You have a serious problem that most likely requires a new garbage disposal.
Sink garbage disposal leaking from bottom.
For instance if the leak is coming from the sink flange this means the seal between the sink and the disposal is broken.
This can be fixed by detaching the disposal from the sink then removing the plumber s putty then resealing the flange.
If water still runs down the side of the garbage disposal then the leakage is from the plumbers putty between the sink flange and the bottom of the sink.
Replace the gasket and re tighten the drain pipe screws.
What if the leak is from the bottom.
Turn on the water and fill up the sink a little less than half full.
We will first address a leaky garbage disposal gasket.
This seal is often exposed to frequent fluctuations in water temperature eventually causing it to break down or corrode.
Knowing the source of the leak lets you know how bad the problem is.
Leaks from the bottom of the garbage disposal often from the reset button.
The sink flange is the flat metal disk connecting your garbage disposal to your sink.
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Examine the bottom of your sink and look for any leaks.
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The most common cause is a damaged internal seal within the unit.
Leaking at the top.
A leak happening towards the top of the sink will likely appear while the sink is plugged and a leak towards the bottom of the sink will likely appear while the sink is unplugged.
If the leak is coming from the top of your garbage disposal unit the problem is probably caused by a damaged sink flange.
Plumber s putty that seals the sink flange to the garbage disposal wears or corrodes over the years.
Lift the sink flange slightly above the sink surface.
A leak at the joint of the garbage disposal and the kitchen sink is easy to repair.
Follow these quick steps to fix the garbage disposal leaking from top turn off the machine and unplug from the electric line remove the old connecting putty or the sealer from the joint.
If the bottom of the unit is leaking replace the disposal.
Take a bottle of food coloring the brighter the better and place a few drops in the sink of water.
If water is leaking from the top the cause could be a leaky gasket or a leaking flange.
Place a bag a small garbage can or a bucket underneath the sink to collect any leaking water.
As a result water makes its way through and results in a leak.