line repair & replacement, leak detection & pipe repair, and remodel plumbing. If the crawlspace also houses your water heater, see water heater repair & installation or tankless water heaters.