Home & Appliances

How Long Does a Garbage Disposal Last?

Garbage disposals last 8–15 years, averaging 12 years. The leading cause of premature failure is grinding inappropriate food items.

8–15 years

Quick Facts

Average Lifespan

8–15 years

Replacement Cost

$200–$400 (installed)

Source

NAHB

Overview

NAHB data shows garbage disposals lasting about 12 years on average, with a range of 8–15 years depending on use habits and motor quality. The leading cause of early failure is grinding foods the unit is not designed for: fibrous vegetables like celery and artichokes wrap around the motor shaft; hard items like bones and fruit pits dull the impellers; grease and oil solidify and clog the drain. A well-maintained disposal on a household that uses it appropriately can easily reach 15 years. Replacement is typically a straightforward DIY project or low-cost plumber service call.

Signs It Is Time to Replace

Persistent humming without any grinding motion — motor is seized or impeller is jammed
Leaking from the bottom — internal seals have failed (not repairable)
Frequent need to press the reset button on the bottom of the unit
Slow draining even after clearing a jam — impeller wear or drain line issue
Grinding or clanking sounds from hard debris that persists after clearing
Persistent odors that don't resolve after cleaning
Age over 12 years with any declining performance

How to Make It Last Longer

Always run cold water before, during, and 30 seconds after grinding
Never grind fibrous vegetables (celery, asparagus, artichoke), coffee grounds, pasta, rice, or grease
Clean monthly by grinding ice cubes and rock salt to scour impellers
Freshen with citrus peels — orange or lemon peels eliminate odors naturally
Use the reset button when the unit hums but doesn't grind — it's a jammed impeller, not motor failure

What Affects Replacement Cost

Motor size — 1/3 HP (basic) to 1 HP (premium) — larger motors last longer under heavy use
Brand quality — InSinkErator and Waste King are the most reliable consumer brands
Whether a licensed plumber is needed for installation (adds $100–$150)

When to Replace

Replace your garbage disposal when it leaks from the bottom (internal seal failure — not repairable), when the motor makes no sound at all despite resetting, or when the unit is over 12 years old and needs any significant service. Garbage disposal replacement is one of the most cost-effective home repairs — a quality 3/4 HP unit costs $120–$200 and installation is $50–$150. Total replacement cost is $200–$400, making repair vs. replace math simple.

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Pro Tip

The reset button on the bottom of your disposal is an often-overlooked first fix. If the unit hums but doesn't grind, the impeller is jammed — press the reset button (small red button, bottom center), then use the hex key socket in the center of the bottom to manually free the jam before trying to run it again. This resolves 80% of "my disposal stopped working" calls.

Frequently Asked Questions

Why does my garbage disposal hum but not turn?+

The impeller is jammed. Press the red reset button on the bottom of the unit, then insert a 1/4-inch hex key into the center socket on the bottom and turn it back and forth to free the jam. This fixes most humming-but-not-turning issues without a repair call.