A collection pit (sump)
We set a basin at the lowest point of your basement or crawl space, where incoming groundwater naturally collects.
Bay Area Sump Pump Installation · Licensed · 13+ Years
Sump Pump Installation in the San Francisco Bay Area
Bay Area winters and high water tables push groundwater under your home. A properly installed sump pump collects it and pumps it away — keeping your basement or crawl space dry and mold-free.
Free inspectionLicensed (CSLB #1022608)Basement & crawl-space drainage13+ years experience
Free on-site estimate · No pressure · We come to you
Why It Matters
Keep Groundwater Out
of Your Basement & Crawl Space
The Bay Area's wet winters, clay soils, and high water tables mean groundwater collects under a lot of homes. Once water pools in a basement or crawl space, it doesn't just sit there — it soaks framing and insulation, feeds mold and wood rot, and invites pests, and the damp air rises into the rest of the house.
A sump pump is the fix: it sits at the low point, collects the water that flows in, and pumps it away from your foundation before it can do damage. It's often paired with a french drain to channel water to the pump — and when water has already damaged the insulation below, with crawl space insulation removal to clear it out.
- Keeps basements and crawl spaces dry
- Prevents flooding and water damage
- Protects framing from rot and mold
- Pumps groundwater away from your foundation
- Reduces damp, musty air in the home
- Pairs with french drains for full drainage
How It Works
How a Sump Pump
Keeps Your Home Dry
A sump pump system is simple, but every part matters. Here's what a proper installation includes and does.
The pump
As water rises in the pit, a float switch triggers the pump — which lifts the water out and sends it away from the house.
A discharge line
The water is carried through a discharge line to a safe spot well away from the foundation, so it can't seep back in.
A check valve
A check valve keeps pumped water from flowing back down into the pit, so the pump isn't fighting the same water twice.
Backup options
Since storms and outages often come together, we can add a battery backup so the pump keeps running when the power doesn't.
Works with french drains
Paired with a french drain, the drain channels water to the pit and the pump clears it — a complete drainage system.
Do You Need One?
Signs Your Home
Needs a Sump Pump
Water problems under the house tend to show up as smells and damage before you ever see standing water. Watch for these.
Standing water or flooding
Water pooling in the basement or crawl space — especially after rain — is the clearest sign you need drainage and a pump.
Damp, musty odors
A persistent musty smell rising into the house usually means moisture is sitting under it and feeding mold.
Water stains or efflorescence
Stains, dark marks, or white mineral crust on foundation walls show water has been coming in.
Mold or wood rot
Mold on framing or soft, rotting wood under the house points to a moisture problem a sump pump helps solve.
A low-lying or high-water-table lot
Homes at the bottom of a slope or over a high water table collect groundwater and benefit most from a pump.
A history of flooding
If your basement or crawl space has flooded before, it will again without drainage — a sump pump is the safeguard.
How We Work
Our Sump Pump Installation Process
A sump pump only protects your home if it's placed and plumbed right. Here's how we handle every install.
Free inspection
We inspect your basement or crawl space, find where water collects and how it's getting in, and confirm the right drainage solution.
Set the sump pit
We dig and set the sump basin at the low point where groundwater naturally flows, so the pump catches it at the source.
Install pump & discharge
We install the pump, run the discharge line to a safe outlet away from the foundation, and fit a check valve so water can't flow back.
Add drainage if needed
Where water needs help reaching the pit, we integrate a french drain — and can add a battery backup for storm outages.
Test & walkthrough
We test the pump and float switch, confirm it clears water properly, clean up, and show you how it works and what to check.
Free inspectionLicensed (CSLB #1022608)Drainage done right
Why Attic Pros
The Bay Area's Trusted
Drainage & Sump Pump Team
For over 13 years, Bay Area homeowners and businesses have trusted us to keep their basements and crawl spaces dry — because we solve the whole water problem, not just drop in a pump, and stand behind the work.
- Licensed contractor (CSLB Lic. #1022608)
- SPCB-registered for pest-related work (Co. Reg. #9901)
- Diamond Certified & Angi Super Service Award winner
- Independently reviewed — verified Google ratings
- Free, no-obligation on-site inspection
- Local team with 13+ years under Bay Area homes
Real Customers, Real Results
Trusted by Bay Area Homeowners
4.8
★★★★★
Based on 1,900+ verified Google reviews — trusted for sump pumps, drainage & home services across the Bay Area
Google Review
★★★★★
Tom Best came to our house to give us an estimate on new insulation. He was on time, very thorough and provided a detailed very reasonable estimate within an hour of his visit. What more could you want?
