The Best Sump Pumps

A sump pump is the least interesting appliance you own and the one with the highest stakes. It sits in a hole in the floor, does nothing for months, and then has to run for forty straight hours during the storm that also takes out your power. What you're really buying is margin: enough capacity to stay ahead of the water, and enough build quality to survive the cycling. Everything else — cord length, discharge size, the shape of the float — matters only because it affects those two things.

Here's the honest part. No sump pump moves what the box says it moves. Those gallon-per-hour numbers are measured at zero lift, and your pump has to push water up eight to fifteen feet of pipe before it reaches daylight. Expect something closer to half the advertised output at a realistic head height. And none of these pumps runs without electricity. The storms that overwhelm your drainage are the same storms that drop power lines, so a primary pump on its own leaves your worst case uncovered.

So buy for the water you actually get. A basement that goes damp after a hard rain needs something very different from one that pumps nonstop through a wet stretch. Sizing up isn't free either — bigger pumps cost more, run in shorter harder bursts, and need more room in the pit. Match the pump to the pit, then plan for the outage separately. We think that the Zoeller M53 Mighty-mate is the best sump pump for most people, and that the Wayne CDU980E is the one to buy if your pit refills about as fast as it empties.

This guide is for homeowners replacing a primary sump pump in an existing pit, or buying a spare before they need one. If your basement has a pit, a discharge line and a dedicated outlet already, any of these picks is a job you can do in an afternoon with basic tools. If you're putting in a sump system from scratch — cutting concrete, setting a liner, routing new discharge — that's contractor work in most places, and you should sort out permits before you buy anything.

You should not buy on horsepower alone. Most homes with moderate groundwater are well served by a 1/3 HP cast iron pump, and going bigger without a reason just means shorter, harder cycles. We've stuck to submersible pumps here, since they run cooler and quieter than pedestal models and belong in any finished or occupied basement. We don't cover full battery-backup systems, water-powered backups or aftermarket Wi-Fi monitors, though we think most flood-prone homes should own some form of outage protection alongside whatever they pick here.

Output at head height: we treated advertised gallon-per-hour figures as a ceiling and asked what's left after eight to fifteen feet of vertical lift, because that's the number your basement actually gets. Housing material: cast iron sheds motor heat where thermoplastic traps it, so anything meant to run as a primary pump had to be metal. Switch reliability: switches fail before motors do, and we favored designs that suit a standard basin without snagging or sticking. Noise: a pump cycling under a bedroom is a quality-of-life problem, so one-piece castings and sealed motors earned credit. Fit and installation: discharge size, cord length and physical footprint decide whether a swap is an afternoon or a weekend, and we weighted that heavily.

If you want commercial-grade build and a 2-inch discharge: The Zoeller 267-0006 M267-25 2-inch Sump Pump with ($515.13) — The Zoeller 267-0006 M267-25 is the heavy end of this lineup — a 1/2-horsepower cast iron pump with a 2-inch discharge port and a 25-foot cord, built for high-cycle duty in deep or awkward pits. Landlords, owners of vacation properties, and anyone who has already lived through a finished-basement flood are the people who'll find it worth the reach. It's also the pump plumbers reach for in ejector pits. What you give up is money and simplicity: it's the most expensive unit here by a wide margin, the 2-inch discharge means your existing 1-1/2-inch plumbing needs adapting, and a handful of owners report the casting degrading around the float housing well before the pump should be done. For a standard suburban basement, the M53 is the more sensible buy.

If you want a backup pump for outages: The Basement Watchdog BWSP 1730 Gallons Per Hour ($583.07) — The Basement Watchdog BWSP is a secondary pump designed to take over when your primary quits or the power goes down, rated at 1,730 gallons per hour and sold here as a pack of two. That pairing is genuinely practical if you've got more than one pit, or if you want a ready spare sitting on the shelf for the night your primary dies mid-storm. It won't match a 3/4 HP primary on output, and it isn't supposed to — its job is buying you hours, not keeping up with a flood. Two caveats: you'll need to buy a compatible battery separately for it to do anything during an outage, and there's little published detail or owner feedback on this particular listing, so confirm what's in the box before you commit.

This is what our research turned up in this lineup, not a survey of every sump pump on the market. Plenty of capable pumps from other brands aren't here. The one below is worth understanding mostly so you know why it isn't a pick.

The Pentair Flotec FPSE3200A Thermoplastic Sewage Pump 4/10 ($195.40) — The Pentair Flotec FPSE3200A is a sewage ejector pump rather than a groundwater sump pump, and that distinction is the whole story. Its 4/10-horsepower motor moves up to 5,250 gallons per hour and passes 2-inch solids, and it's certified to SSPMA standards, which is real independent verification that a lot of competitors skip. But it's thermoplastic at a price above the cast iron pumps here, and the solids-handling ability that justifies the cost does nothing for a pit that only sees groundwater. Owner feedback on this listing is thin and sharply split, which makes it hard to judge how it holds up. Choose it if you have a below-grade bathroom, a basement laundry, or a floor drain handling more than clean water — and skip it otherwise.

Before you order, measure your pit's depth and diameter and check whether your discharge line is 1-1/2 or 2 inch. Most submersibles want at least an 11-inch basin, and a tethered float needs room to swing without hitting the wall. The pump should have its own grounded outlet on a dedicated circuit, never an extension cord and never a GFCI that nuisance-trips. Replace the check valve while the pit is open — they're cheap and they fail quietly, letting water run back down after every cycle. Once a year, pour a few buckets into the pit and confirm the pump starts, clears the water and shuts off cleanly. Rinse the intake screen while you're there. If the pump sounds different than it used to, that's your warning.

For this guide:

• We read the manufacturer specifications and listing documentation for every pump in this lineup, then compared horsepower, rated output, discharge size, housing material and switch type side by side.
• We worked through published recommendations from home and plumbing publications to see which models get named repeatedly and why.
• We read through owner feedback for each product, paying particular attention to recurring reports of switch failures, early motor deaths and pumps that owners replaced with the identical model.
• We read owner reviews on every listing, weighted toward the critical ones, because that is where the recurring failures show up.
• We have a systematic way of automatically fetching the latest prices, so the numbers on this page stay current.
• This is a research-focused guide, so the team may not own every product listed — though we often do own the top winners, which gives us extra context for the recommendations.
• We don't accept free products, and the retailer commission never changes which product we recommend.