The answer to 'when to replace garbage disposal' is that you should typically replace your garbage disposal every 8-12 years, or sooner if it stops working properly. Garbage disposals are hardworking appliances that can wear out over time due to the constant use and exposure to food waste and water. Signs it's time to replace your disposal include loud noises, frequent jams, and reduced grinding power.
Replacing the disposal is generally recommended if the unit is more than 10 years old or if repair costs would be 50% or more of the cost of a new one. A new, energy-efficient disposal can also save you money on your utility bills over time.