Why your washer is leaking from the bottom
A washer leaking from the bottom almost always traces to one of four things: a loose or cracked hose, a worn pump seal, a torn door boot on front-loaders, or too much soap. The good news is that most of these are cheap and fixable in an afternoon.
The tricky part isn't the fix. It's finding the actual source, because water runs along the base of the machine and pools where the floor slopes, not where the leak starts.
So before you buy a single part, you need to watch the machine run. Which stage leaks (fill, drain, or spin) and where the water first shows up will point you at the right part almost every time.
Most of these repairs land $20–$100 in parts if you do them yourself. A pro visit runs $150–$500. The one exception is a cracked tub or transmission seal, which can cost more than the washer is worth.
The most common culprits, ranked
Start with hoses, because they're the most common and the easiest to check. Rubber fill hoses go brittle around 5 to 7 years and split near the brass fittings. Drain hoses crack at the elbow or back out of the standpipe.
If the hoses are solid, move to the door boot on front-loaders. This is the rubber gasket sealing the door to the drum, and it's a magnet for coins, underwire, and zipper teeth that slice it open. A torn boot leaks straight down the front.
Next is the drain pump. Its shaft seal dries out over the years and weeps during the drain cycle, and the plastic housing cracks if something jams the impeller. A pump that only leaks while running is almost always the seal.
Internal hoses and clamps come after that. They loosen or develop pinholes and drip from the center of the machine mid-cycle. You can often feel a fine spray from a pinhole with your hand.
Overflows from too much detergent look exactly like a hardware leak, so don't skip this. HE washers are picky, and a heavy soap dose creates suds that climb over the tub.
A cracked outer tub or failed transmission seal is the worst case. It's rare, expensive, and usually shows up with loud banging on spin. On an older machine, this is where replacement wins.