Why am I writing a review about my beloved garbage disposal? Why am I referring to it as my "beloved" garbage disposal? I replaced a different garbage disposal from Costco; it had lasted a few years before giving up the ghost (the metal teeth within had basically corroded and broken off). Even before it met its untimely end, it had been loud and took a long time to grind things up--despite it being 1-1/4 horsepower!
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.