We won’t sugar-coat it. This one is the doozy. If the leak is located at the bottom of the unit that means at least one internal seal has slipped, chipped, or flat-out deteriorated. The catch is, there are lots of these seals inside the disposal, and if one has failed it means the others are on their way. You can replace these seals with expensive, original equipment manufacturer (OEM) parts – or you can just get a new garbage disposal.
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Most seals and pipes are located beneath your kitchen sink. It is common for these pipes to be jarred when people are using that space. If the pipes are struck hard enough, they can shift and sit improperly, causing retaining bolts to loosen and seals to be shifted into awkward positions. If your leak is coming from this area, you will need to reattach and reseal these pipes. Fixing this issue may require an experienced, licensed plumber.
Another common cause for a leaking garbage disposal is the disposal flange. A leak at the very most upper area of the garbage disposal could be the garbage disposal flange which goes through the sink. A garbage disposal flange should be sealed with Plumber’s putty and then tightened from underneath the sink. If this is not tight enough or if it has managed to come loose (which can happen) then the garbage disposal will have to be taken down so the flange can be resealed and then the garbage disposal can be rehung.