B Kellar
Google Review
★★★★★
Samim great service my attic was left very clean meticulous. I am so happy with the work that him and his team did great service. I recommend them highly. I would give them a 10 if I could.
Darlene Galindo
Google Review
★★★★★
David from Attic Pros was professional, knowledgeable, and thorough. He clearly explained the extent of our rodent problem in the attic and showed us detailed photos and videos so we could fully understand the damage. He took the time to explain exactly what the rodents had caused and walked us through how the repairs would be completed. David was friendly, patient, and easy to talk to, making the entire process much less stressful. We really appreciated his honesty and professionalism.
Carmen Plascencia
Google Review
★★★★★
We cannot say enough good things about Attic Pros! From start to finish, it was a great experience. We initially called for attic, crawl space and duct cleaning, as well as rodent proofing (sealing vents, etc). Samim came out and did a very thorough evaluation, showing us dozens of photos of areas that needed attention. He also recommended new insulation, which we hadn’t considered and told us our dryer vent needed repair. It took us a few weeks to schedule, during which time Samim followed up periodically, never pushy, always answering our questions and providing more info. His professionalism and knowledge was a huge reason why we chose to work with Attic Pros. On the day of the job, Osman and crew cleaned the attic and crawl space and installed new installation, while Douglas repaired the dryer vent and Kevin cleaned the ducts. They did an amazing job sealing off the work areas and keeping the house clean, despite it being very messy and grueling work! They spent about 3 hours vacuuming the attic and another half a day sweeping the crawl space by hand. Their attention to detail was above and beyond what we expected. We were sooo impressed! And Samim’s recommendations were spot on - our dryer is much more efficient now and we noticed the house was cooler within hours of the new insulation being installed (it was the height of summer). We’d use and recommend them again and again!
Courtney Jung
Google Review
★★★★★
We had a great experience with Attic Pros Oakland during our estimate. Tom was friendly, professional, and very accommodating with our questions and schedule. He took the time to inspect both attic areas thoroughly, explain what he found, and walk us through the recommended scope in a clear, no-pressure way. We appreciated how organized and respectful he was in our home, as well as the detailed estimate that helped us understand the work being proposed. Based on our experience so far, we would definitely recommend Attic Pros Oakland to anyone looking for attic cleaning, insulation, air sealing, or rodent-proofing services.
pooja paliwal
Google Review
★★★★★
Had a crawlspace inspection done by Tom. Very friendly and professional. Gave a detailed overview of the condition and quoted a reasonable price for the fixes. Highly recommend!
Subhan Altaf
QUESTIONS, ANSWERED
Frequently Asked Questions
Straight answers to the questions people actually ask about sump pumps — when you need one, how they work, and backup power. Still unsure? Our team is happy to help.
Still have questions?
Talk to our team — we're here to help.
(800) 543-0382If your basement or crawl space takes on water — or your home sits over a high water table or at the bottom of a slope — then yes, a sump pump is the reliable way to keep it dry. Between wet winters and clay soils, groundwater is a real issue here, and standing water under a home leads to mold, rot, and pests if it isn't pumped out.
Both. Sump pumps are just as important in crawl spaces as basements — a damp crawl space feeds mold and rot and sends humid air up into the house. We install them in whichever low point collects the water.
Water flows into a pit (the sump) set at the low point of the space. As it fills, a float switch turns the pump on, and the pump lifts the water out through a discharge line to a spot well away from your foundation. A check valve keeps that water from draining back in.
That's exactly when you need it most, which is why we can add a battery backup. It keeps the pump running through an outage so a storm that knocks out power doesn't also flood your home.
Yes — they're a natural pair. A french drain channels groundwater to the sump pit, and the pump clears it away. For homes with a real water problem, installing both gives you a complete drainage system rather than a partial fix.
A quality sump pump typically lasts several years, and a little maintenance helps — keeping the pit clear of debris, testing the float switch, and checking the discharge line. We'll show you what to check and when at the walkthrough.
Most residential sump pump installations are completed in a single visit. Timing depends on the space, whether a french drain is added, and how the discharge line has to run. We'll give you a clear timeline with your estimate.
Usually groundwater from rain and a high water table, sometimes made worse by poor grading, downspouts draining toward the house, or plumbing leaks. Part of our inspection is finding the source, so the pump and drainage actually solve the problem.
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Serving the Greater Bay Area & Sacramento Area
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Tell us what you're seeing under your home — water, damp, or musty air — and we'll inspect the drainage, recommend the right sump pump system, and give you a clear, no-pressure estimate.