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Most 1/3 to 1/2-horsepower sump pumps use 1,300 to 2,900 watts to start up. Then, they use 800 to 1,050 watts to continue running until the reservoir is empty.

To find the right sump pump size, dig out your 18-inch-wide reservoir and observe the water accumulation on a rainy day. Start with an empty reservoir and watch the rainfall for one full minute. Measure the depth of the rainwater in inches and multiply by 60 to find the total number of gallons that build up. Multiply that number by 1.5 for a bit of wiggle room. If it’s more than 35 gallons per minute, get a 3/4-horsepower unit. Otherwise, 1/3 to 1/2-horsepower models will work.

If your sump pump is making a lot of noise, it may be time for a replacement. Other signs that your sump pump may be damaged include sump pump odors, a spike in your utility bills, or excessive pump vibrations.

You don’t necessarily need a plumber to install a sump pump. You may want to hire a handyperson or a specialized sump pump repair pro to handle the replacement or installation.

Not every basement needs a sump pump. You only need a sump pump if your basement floods during light to heavy rain. If you notice basement condensation instead, you might need basic waterproofing services.